Adapter patches

(tests)

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/nativegen/IrisChunkGeneratorHeightCacheTest.java

@@ -14,6 +14,7 @@ import net.minecraft.SharedConstants;
 import net.minecraft.server.Bootstrap;
 import net.minecraft.world.level.LevelHeightAccessor;
 import net.minecraft.world.level.levelgen.Heightmap;
+import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Rule;
 import org.junit.Test;
@@ -45,6 +46,11 @@ public final class IrisChunkGeneratorHeightCacheTest {
         NativeBlockTags.bindHeightmapFixtures();
     }
 
+    @AfterClass
+    public static void restoreBlockTags() {
+        NativeBlockTags.restoreTags();
+    }
+
     @Test
     public void repeatedNativeHeightUsesLiveHeightQueriesAcrossRuntimeChanges() throws Exception {
         Fixture fixture = fixture();

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/nativegen/NativeTransitionColumnTest.java

@@ -20,6 +20,7 @@ import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.RotatedPillarBlock;
 import net.minecraft.world.level.block.LiquidBlock;
 import net.minecraft.world.level.levelgen.Heightmap;
+import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Rule;
 import org.junit.Test;
@@ -46,6 +47,11 @@ public final class NativeTransitionColumnTest {
         NativeBlockTags.bindHeightmapFixtures();
     }
 
+    @AfterClass
+    public static void restoreBlockTags() {
+        NativeBlockTags.restoreTags();
+    }
+
     @Test
     public void customKeysUseCarrierForNativeColumnsAndHeightmaps() {
         String key = "itemsadder:rocks/ruby_ore";

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/nativegen/v26_3_R1/NativeBlockTags.java

@@ -1,21 +1,30 @@
 package art.arcane.iris.nativegen.v26_3_R1;
 
 import net.minecraft.core.Holder;
+import net.minecraft.core.HolderSet;
 import net.minecraft.core.registries.BuiltInRegistries;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.tags.BlockTags;
 import net.minecraft.tags.TagLoader;
+import net.minecraft.tags.TagKey;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.Blocks;
 
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
 public final class NativeBlockTags {
+    private static Map<TagKey<Block>, List<Holder<Block>>> originalTags;
+
     private NativeBlockTags() {
     }
 
     public static void bindHeightmapFixtures() {
+        originalTags = new HashMap<>();
+        for (HolderSet.Named<Block> tag : BuiltInRegistries.BLOCK.getTags().toList()) {
+            originalTags.put(tag.key(), tag.stream().toList());
+        }
         List<Holder<Block>> solid = List.of(Blocks.STONE.builtInRegistryHolder(),
                 Blocks.OAK_LOG.builtInRegistryHolder(), Blocks.SPRUCE_LOG.builtInRegistryHolder());
         List<Holder<Block>> canopy = List.of(Blocks.STONE.builtInRegistryHolder(),
@@ -25,4 +34,12 @@ public final class NativeBlockTags {
                 BlockTags.BLOCKS_MOTION_IN_HEIGHTMAP, canopy,
                 BlockTags.BLOCKS_MOTION_IN_HEIGHTMAP_NO_LEAVES, solid))).apply();
     }
+
+    public static void restoreTags() {
+        if (originalTags == null) {
+            return;
+        }
+        BuiltInRegistries.BLOCK.prepareTagReload(new TagLoader.LoadResult<>(Registries.BLOCK, originalTags)).apply();
+        originalTags = null;
+    }
 }

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/platform/bukkit/nms/v26_3_R1/WorldgenTerrainHeightmapsTest.java

@@ -34,6 +34,7 @@ import net.minecraft.world.level.levelgen.structure.pieces.PiecesContainer;
 import net.minecraft.world.level.levelgen.structure.structures.IglooPieces;
 import net.minecraft.world.level.levelgen.structure.structures.SwampHutPiece;
 import net.minecraft.world.level.levelgen.structure.structures.SwampHutStructure;
+import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
@@ -68,6 +69,11 @@ public class WorldgenTerrainHeightmapsTest {
         NativeBlockTags.bindHeightmapFixtures();
     }
 
+    @AfterClass
+    public static void restoreBlockTags() {
+        NativeBlockTags.restoreTags();
+    }
+
     @Test
     public void authoringHeightmapsReadPlacedObjectsAndFluidsWithoutTerrainResolvers() {
         ProtoChunk chunk = terrainChunk(new ChunkPos(0, 0));

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/BareMobSpawnHistoryTest.java

@@ -13,6 +13,7 @@ import com.google.gson.JsonParser;
 import org.bukkit.Bukkit;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
+import org.junit.ClassRule;
 import org.junit.Test;
 
 import java.io.File;
@@ -26,6 +27,9 @@ import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertThrows;
 
 public final class BareMobSpawnHistoryTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     private static final String LEGACY_RENDERER_IDENTITY = "bukkit-v26_3_R1-generated-registry-json-v1";
     private static final String NATURAL_MOB_SPAWNS = "minecraft:gameplay/natural_mob_spawns";
     private static final GenerationRegistryContract.PhysicalResourceKey INSTALLED =

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/HeadlessChunkGeneratorTest.java

@@ -29,6 +29,7 @@ import net.minecraft.world.level.levelgen.structure.StructureStart;
 import net.minecraft.world.level.levelgen.structure.templatesystem.StructureTemplateManager;
 import net.minecraft.world.level.storage.LevelStorageSource;
 import org.junit.Rule;
+import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
 import org.bukkit.craftbukkit.generator.CustomChunkGenerator;
@@ -49,6 +50,9 @@ import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 
 public class HeadlessChunkGeneratorTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     @Rule
     public TemporaryFolder temporary = new TemporaryFolder();
 

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/HeadlessChunkLightingTest.java

@@ -31,6 +31,7 @@ import net.minecraft.world.level.levelgen.structure.templatesystem.StructureTemp
 import net.minecraft.world.level.storage.LevelStorageSource;
 import org.bukkit.Bukkit;
 import org.junit.Rule;
+import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
 
@@ -48,6 +49,9 @@ import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.assertTrue;
 
 public final class HeadlessChunkLightingTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     @Rule
     public TemporaryFolder temporary = new TemporaryFolder();
 

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/HeadlessChunkSerializationTest.java

@@ -38,6 +38,7 @@ import net.minecraft.world.ticks.ScheduledTick;
 import org.bukkit.NamespacedKey;
 import org.bukkit.persistence.PersistentDataType;
 import org.junit.Rule;
+import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
 
@@ -54,6 +55,9 @@ import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
 public class HeadlessChunkSerializationTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     @Rule
     public TemporaryFolder temporary = new TemporaryFolder();
 

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/HeadlessNativeBootstrapTest.java

@@ -9,6 +9,7 @@ import net.minecraft.world.item.Items;
 
 import java.util.Map;
 import net.minecraft.world.level.block.Blocks;
+import org.junit.ClassRule;
 import org.junit.Test;
 import org.bukkit.Bukkit;
 
@@ -18,6 +19,9 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
 public final class HeadlessNativeBootstrapTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     @Test
     public void bindsNativeItemComponentsWithoutStartingServer() throws Exception {
         HeadlessNativeBootstrap.bindComponents(HeadlessNativeTestRegistries.get());

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/HeadlessNativeRegistriesTest.java

@@ -7,12 +7,16 @@ import net.minecraft.resources.Identifier;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.world.level.biome.Biome;
 import net.minecraft.world.level.levelgen.structure.Structure;
+import org.junit.ClassRule;
 import org.junit.Test;
 
 
 import static org.junit.Assert.assertTrue;
 
 public final class HeadlessNativeRegistriesTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     @Test
     public void nativeStructureBiomeTagsUseTheLoadedBiomeHolders() throws Exception {
         RegistryAccess registries = HeadlessNativeTestRegistries.get();

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/HeadlessNativeRegistryTest.java

@@ -4,6 +4,7 @@ import art.arcane.volmlib.nativelib.minecraft26_2.modded.NativeRegistryAccess;
 import net.minecraft.core.registries.Registries;
 import org.bukkit.Bukkit;
 import org.junit.BeforeClass;
+import org.junit.ClassRule;
 import org.junit.Test;
 
 import java.util.Map;
@@ -17,6 +18,9 @@ import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertThrows;
 
 public final class HeadlessNativeRegistryTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     @BeforeClass
     public static void bootstrap() {
         HeadlessNativeBootstrap.initialize();

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/HeadlessNativeTileTest.java

@@ -11,6 +11,7 @@ import art.arcane.volmlib.nativelib.minecraft26_2.modded.NativeTileReader;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.data.registries.VanillaRegistries;
 import org.junit.BeforeClass;
+import org.junit.ClassRule;
 import org.junit.Test;
 
 import java.io.ByteArrayInputStream;
@@ -23,6 +24,9 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertThrows;
 
 public final class HeadlessNativeTileTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     @BeforeClass
     public static void bootstrap() {
         HeadlessNativeBootstrap.initialize();

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/HeadlessRegionTerrainTest.java

@@ -17,6 +17,7 @@ import org.bukkit.Bukkit;
 import org.bukkit.NamespacedKey;
 import org.bukkit.persistence.PersistentDataType;
 import org.junit.Rule;
+import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
 import org.spigotmc.SpigotWorldConfig;
@@ -36,6 +37,9 @@ import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
 
 public final class HeadlessRegionTerrainTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     @Rule
     public TemporaryFolder temporary = new TemporaryFolder();
 

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/NativeRegionTerrainWriterTest.java

@@ -24,6 +24,7 @@ import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.chunk.storage.RegionFile;
 import net.minecraft.world.level.chunk.storage.RegionStorageInfo;
 import org.junit.BeforeClass;
+import org.junit.ClassRule;
 import org.junit.Test;
 
 import java.io.DataInputStream;
@@ -38,6 +39,9 @@ import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.assertTrue;
 
 public final class NativeRegionTerrainWriterTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     @BeforeClass
     public static void bootstrap() {
         SharedConstants.tryDetectVersion();

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/OfflineNativeFeatureFeasibilityTest.java

@@ -26,6 +26,7 @@ import net.minecraft.world.level.material.Fluids;
 import org.bukkit.Bukkit;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
+import org.junit.ClassRule;
 import org.junit.Test;
 
 import java.util.ArrayList;
@@ -40,6 +41,9 @@ import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.assertTrue;
 
 public final class OfflineNativeFeatureFeasibilityTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     private static HeadlessNativeRegistries loaded;
     private static RegistryAccess registries;
     private static DimensionType dimension;

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/OfflineRegionPublicationTest.java

@@ -1,6 +1,7 @@
 package art.arcane.iris.probe;
 
 import org.junit.Rule;
+import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
 import org.mockito.MockedStatic;
@@ -22,6 +23,9 @@ import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.mockStatic;
 
 public final class OfflineRegionPublicationTest {
+    @ClassRule
+    public static final PaperRegistryIsolation registryIsolation = new PaperRegistryIsolation();
+
     @Rule
     public TemporaryFolder temporary = new TemporaryFolder();
 

adapters/bukkit/nms/v26_3_R1/src/test/java/art/arcane/iris/probe/PaperRegistryIsolation.java

@@ -0,0 +1,37 @@
+package art.arcane.iris.probe;
+
+import io.papermc.paper.registry.PaperRegistryAccess;
+import org.junit.rules.TestRule;
+import org.junit.runner.Description;
+import org.junit.runners.model.Statement;
+
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.Map;
+
+public final class PaperRegistryIsolation implements TestRule {
+    @Override
+    public Statement apply(Statement base, Description description) {
+        return new Statement() {
+            @Override
+            public void evaluate() throws Throwable {
+                Map<Object, Object> registries = registries();
+                Map<Object, Object> previous = new HashMap<>(registries);
+                registries.clear();
+                try {
+                    base.evaluate();
+                } finally {
+                    registries.clear();
+                    registries.putAll(previous);
+                }
+            }
+        };
+    }
+
+    @SuppressWarnings("unchecked")
+    private static Map<Object, Object> registries() throws ReflectiveOperationException {
+        Field field = PaperRegistryAccess.class.getDeclaredField("registries");
+        field.setAccessible(true);
+        return (Map<Object, Object>) field.get(PaperRegistryAccess.instance());
+    }
+}

build.gradle

@@ -96,7 +96,7 @@ String forgeArtifactName = irisArtifactName('Forge', "${minecraftVersion}+${load
 String neoForgeArtifactName = irisArtifactName('NeoForge', "${minecraftVersion}+${loaderDisplayVersion(neoForgeVersion)}")
 Map<String, String> runtimeDownloadRelocations = (Map<String, String>) ext.runtimeDownloadRelocations
 List<String> runtimeDownloadedPrefixes = (List<String>) ext.runtimeDownloadedPrefixes
-File pluginOutDirectory = layout.projectDirectory.dir('../PluginOuts').asFile
+File pluginOutDirectory = file(providers.gradleProperty('pluginOutDirectory').getOrElse('../PluginOuts'))
 File legacyBukkitJar = layout.buildDirectory.file("libs/Iris-${project.version}.jar").get().asFile
 File bukkitArtifact = layout.buildDirectory.file("libs/${bukkitArtifactName}").get().asFile
 File consumerBukkitArtifact = layout.buildDirectory.file("consumer/${bukkitArtifactName}").get().asFile
@@ -327,6 +327,9 @@ if (localVolmLibCheckout != null) {
 // moves. Without a local checkout the Exec tasks always run and the nested build decides what is stale.
 Closure<Void> declareVolmLibInputs = { Exec task ->
     task.inputs.property('volmLibStamp', volmLibStamp)
+    String nativeBillow = providers.gradleProperty('includeNativeBillow').getOrElse('false')
+    task.inputs.property('includeNativeBillow', nativeBillow)
+    task.environment('ORG_GRADLE_PROJECT_includeNativeBillow', nativeBillow)
     if (localVolmLibCheckout == null) {
         task.outputs.upToDateWhen { false }
     }
@@ -781,9 +784,20 @@ tasks.register('irisDev', Copy) {
     dependsOn(':core:javadocJar')
 }
 
+int defaultTestForks = Math.min(8, Math.max(1, Runtime.runtime.availableProcessors().intdiv(2)))
+int testForks = Math.max(1, Integer.parseInt(providers.gradleProperty('testForks')
+    .getOrElse(String.valueOf(defaultTestForks))))
+
 allprojects {
     apply plugin: 'java'
 
+    tasks.withType(Test).configureEach {
+        int moduleForks = project.path.startsWith(':adapters:bukkit:') ? Math.min(2, testForks)
+            : project.path == ':probe' ? Math.min(4, testForks) : testForks
+        maxParallelForks = Math.min(gradle.startParameter.maxWorkerCount, moduleForks)
+        jvmArgs('-XX:ParallelGCThreads=2', '-XX:ConcGCThreads=1', '-XX:CICompilerCount=2')
+    }
+
     java {
         toolchain {
             languageVersion = JavaLanguageVersion.of(25)
@@ -979,9 +993,6 @@ project(':adapters:bukkit:nms:v26_3_R1') {
     }
     sourceSets.test.compileClasspath += sourceSets.offline.output
     sourceSets.test.runtimeClasspath += sourceSets.offline.output
-    tasks.named('test', Test).configure {
-        forkEvery = 1
-    }
 
     TaskProvider<Jar> offlineJar = tasks.register('offlineJar', Jar) {
         dependsOn(offlineClasses)

core/build.gradle

@@ -170,12 +170,8 @@ dependencies {
     testImplementation(libs.multiverseCore)
 }
 
-int coreTestForks = Math.max(1, Integer.parseInt(providers.gradleProperty('testForks')
-    .getOrElse(String.valueOf(Math.max(1, (int) (Runtime.runtime.availableProcessors() / 2))))))
-
 tasks.named('test').configure {
     maxHeapSize = '1g'
-    maxParallelForks = coreTestForks
     jvmArgs('-XX:+ExitOnOutOfMemoryError')
 }
 

core/src/test/java/art/arcane/iris/generation/decoration/IrisOreBandsTest.java

@@ -1,6 +1,8 @@
 package art.arcane.iris.generation.decoration;
 
 import art.arcane.iris.generation.block.IrisBlockData;
+import art.arcane.iris.pack.loading.IrisData;
+import art.arcane.iris.testsupport.KeyedBlockState;
 import art.arcane.iris.generation.noise.IrisGeneratorStyle;
 import art.arcane.iris.generation.noise.NoiseStyle;
 import art.arcane.iris.generation.terrain.IrisMaterialPalette;
@@ -17,11 +19,6 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyDouble;
-import static org.mockito.ArgumentMatchers.isNull;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
 
 public class IrisOreBandsTest {
     private static final RNG RNG_SOURCE = new RNG(77L);
@@ -69,10 +66,8 @@ public class IrisOreBandsTest {
     @Test
     public void constantChanceMatchesSamplingTheFlatField() {
         IrisOreGenerator flat = new IrisOreGenerator();
-        IrisMaterialPalette palette = mock(IrisMaterialPalette.class);
-        NativeBlockState ore = mock(NativeBlockState.class);
-        when(palette.getPalette()).thenReturn(new KList<>(mock(IrisBlockData.class)));
-        when(palette.get(any(), anyDouble(), anyDouble(), anyDouble(), isNull())).thenReturn(ore);
+        NativeBlockState ore = new KeyedBlockState("minecraft:iron_ore");
+        IrisMaterialPalette palette = new FixedPalette(ore);
         IrisGeneratorStyle style = new IrisGeneratorStyle(NoiseStyle.FLAT).setZoom(2.5D).setExponent(1.3D)
                 .setFracture(new IrisGeneratorStyle(NoiseStyle.SIMPLEX).setMultiplier(9D));
         flat.setPalette(palette).setChanceStyle(style).setRange(new IrisRange(0, 100));
@@ -101,20 +96,9 @@ public class IrisOreBandsTest {
 
     private static IrisOreGenerator generator(double min, double max, double threshold, long seed) {
         IrisOreGenerator generator = new IrisOreGenerator();
-        IrisMaterialPalette palette = mock(IrisMaterialPalette.class);
-        NativeBlockState state = mock(NativeBlockState.class);
-        when(palette.getPalette()).thenReturn(new KList<>(mock(IrisBlockData.class)));
-        when(palette.get(any(), anyDouble(), anyDouble(), anyDouble(), isNull())).thenReturn(state);
-        CNG chance = mock(CNG.class);
-        when(chance.noise(anyDouble(), anyDouble(), anyDouble())).thenAnswer(invocation -> {
-            long hash = seed;
-            hash = hash * 31 + Double.doubleToLongBits(invocation.getArgument(0));
-            hash = hash * 31 + Double.doubleToLongBits(invocation.getArgument(1));
-            hash = hash * 31 + Double.doubleToLongBits(invocation.getArgument(2));
-            return new Random(hash).nextDouble();
-        });
-        IrisGeneratorStyle style = mock(IrisGeneratorStyle.class);
-        when(style.create(any(), isNull())).thenReturn(chance);
+        NativeBlockState state = new KeyedBlockState("minecraft:iron_ore");
+        IrisMaterialPalette palette = new FixedPalette(state);
+        IrisGeneratorStyle style = new FixedChanceStyle(new CoordinateChance(seed));
         return generator.setPalette(palette).setChanceStyle(style).setThreshold(threshold)
                 .setRange(new IrisRange(min, max));
     }
@@ -131,4 +115,49 @@ public class IrisOreBandsTest {
         assertSame(scan(ores, 0, 58, 0), bands.generate(0, 58, 0, RNG_SOURCE, null));
         assertNull(bands.contains(59) ? bands.generate(0, 59, 0, RNG_SOURCE, null) : null);
     }
+    private static final class FixedPalette extends IrisMaterialPalette {
+        private final NativeBlockState state;
+
+        private FixedPalette(NativeBlockState state) {
+            this.state = state;
+            setPalette(new KList<>(new IrisBlockData()));
+        }
+
+        @Override
+        public NativeBlockState get(RNG rng, double x, double y, double z, IrisData data) {
+            return state;
+        }
+    }
+
+    private static final class FixedChanceStyle extends IrisGeneratorStyle {
+        private final CNG chance;
+
+        private FixedChanceStyle(CNG chance) {
+            this.chance = chance;
+        }
+
+        @Override
+        public CNG create(RNG rng, IrisData data) {
+            return chance;
+        }
+    }
+
+    private static final class CoordinateChance extends CNG {
+        private final long seed;
+
+        private CoordinateChance(long seed) {
+            super(new RNG(seed));
+            this.seed = seed;
+        }
+
+        @Override
+        public double noise(double x, double y, double z) {
+            long hash = seed;
+            hash = hash * 31 + Double.doubleToLongBits(x);
+            hash = hash * 31 + Double.doubleToLongBits(y);
+            hash = hash * 31 + Double.doubleToLongBits(z);
+            return new Random(hash).nextDouble();
+        }
+    }
+
 }

core/src/test/java/art/arcane/iris/generation/hydrology/HydrologyPlanHashTest.java

@@ -11,6 +11,7 @@ import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
+import java.util.HexFormat;
 import java.util.Map;
 
 import static org.junit.Assert.assertEquals;
@@ -27,7 +28,7 @@ public class HydrologyPlanHashTest {
 
     @Test
     public void fullTilePlansAreByteIdentical() {
-        StringBuilder canonical = new StringBuilder();
+        MessageDigest canonical = sha256();
         int courses = 0;
         int columns = 0;
         for (long seed : new long[]{77L, 19L}) {
@@ -37,16 +38,16 @@ public class HydrologyPlanHashTest {
                 HydrologyTile tile = planner.plan(key);
                 courses += tile.courses().size();
                 columns += tile.footprint().columns().size();
-                canonical.append(render(tile));
+                render(tile, canonical);
             }
         }
         assertTrue("planned courses: " + courses, courses > 0);
         assertTrue("planned columns: " + columns, columns > 0);
-        assertEquals(EXPECTED_PLAN_DIGEST, digest(canonical.toString()));
+        assertEquals(EXPECTED_PLAN_DIGEST, HexFormat.of().formatHex(canonical.digest()));
     }
 
-    private static String render(HydrologyTile tile) {
-        StringBuilder out = new StringBuilder();
+    private static void render(HydrologyTile tile, MessageDigest digest) {
+        CanonicalDigest out = new CanonicalDigest(digest);
         out.append("tile ").append(tile.key()).append('\n');
         out.append("seed ").append(tile.worldSeed()).append('\n');
         out.append("fingerprint ").append(tile.settingsFingerprint()).append('\n');
@@ -78,23 +79,14 @@ public class HydrologyPlanHashTest {
         for (Map.Entry<Long, HydrologyColumnSample> column : columns) {
             out.append("column ").append(column.getKey()).append(' ').append(column.getValue()).append('\n');
         }
-        return out.toString();
     }
 
-    private static String digest(String value) {
-        MessageDigest sha256;
+    private static MessageDigest sha256() {
         try {
-            sha256 = MessageDigest.getInstance("SHA-256");
-        } catch (NoSuchAlgorithmException e) {
-            throw new IllegalStateException(e);
+            return MessageDigest.getInstance("SHA-256");
+        } catch (NoSuchAlgorithmException failure) {
+            throw new IllegalStateException(failure);
         }
-        byte[] hash = sha256.digest(value.getBytes(StandardCharsets.UTF_8));
-        StringBuilder hex = new StringBuilder(hash.length * 2);
-        for (byte b : hash) {
-            hex.append(Character.forDigit((b >> 4) & 0xF, 16));
-            hex.append(Character.forDigit(b & 0xF, 16));
-        }
-        return hex.toString();
     }
 
     private static HydrologyTerrainSampler rollingCoast(int coastX) {
@@ -230,4 +222,22 @@ public class HydrologyPlanHashTest {
                 HydrologyPlannerSettings.SurfacePolicyBounds.NONE
         );
     }
+
+    private static final class CanonicalDigest {
+        private final MessageDigest digest;
+
+        private CanonicalDigest(MessageDigest digest) {
+            this.digest = digest;
+        }
+
+        private CanonicalDigest append(Object value) {
+            digest.update(String.valueOf(value).getBytes(StandardCharsets.UTF_8));
+            return this;
+        }
+
+        private CanonicalDigest append(char value) {
+            digest.update((byte) value);
+            return this;
+        }
+    }
 }

core/src/test/java/art/arcane/iris/generation/mantle/CaveTerrainSnapshotTest.java

@@ -23,6 +23,7 @@ import static org.junit.Assert.assertTrue;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.withSettings;
 
 public class CaveTerrainSnapshotTest {
     private static final int SECTIONS = 5;
@@ -176,7 +177,7 @@ public class CaveTerrainSnapshotTest {
 
     @SuppressWarnings("unchecked")
     private static MantleChunk<Matter> chunk(Matter[] sections) {
-        MantleChunk<Matter> chunk = mock(MantleChunk.class);
+        MantleChunk<Matter> chunk = mock(MantleChunk.class, withSettings().stubOnly());
         when(chunk.sectionCount()).thenReturn(sections.length);
         when(chunk.exists(anyInt())).thenAnswer(call -> {
             int section = call.getArgument(0);

core/src/test/java/art/arcane/iris/generation/mantle/IrisCaveCarver3DNearParityTest.java

@@ -20,6 +20,7 @@ import art.arcane.volmlib.util.math.RNG;
 import art.arcane.volmlib.util.matter.Matter;
 import art.arcane.volmlib.util.matter.MatterCavern;
 import art.arcane.volmlib.util.matter.MatterSlice;
+import art.arcane.volmlib.util.matter.slices.CavernMatter;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
@@ -52,6 +53,7 @@ import static org.mockito.ArgumentMatchers.anyDouble;
 import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.withSettings;
 
 public class IrisCaveCarver3DNearParityTest {
     private static final long CARVE_SEED = -54_777_863_784_492_918L;
@@ -136,7 +138,7 @@ public class IrisCaveCarver3DNearParityTest {
                 createProfile(false, false).setDetailWeight(0D).setAllowFluid(false));
         AtomicInteger calls = new AtomicInteger();
         Set<Integer> sampledY = new HashSet<>();
-        CNG density = mock(CNG.class);
+        CNG density = mock(CNG.class, withSettings().stubOnly());
         doAnswer(invocation -> {
             calls.incrementAndGet();
             double x = invocation.getArgument(0);
@@ -193,14 +195,14 @@ public class IrisCaveCarver3DNearParityTest {
 
     @Test
     public void expressionStylesKeepTheOriginalSamplingAndCarvingBehavior() throws Exception {
-        CNG density = mock(CNG.class);
+        CNG density = mock(CNG.class, withSettings().stubOnly());
         AtomicInteger calls = new AtomicInteger();
         doAnswer(invocation -> {
             calls.incrementAndGet();
             double y = invocation.getArgument(1);
             return Math.sin(y * 0.2D);
         }).when(density).noiseFastSigned3D(anyDouble(), anyDouble(), anyDouble());
-        IrisGeneratorStyle style = mock(IrisGeneratorStyle.class);
+        IrisGeneratorStyle style = mock(IrisGeneratorStyle.class, withSettings().stubOnly());
         doReturn("density_expression").when(style).getExpression();
         doReturn(density).when(style).create(any(RNG.class), any(IrisData.class));
         IrisCaveProfile profile = createProfile(false, false).setBaseDensityStyle(style)
@@ -240,10 +242,10 @@ public class IrisCaveCarver3DNearParityTest {
                     .setModules(new KList<>(new IrisCaveFieldModule(new IrisGeneratorStyle(NoiseStyle.FLAT),
                             1D, 0D, new IrisRange(5D, 6D), false)));
             IrisCaveCarver3D carver = new IrisCaveCarver3D(engine, profile);
-            CNG base = mock(CNG.class);
+            CNG base = mock(CNG.class, withSettings().stubOnly());
             doReturn(1D).when(base).noiseFastSigned3D(anyDouble(), anyDouble(), anyDouble());
             baseDensityField.set(carver, base);
-            CNG module = mock(CNG.class);
+            CNG module = mock(CNG.class, withSettings().stubOnly());
             doReturn(-1D).when(module).noiseFastSigned3D(anyDouble(), anyDouble(), anyDouble());
             moduleDensityField.set(((CaveFieldModuleState[]) modulesField.get(carver))[0], module);
             WriterCapture capture = createWriterCapture(128);
@@ -307,7 +309,7 @@ public class IrisCaveCarver3DNearParityTest {
             WriterCapture capture = createWriterCapture(128);
             if (fail) {
                 AtomicInteger samples = new AtomicInteger();
-                CNG density = mock(CNG.class);
+                CNG density = mock(CNG.class, withSettings().stubOnly());
                 doAnswer(invocation -> {
                     if (samples.incrementAndGet() > 300) {
                         throw new IllegalStateException("Density sample failed");
@@ -380,7 +382,7 @@ public class IrisCaveCarver3DNearParityTest {
                 .setDetailWeight(0D)
                 .setDensityThreshold(new IrisStyledRange(-2D, -2D, new IrisGeneratorStyle(NoiseStyle.FLAT)));
         IrisCaveCarver3D carver = new IrisCaveCarver3D(engine, profile);
-        CNG detail = mock(CNG.class);
+        CNG detail = mock(CNG.class, withSettings().stubOnly());
         doAnswer(invocation -> {
             throw new AssertionError("Rejected voxel sampled an aquifer");
         }).when(detail).noiseFastSigned3D(anyDouble(), anyDouble(), anyDouble());
@@ -1343,10 +1345,10 @@ public class IrisCaveCarver3DNearParityTest {
     }
 
     private Engine createEngine(int worldHeight, int sampledHeight) {
-        Engine engine = mock(Engine.class);
-        IrisData data = mock(IrisData.class);
-        IrisDimension dimension = mock(IrisDimension.class);
-        SeedManager seedManager = mock(SeedManager.class);
+        Engine engine = mock(Engine.class, withSettings().stubOnly());
+        IrisData data = mock(IrisData.class, withSettings().stubOnly());
+        IrisDimension dimension = mock(IrisDimension.class, withSettings().stubOnly());
+        SeedManager seedManager = mock(SeedManager.class, withSettings().stubOnly());
         EngineMetrics metrics = new EngineMetrics(16);
         IrisWorld world = IrisWorld.builder().minHeight(0).maxHeight(worldHeight).build();
 
@@ -1467,15 +1469,15 @@ public class IrisCaveCarver3DNearParityTest {
     }
 
     private WriterCapture createWriterCapture(int worldHeight) {
-        MantleWriter writer = mock(MantleWriter.class);
+        MantleWriter writer = mock(MantleWriter.class, withSettings().stubOnly());
         @SuppressWarnings("unchecked")
-        Mantle<Matter> mantle = mock(Mantle.class);
+        Mantle<Matter> mantle = mock(Mantle.class, withSettings().stubOnly());
         @SuppressWarnings("unchecked")
-        MantleChunk<Matter> chunk = mock(MantleChunk.class);
+        MantleChunk<Matter> chunk = mock(MantleChunk.class, withSettings().stubOnly());
         Map<Integer, Matter> sections = new HashMap<>();
-        Map<Integer, Map<Integer, MatterCavern>> sectionCells = new HashMap<>();
         Set<String> carvedCells = new HashSet<>();
         Map<String, Byte> carvedLiquids = new HashMap<>();
+        WriterCapture capture = new WriterCapture(writer, carvedCells, carvedLiquids);
 
         doReturn(mantle).when(writer).getMantle();
         doReturn(worldHeight).when(mantle).getWorldHeight();
@@ -1488,41 +1490,19 @@ public class IrisCaveCarver3DNearParityTest {
                 return section;
             }
 
-            Matter created = createSection(sectionIndex, sectionCells, carvedCells, carvedLiquids);
+            Matter created = createSection(sectionIndex, capture);
             sections.put(sectionIndex, created);
             return created;
         }).when(chunk).getOrCreate(anyInt());
 
-        return new WriterCapture(writer, carvedCells, carvedLiquids);
+        return capture;
     }
 
-    private Matter createSection(int sectionIndex, Map<Integer, Map<Integer, MatterCavern>> sectionCells, Set<String> carvedCells, Map<String, Byte> carvedLiquids) {
-        Matter matter = mock(Matter.class);
-        @SuppressWarnings("unchecked")
-        MatterSlice<MatterCavern> slice = mock(MatterSlice.class);
-        Map<Integer, MatterCavern> localCells = sectionCells.computeIfAbsent(sectionIndex, key -> new HashMap<>());
-
+    private Matter createSection(int sectionIndex, WriterCapture capture) {
+        Matter matter = mock(Matter.class, withSettings().stubOnly());
+        MatterSlice<MatterCavern> slice = new CapturingCavernMatter(sectionIndex, capture);
         doReturn(slice).when(matter).slice(MatterCavern.class);
         doReturn(slice).when(matter).getSlice(MatterCavern.class);
-        doAnswer(invocation -> {
-            int localX = invocation.getArgument(0);
-            int localY = invocation.getArgument(1);
-            int localZ = invocation.getArgument(2);
-            return localCells.get(packLocal(localX, localY, localZ));
-        }).when(slice).get(anyInt(), anyInt(), anyInt());
-        doAnswer(invocation -> {
-            int localX = invocation.getArgument(0);
-            int localY = invocation.getArgument(1);
-            int localZ = invocation.getArgument(2);
-            MatterCavern value = invocation.getArgument(3);
-            localCells.put(packLocal(localX, localY, localZ), value);
-            int worldY = (sectionIndex << 4) + localY;
-            String cellKey = cellKey(localX, worldY, localZ);
-            carvedCells.add(cellKey);
-            carvedLiquids.put(cellKey, value.getLiquid());
-            return null;
-        }).when(slice).set(anyInt(), anyInt(), anyInt(), any(MatterCavern.class));
-
         return matter;
     }
 
@@ -1649,10 +1629,6 @@ public class IrisCaveCarver3DNearParityTest {
         return (value * 2D) - 1D;
     }
 
-    private int packLocal(int x, int y, int z) {
-        return (x << 8) | (y << 4) | z;
-    }
-
     private String cellKey(int x, int y, int z) {
         return x + ":" + y + ":" + z;
     }
@@ -1752,6 +1728,25 @@ public class IrisCaveCarver3DNearParityTest {
         }
     }
 
+    private final class CapturingCavernMatter extends CavernMatter {
+        private final int sectionIndex;
+        private final WriterCapture capture;
+
+        private CapturingCavernMatter(int sectionIndex, WriterCapture capture) {
+            super(16, 16, 16);
+            this.sectionIndex = sectionIndex;
+            this.capture = capture;
+        }
+
+        @Override
+        public void set(int x, int y, int z, MatterCavern value) {
+            super.set(x, y, z, value);
+            String cell = cellKey(x, (sectionIndex << 4) + y, z);
+            capture.carvedCells.add(cell);
+            capture.carvedLiquids.put(cell, value.getLiquid());
+        }
+    }
+
     private static final class WriterCapture {
         private final MantleWriter writer;
         private final Set<String> carvedCells;

core/src/test/java/art/arcane/iris/generation/runtime/EngineBiomeColumnTest.java

@@ -15,39 +15,43 @@ import art.arcane.volmlib.util.collection.KList;
 import art.arcane.volmlib.util.collection.KMap;
 import art.arcane.volmlib.util.mantle.runtime.Mantle;
 import art.arcane.volmlib.util.mantle.runtime.MantleChunk;
+import art.arcane.volmlib.util.mantle.runtime.MantleDataAdapter;
+import art.arcane.volmlib.util.math.Position2;
 import art.arcane.volmlib.util.matter.Matter;
 import art.arcane.volmlib.util.matter.MatterCavern;
 import art.arcane.volmlib.util.stream.ProceduralStream;
+import art.arcane.volmlib.util.stream.interpolation.Interpolated;
 import org.junit.BeforeClass;
 import org.junit.Test;
 import org.mockito.MockedStatic;
 
 import java.util.List;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Proxy;
 import java.util.Random;
 
 import static org.junit.Assert.assertSame;
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.ArgumentMatchers.anyDouble;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.ArgumentMatchers.eq;
-import static org.mockito.Mockito.CALLS_REAL_METHODS;
-import static org.mockito.Mockito.doAnswer;
-import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.mockStatic;
 import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.withSettings;
 
 public class EngineBiomeColumnTest {
     private static final int SAMPLES = 96;
+    private static MantleDataAdapter<Matter> chunkAdapter;
+    private static final EnginePlatformHooks PLATFORM_HOOKS = new EnginePlatformHooks() {};
 
     @BeforeClass
     public static void initializeMantleBlockState() throws Exception {
-        NativeBlockState air = mock(NativeBlockState.class);
+        NativeBlockState air = mock(NativeBlockState.class, withSettings().stubOnly());
         try (MockedStatic<B> blocks = mockStatic(B.class)) {
             blocks.when(() -> B.getState("AIR")).thenReturn(air);
             Class.forName(EngineMantle.class.getName());
+            chunkAdapter = IrisEngineMantle.createRuntimeDataAdapter(null);
         }
     }
 
@@ -79,20 +83,18 @@ public class EngineBiomeColumnTest {
         IrisBiome custom = biome("iris:custom_cave", 0);
         IrisBiome configured = biome("iris:configured_cave", 0);
 
-        ProceduralStream<IrisBiome> surfaceStream = mock(ProceduralStream.class);
-        when(surfaceStream.get(anyDouble(), anyDouble())).thenAnswer(call ->
-                surfaces[pick(salt, call.getArgument(0), call.getArgument(1), 1, surfaces.length)]);
-        ProceduralStream<IrisBiome> caveStream = mock(ProceduralStream.class);
-        when(caveStream.get(anyDouble(), anyDouble())).thenAnswer(call ->
-                caves[pick(salt, call.getArgument(0), call.getArgument(1), 2, caves.length)]);
-        ProceduralStream<IrisRegion> regionStream = mock(ProceduralStream.class);
-        when(regionStream.get(anyDouble(), anyDouble())).thenAnswer(call ->
-                regions[pick(salt, call.getArgument(0), call.getArgument(1), 3, regions.length)]);
-        ProceduralStream<Double> heightStream = mock(ProceduralStream.class);
-        when(heightStream.get(anyDouble(), anyDouble())).thenAnswer(call ->
-                (double) (40 + pick(salt, call.getArgument(0), call.getArgument(1), 4, 300)));
+        Interpolated<IrisBiome> biomeInterpolation = Interpolated.of(biome -> 0D, value -> null);
+        Interpolated<IrisRegion> regionInterpolation = Interpolated.of(region -> 0D, value -> null);
+        ProceduralStream<IrisBiome> surfaceStream = ProceduralStream.of((x, z) ->
+                surfaces[pick(salt, x, z, 1, surfaces.length)], biomeInterpolation);
+        ProceduralStream<IrisBiome> caveStream = ProceduralStream.of((x, z) ->
+                caves[pick(salt, x, z, 2, caves.length)], biomeInterpolation);
+        ProceduralStream<IrisRegion> regionStream = ProceduralStream.of((x, z) ->
+                regions[pick(salt, x, z, 3, regions.length)], regionInterpolation);
+        ProceduralStream<Double> heightStream = ProceduralStream.of((x, z) ->
+                (double) (40 + pick(salt, x, z, 4, 300)), Interpolated.DOUBLE);
 
-        IrisComplex complex = mock(IrisComplex.class);
+        IrisComplex complex = mock(IrisComplex.class, withSettings().stubOnly());
         when(complex.getTrueBiomeStream()).thenReturn(surfaceStream);
         when(complex.getCaveBiomeStream()).thenReturn(caveStream);
         when(complex.getRegionStream()).thenReturn(regionStream);
@@ -100,27 +102,23 @@ public class EngineBiomeColumnTest {
         when(complex.isTerrain3DSurface(anyInt(), anyInt(), anyInt())).thenAnswer(call ->
                 pick(salt, (int) call.getArgument(0) * 31 + (int) call.getArgument(1), (int) call.getArgument(2), 5, 9) == 0);
 
-        Mantle<Matter> mantle = mock(Mantle.class);
+        Mantle<Matter> mantle = mock(Mantle.class, withSettings().stubOnly());
         when(mantle.getWorldHeight()).thenReturn(384);
         when(mantle.getLoadedRegions()).thenReturn(new KMap<>());
         when(mantle.hasTectonicPlate(anyInt(), anyInt())).thenReturn(true);
         when(mantle.get(anyInt(), anyInt(), anyInt(), eq(MatterCavern.class))).thenAnswer(call ->
                 cavern(salt, call.getArgument(0), call.getArgument(1), call.getArgument(2)));
-        when(mantle.useChunk(anyInt(), anyInt())).thenAnswer(call -> {
-            int chunkX = call.getArgument(0);
-            int chunkZ = call.getArgument(1);
-            MantleChunk<Matter> chunk = mock(MantleChunk.class);
-            when(chunk.get(anyInt(), anyInt(), anyInt(), eq(MatterCavern.class))).thenAnswer(read -> cavern(salt,
-                    chunkX * 16 + (int) read.getArgument(0), read.getArgument(1), chunkZ * 16 + (int) read.getArgument(2)));
-            return chunk;
+        when(mantle.useChunk(anyInt(), anyInt())).thenAnswer(call ->
+                new CoordinateChunk(salt, new Position2(call.getArgument(0), call.getArgument(1))).use());
+        EngineMantle engineMantle = (EngineMantle) Proxy.newProxyInstance(EngineMantle.class.getClassLoader(),
+                new Class<?>[]{EngineMantle.class}, (proxy, method, arguments) -> switch (method.getName()) {
+                    case "getMantle" -> mantle;
+                    case "getHighest" -> 20 + pick(salt, (int) arguments[0], (int) arguments[1], 7, 330);
+                    default -> throw new UnsupportedOperationException(method.getName());
                 });
-        EngineMantle engineMantle = mock(EngineMantle.class);
-        when(engineMantle.getMantle()).thenReturn(mantle);
-        doAnswer(call -> 20 + pick(salt, (int) call.getArgument(0), (int) call.getArgument(1), 7, 330))
-                .when(engineMantle).getHighest(anyInt(), anyInt(), any(IrisData.class), anyBoolean());
 
-        IrisData data = mock(IrisData.class);
-        ResourceLoader<IrisBiome> loader = mock(ResourceLoader.class);
+        IrisData data = mock(IrisData.class, withSettings().stubOnly());
+        ResourceLoader<IrisBiome> loader = mock(ResourceLoader.class, withSettings().stubOnly());
         when(data.getBiomeLoader()).thenReturn(loader);
         when(loader.load(anyString())).thenReturn(null);
         when(loader.load("iris:custom_cave")).thenReturn(custom);
@@ -136,15 +134,35 @@ public class EngineBiomeColumnTest {
             dimension.setCarving(new KList<>(List.of(root)));
         }
 
-        EnginePlatformHooks hooks = mock(EnginePlatformHooks.class);
-        Engine engine = mock(Engine.class, CALLS_REAL_METHODS);
-        doReturn(complex).when(engine).getComplex();
-        doReturn(engineMantle).when(engine).getMantle();
-        doReturn(hooks).when(engine).getPlatformHooks();
-        doReturn(data).when(engine).getData();
-        doReturn(dimension).when(engine).getDimension();
-        doReturn(IrisWorld.builder().minHeight(-64).maxHeight(320).build()).when(engine).getWorld();
-        return engine;
+        IrisWorld world = IrisWorld.builder().minHeight(-64).maxHeight(320).build();
+        return (Engine) Proxy.newProxyInstance(Engine.class.getClassLoader(), new Class<?>[]{Engine.class},
+                (proxy, method, arguments) -> switch (method.getName()) {
+                    case "getComplex" -> complex;
+                    case "getMantle" -> engineMantle;
+                    case "getPlatformHooks" -> PLATFORM_HOOKS;
+                    case "getData" -> data;
+                    case "getDimension" -> dimension;
+                    case "getWorld" -> world;
+                    default -> InvocationHandler.invokeDefault(proxy, method, arguments);
+                });
+    }
+
+    private static final class CoordinateChunk extends MantleChunk<Matter> {
+        private final long salt;
+        private final Position2 coordinates;
+
+        private CoordinateChunk(long salt, Position2 coordinates) {
+            super(24, coordinates.getX(), coordinates.getZ(), chunkAdapter, null);
+            this.salt = salt;
+            this.coordinates = coordinates;
+        }
+
+        @Override
+        public <T> T get(int x, int y, int z, Class<T> type) {
+            return type == MatterCavern.class
+                    ? type.cast(cavern(salt, coordinates.getX() * 16 + x, y, coordinates.getZ() * 16 + z))
+                    : null;
+        }
     }
 
     private static MatterCavern cavern(long salt, int x, int y, int z) {

core/src/test/java/art/arcane/iris/generation/stage/IrisDepositModifierOrderingTest.java

@@ -3,6 +3,8 @@ package art.arcane.iris.generation.stage;
 import art.arcane.iris.testsupport.KeyedBlockState;
 
 import art.arcane.iris.generation.runtime.Engine;
+import art.arcane.iris.generation.biome.IrisBiome;
+import art.arcane.iris.generation.terrain.IrisRegion;
 import art.arcane.iris.generation.decoration.IrisDepositGenerator;
 import art.arcane.iris.generation.decoration.IrisDepositHeightDistribution;
 import art.arcane.iris.generation.decoration.IrisDepositPlacementScope;
@@ -17,6 +19,9 @@ import art.arcane.iris.generation.geometry.IrisBlockVector;
 import art.arcane.iris.generation.concurrent.BurstExecutor;
 import art.arcane.iris.generation.concurrent.MultiBurst;
 import art.arcane.iris.generation.context.ChunkContext;
+import art.arcane.iris.generation.context.ChunkedDataCache;
+import art.arcane.volmlib.util.stream.ProceduralStream;
+import art.arcane.volmlib.util.stream.interpolation.Interpolated;
 import art.arcane.volmlib.util.hunk.Hunk;
 import art.arcane.volmlib.util.collection.KList;
 import art.arcane.volmlib.util.mantle.runtime.MantleChunk;
@@ -50,6 +55,7 @@ import static org.mockito.Mockito.mockStatic;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.withSettings;
 
 public class IrisDepositModifierOrderingTest {
     @ClassRule
@@ -58,10 +64,10 @@ public class IrisDepositModifierOrderingTest {
     @Before
     public void bindPlatform() {
         IrisPlatforms.unbind();
-        PlatformRegistries registries = mock(PlatformRegistries.class);
+        PlatformRegistries registries = mock(PlatformRegistries.class, withSettings().stubOnly());
         NativeBlockState stone = state("stone");
         when(registries.block(anyString())).thenReturn(stone);
-        IrisPlatform platform = mock(IrisPlatform.class);
+        IrisPlatform platform = mock(IrisPlatform.class, withSettings().stubOnly());
         when(platform.registries()).thenReturn(registries);
         IrisPlatforms.bind(platform);
     }
@@ -274,8 +280,8 @@ public class IrisDepositModifierOrderingTest {
         private final List<String> samples = Collections.synchronizedList(new ArrayList<>());
         private final CountDownLatch biomeReady = new CountDownLatch(1);
         private final CountDownLatch regionReady = new CountDownLatch(1);
-        private final Engine engine = mock(Engine.class, RETURNS_DEEP_STUBS);
-        private final ChunkContext context = mock(ChunkContext.class, RETURNS_DEEP_STUBS);
+        private final Engine engine = mock(Engine.class, withSettings().stubOnly().defaultAnswer(RETURNS_DEEP_STUBS));
+        private final ChunkContext context = mock(ChunkContext.class, withSettings().stubOnly().defaultAnswer(RETURNS_DEEP_STUBS));
         private final NativeBlockState stone = state("stone");
         private final NativeBlockState granite = state("granite");
         private final NativeBlockState diorite = state("diorite");
@@ -289,15 +295,23 @@ public class IrisDepositModifierOrderingTest {
         private Fixture(boolean parallel, int attempts) {
             this.parallel = parallel;
             this.attempts = attempts;
+            IrisBiome biome = mock(IrisBiome.class, withSettings().stubOnly());
+            IrisRegion region = mock(IrisRegion.class, withSettings().stubOnly());
+            ChunkedDataCache<IrisBiome> biomes = new ChunkedDataCache<>(
+                    ProceduralStream.of((x, z) -> biome, Interpolated.of(value -> 0D, value -> null)), 0, 0);
+            ChunkedDataCache<IrisRegion> regions = new ChunkedDataCache<>(
+                    ProceduralStream.of((x, z) -> region, Interpolated.of(value -> 0D, value -> null)), 0, 0);
+            when(context.getBiome()).thenReturn(biomes);
+            when(context.getRegion()).thenReturn(regions);
             when(engine.getHeight()).thenReturn(16);
             when(engine.getCaveBiome(anyInt(), anyInt(), anyInt(), any())).thenReturn(null);
             when(engine.getDimension().getDepositVariants()).thenReturn(new KList<>());
-            when(context.getRegion().get(anyInt(), anyInt()).getDepositVariants()).thenReturn(new KList<>());
+            when(region.getDepositVariants()).thenReturn(new KList<>());
             when(context.getGenerationSessionId()).thenReturn(11L);
             chunk = mock(MantleChunk.class);
             Mantle<Matter> mantle = engine.getMantle().getMantle();
             doReturn(chunk).when(mantle).useChunk(0, 0);
-            MultiBurst pool = mock(MultiBurst.class);
+            MultiBurst pool = mock(MultiBurst.class, withSettings().stubOnly());
             BurstExecutor burst = new BurstExecutor(executor, 3);
             burst.setMulticore(parallel);
             when(engine.burst()).thenReturn(pool);
@@ -306,8 +320,8 @@ public class IrisDepositModifierOrderingTest {
             IrisDepositGenerator regionDeposit = generator("region", granite, diorite);
             IrisDepositGenerator biomeDeposit = generator("biome", diorite, diamond);
             when(engine.getDimension().getDeposits()).thenReturn(new KList<>(dimensionDeposit));
-            when(context.getRegion().get(7, 7).getDeposits()).thenReturn(new KList<>(regionDeposit));
-            when(context.getBiome().get(7, 7).getDeposits()).thenReturn(new KList<>(biomeDeposit));
+            when(region.getDeposits()).thenReturn(new KList<>(regionDeposit));
+            when(biome.getDeposits()).thenReturn(new KList<>(biomeDeposit));
             for (int x = 0; x < 16; x++) {
                 for (int z = 0; z < 16; z++) {
                     output.set(x, 4, z, stone);
@@ -316,7 +330,7 @@ public class IrisDepositModifierOrderingTest {
         }
 
         private IrisDepositGenerator generator(String name, NativeBlockState requiredHost, NativeBlockState replacement) {
-            IrisDepositGenerator generator = mock(IrisDepositGenerator.class);
+            IrisDepositGenerator generator = mock(IrisDepositGenerator.class, withSettings().stubOnly());
             when(generator.getSpawnChance()).thenReturn(1D);
             when(generator.getPerClumpSpawnChance()).thenReturn(1D);
             when(generator.getMinPerChunk()).thenReturn(attempts);
@@ -355,7 +369,7 @@ public class IrisDepositModifierOrderingTest {
         }
 
         private void generate() {
-            try (MockedStatic<B> blocks = mockStatic(B.class, CALLS_REAL_METHODS)) {
+            try (MockedStatic<B> blocks = mockStatic(B.class, withSettings().stubOnly().defaultAnswer(CALLS_REAL_METHODS))) {
                 blocks.when(() -> B.toDeepSlateOre(any(), any())).thenAnswer(invocation -> invocation.getArgument(1));
                 new IrisDepositModifier(engine).generateDeposits(output, 0, 0, parallel, context);
             }

core/src/test/java/art/arcane/iris/generation/stage/IrisDepositModifierParityTest.java

@@ -21,6 +21,9 @@ import art.arcane.iris.testsupport.PlatformLeakGuard;
 import art.arcane.iris.generation.block.B;
 import art.arcane.iris.generation.concurrent.MultiBurst;
 import art.arcane.iris.generation.context.ChunkContext;
+import art.arcane.iris.generation.context.ChunkedDataCache;
+import art.arcane.volmlib.util.stream.ProceduralStream;
+import art.arcane.volmlib.util.stream.interpolation.Interpolated;
 import art.arcane.volmlib.util.hunk.Hunk;
 import art.arcane.volmlib.util.collection.KList;
 import art.arcane.volmlib.util.mantle.runtime.Mantle;
@@ -53,6 +56,7 @@ import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.mockStatic;
 import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.withSettings;
 
 public class IrisDepositModifierParityTest {
     @ClassRule
@@ -63,9 +67,9 @@ public class IrisDepositModifierParityTest {
     @Before
     public void bindPlatform() {
         IrisPlatforms.unbind();
-        PlatformRegistries registries = mock(PlatformRegistries.class);
+        PlatformRegistries registries = mock(PlatformRegistries.class, withSettings().stubOnly());
         when(registries.block(anyString())).thenAnswer(invocation -> state(invocation.getArgument(0)));
-        IrisPlatform platform = mock(IrisPlatform.class);
+        IrisPlatform platform = mock(IrisPlatform.class, withSettings().stubOnly());
         when(platform.registries()).thenReturn(registries);
         IrisPlatforms.bind(platform);
     }
@@ -125,8 +129,8 @@ public class IrisDepositModifierParityTest {
     @SuppressWarnings("unchecked")
     private long[] generateConfigured(long seed, boolean multicore, boolean caveVariant, boolean enumerablePack,
                                       AtomicInteger caveBiomeLookups, AtomicInteger unmatchableClumps) {
-        Engine engine = mock(Engine.class, RETURNS_DEEP_STUBS);
-        ChunkContext context = mock(ChunkContext.class, RETURNS_DEEP_STUBS);
+        Engine engine = mock(Engine.class, withSettings().stubOnly().defaultAnswer(RETURNS_DEEP_STUBS));
+        ChunkContext context = mock(ChunkContext.class, withSettings().stubOnly().defaultAnswer(RETURNS_DEEP_STUBS));
         IrisDimension dimension = new IrisDimension();
         IrisRegion region = new IrisRegion();
         IrisBiome surface = new IrisBiome();
@@ -170,9 +174,9 @@ public class IrisDepositModifierParityTest {
         when(engine.getSeedManager().getDeposit()).thenReturn(seed);
         when(engine.getDimension()).thenReturn(dimension);
         if (enumerablePack) {
-            IrisData data = mock(IrisData.class);
-            ResourceLoader<IrisBiome> biomes = mock(ResourceLoader.class);
-            ResourceLoader<IrisRegion> regions = mock(ResourceLoader.class);
+            IrisData data = mock(IrisData.class, withSettings().stubOnly());
+            ResourceLoader<IrisBiome> biomes = mock(ResourceLoader.class, withSettings().stubOnly());
+            ResourceLoader<IrisRegion> regions = mock(ResourceLoader.class, withSettings().stubOnly());
             when(data.getBiomeLoader()).thenReturn(biomes);
             when(data.getRegionLoader()).thenReturn(regions);
             when(biomes.getPossibleKeys()).thenReturn(new String[]{"allowed", "denied", "surface"});
@@ -192,9 +196,13 @@ public class IrisDepositModifierParityTest {
             return ((Math.floorDiv(x, 8) + Math.floorDiv(z, 8) + Math.floorDiv(y, 8)) & 1) == 0 ? cave : denied;
         });
         when(context.getRoundedHeight(anyInt(), anyInt())).thenReturn(40);
-        when(context.getBiome().get(anyInt(), anyInt())).thenReturn(surface);
-        when(context.getRegion().get(anyInt(), anyInt())).thenReturn(region);
-        MantleChunk<Matter> chunk = mock(MantleChunk.class);
+        ChunkedDataCache<IrisBiome> biomes = new ChunkedDataCache<>(
+                ProceduralStream.of((x, z) -> surface, Interpolated.of(value -> 0D, value -> null)), 0, 0);
+        ChunkedDataCache<IrisRegion> regions = new ChunkedDataCache<>(
+                ProceduralStream.of((x, z) -> region, Interpolated.of(value -> 0D, value -> null)), 0, 0);
+        when(context.getBiome()).thenReturn(biomes);
+        when(context.getRegion()).thenReturn(regions);
+        MantleChunk<Matter> chunk = mock(MantleChunk.class, withSettings().stubOnly());
         Mantle<Matter> mantle = engine.getMantle().getMantle();
         doReturn(chunk).when(mantle).useChunk(-3, 5);
         MatterCavern cavern = new MatterCavern(true, "allowed", (byte) 0);
@@ -215,7 +223,7 @@ public class IrisDepositModifierParityTest {
         }
         MultiBurst burst = new MultiBurst("Deposit parity", () -> 4);
         when(engine.burst()).thenReturn(burst);
-        try (MockedStatic<B> blocks = mockStatic(B.class, CALLS_REAL_METHODS)) {
+        try (MockedStatic<B> blocks = mockStatic(B.class, withSettings().stubOnly().defaultAnswer(CALLS_REAL_METHODS))) {
             blocks.when(() -> B.getStateOrNull(anyString(), anyBoolean()))
                     .thenAnswer(invocation -> state(invocation.getArgument(0)));
             blocks.when(() -> B.toDeepSlateOre(any(), any())).thenAnswer(invocation -> {

core/src/test/java/art/arcane/iris/generation/stage/IrisPerfectionModifierColumnTest.java

@@ -30,7 +30,6 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.RETURNS_DEEP_STUBS;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
@@ -245,27 +244,150 @@ public class IrisPerfectionModifierColumnTest {
             if (existing != null) {
                 return existing;
             }
-            NativeBlockState block = mock(NativeBlockState.class, withSettings().stubOnly());
+            NativeBlockState block = new TestBlockState(this, key);
             states.put(key, block);
-            when(block.key()).thenReturn(key);
-            when(block.isAir()).thenReturn(key.equals("minecraft:air"));
-            when(block.isFluid()).thenReturn(key.equals("minecraft:water"));
-            when(block.isWater()).thenReturn(key.equals("minecraft:water"));
-            when(block.isWaterLogged()).thenReturn(key.contains("waterlogged=true"));
-            when(block.isDecorant()).thenReturn(key.equals("minecraft:poppy") || key.startsWith("minecraft:tall_grass"));
-            when(block.canPlaceOnto(any())).thenAnswer(call -> "minecraft:tall_grass[half=lower]".equals(call.<NativeBlockState>getArgument(0).key()));
-            BlockData handle = mock(BlockData.class, withSettings().stubOnly());
-            when(block.nativeHandle()).thenReturn(handle);
-            when(handle.isFaceSturdy(any(), any())).thenReturn(key.equals("minecraft:stone"));
-            when(block.withProperty(anyString(), anyString())).thenAnswer(call -> {
-                String property = call.getArgument(0);
-                String value = call.getArgument(1);
-                return state(key.replaceAll(property + "=[^,\\]]+", property + "=" + value));
-            });
             return block;
         }
     }
 
+    private static final class TestBlockState implements NativeBlockState {
+        private final Fixture fixture;
+        private final String key;
+        private final BlockData handle;
+
+        private TestBlockState(Fixture fixture, String key) {
+            this.fixture = fixture;
+            this.key = key;
+            handle = mock(BlockData.class, withSettings().stubOnly());
+            when(handle.isFaceSturdy(any(), any())).thenReturn(key.equals("minecraft:stone"));
+        }
+
+        @Override
+        public String key() {
+            return key;
+        }
+
+        @Override
+        public String namespace() {
+            return null;
+        }
+
+        @Override
+        public boolean isAir() {
+            return key.equals("minecraft:air");
+        }
+
+        @Override
+        public boolean isFluid() {
+            return key.equals("minecraft:water");
+        }
+
+        @Override
+        public boolean isWater() {
+            return key.equals("minecraft:water");
+        }
+
+        @Override
+        public boolean isWaterLogged() {
+            return key.contains("waterlogged=true");
+        }
+
+        @Override
+        public boolean isDecorant() {
+            return key.equals("minecraft:poppy") || key.startsWith("minecraft:tall_grass");
+        }
+
+        @Override
+        public boolean canPlaceOnto(NativeBlockState onto) {
+            return "minecraft:tall_grass[half=lower]".equals(onto.key());
+        }
+
+        @Override
+        public Object nativeHandle() {
+            return handle;
+        }
+
+        @Override
+        public NativeBlockState withProperty(String property, String value) {
+            return fixture.state(key.replaceAll(property + "=[^,\\]]+", property + "=" + value));
+        }
+
+        @Override
+        public boolean isSolid() {
+            return false;
+        }
+
+        @Override
+        public boolean isOccluding() {
+            return false;
+        }
+
+        @Override
+        public boolean isCustom() {
+            return false;
+        }
+
+        @Override
+        public boolean isLit() {
+            return false;
+        }
+
+        @Override
+        public boolean isUpdatable() {
+            return false;
+        }
+
+        @Override
+        public boolean isFoliage() {
+            return false;
+        }
+
+        @Override
+        public boolean isTreeBlock() {
+            return false;
+        }
+
+        @Override
+        public boolean isFoliagePlantable() {
+            return false;
+        }
+
+        @Override
+        public boolean isStorage() {
+            return false;
+        }
+
+        @Override
+        public boolean isStorageChest() {
+            return false;
+        }
+
+        @Override
+        public boolean isOre() {
+            return false;
+        }
+
+        @Override
+        public boolean isDeepSlate() {
+            return false;
+        }
+
+        @Override
+        public boolean isVineBlock() {
+            return false;
+        }
+
+        @Override
+        public boolean hasTileEntity() {
+            return false;
+        }
+
+        @Override
+        public boolean matches(NativeBlockState state) {
+            return false;
+        }
+    }
+
     private static final class CountingHunk extends ArrayHunk<NativeBlockState> {
         private int cleanColumnReads;
 

core/src/test/java/art/arcane/iris/generation/terrain/IrisDimensionCarvingResolverParityTest.java

@@ -18,6 +18,7 @@ import art.arcane.volmlib.util.collection.KList;
 import org.junit.BeforeClass;
 import org.junit.Test;
 import org.mockito.invocation.InvocationOnMock;
+import org.mockito.MockMakers;
 
 import java.lang.ref.WeakReference;
 import java.lang.reflect.Field;
@@ -47,6 +48,7 @@ import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.clearInvocations;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.withSettings;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
@@ -348,7 +350,7 @@ public class IrisDimensionCarvingResolverParityTest {
         Fixture replacement = createMixedDepthFixture();
         AtomicReference<IrisDimension> dimension = new AtomicReference<>(first.engine.getDimension());
         AtomicReference<IrisData> data = new AtomicReference<>(first.engine.getData());
-        Engine engine = mock(Engine.class, CALLS_REAL_METHODS);
+        Engine engine = mock(Engine.class, withSettings().defaultAnswer(CALLS_REAL_METHODS).mockMaker(MockMakers.PROXY));
         doAnswer((InvocationOnMock invocation) -> dimension.get()).when(engine).getDimension();
         doAnswer((InvocationOnMock invocation) -> data.get()).when(engine).getData();
 
@@ -601,7 +603,7 @@ public class IrisDimensionCarvingResolverParityTest {
         doReturn(carvingEntries).when(dimension).getCarving();
         doReturn(index).when(dimension).getCarvingEntryIndex();
 
-        Engine engine = mock(Engine.class, CALLS_REAL_METHODS);
+        Engine engine = mock(Engine.class, withSettings().defaultAnswer(CALLS_REAL_METHODS).mockMaker(MockMakers.PROXY));
         doReturn(dimension).when(engine).getDimension();
         doReturn(data).when(engine).getData();
         doReturn(new SeedManager(913_531_771L)).when(engine).getSeedManager();
@@ -689,7 +691,7 @@ public class IrisDimensionCarvingResolverParityTest {
         doReturn(carvingEntries).when(dimension).getCarving();
         doReturn(index).when(dimension).getCarvingEntryIndex();
 
-        Engine engine = mock(Engine.class, CALLS_REAL_METHODS);
+        Engine engine = mock(Engine.class, withSettings().defaultAnswer(CALLS_REAL_METHODS).mockMaker(MockMakers.PROXY));
         doReturn(dimension).when(engine).getDimension();
         doReturn(data).when(engine).getData();
         doReturn(new SeedManager(4_627_991_643L)).when(engine).getSeedManager();

core/src/test/java/art/arcane/iris/studio/view/PregeneratorJobTerminalProgressTest.java

@@ -2,6 +2,7 @@ package art.arcane.iris.studio.view;
 
 import art.arcane.iris.configuration.IrisSettings;
 import art.arcane.iris.world.pregen.PregenApiPhase;
+import art.arcane.iris.world.pregen.MantleHeapPressure;
 import art.arcane.iris.world.pregen.PregenApiSink;
 import art.arcane.iris.world.pregen.PregenListener;
 import art.arcane.iris.world.pregen.PregenTask;
@@ -9,11 +10,13 @@ import art.arcane.iris.world.pregen.PregeneratorMethod;
 import art.arcane.iris.spi.IrisServices;
 import art.arcane.volmlib.util.math.Position2;
 import org.junit.Test;
+import org.mockito.MockedStatic;
 
 import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.atomic.AtomicReference;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -23,6 +26,7 @@ import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.mockStatic;
 import static org.mockito.Mockito.when;
 
 public class PregeneratorJobTerminalProgressTest {
@@ -89,6 +93,7 @@ public class PregeneratorJobTerminalProgressTest {
         PregeneratorMethod method = mock(PregeneratorMethod.class);
         when(method.getMethod(anyInt(), anyInt())).thenReturn("terminal-progress-test");
         ArrayList<PregenListener> pending = new ArrayList<>();
+        AtomicReference<MockedStatic<MantleHeapPressure>> heapPressure = new AtomicReference<>();
         doAnswer(invocation -> {
             pending.add(invocation.getArgument(2));
             if (completion.cancel()) {
@@ -97,6 +102,7 @@ public class PregeneratorJobTerminalProgressTest {
             return null;
         }).when(method).generateChunk(anyInt(), anyInt(), any(PregenListener.class));
         doAnswer(invocation -> {
+            try {
                 for (int index = 0; index < pending.size(); index++) {
                     PregenListener listener = pending.get(index);
                     if (completion.failLast() && index == pending.size() - 1) {
@@ -105,6 +111,12 @@ public class PregeneratorJobTerminalProgressTest {
                         listener.onChunkGenerated(0, 0, completion.cached());
                     }
                 }
+            } finally {
+                MockedStatic<MantleHeapPressure> pressure = heapPressure.getAndSet(null);
+                if (pressure != null) {
+                    pressure.close();
+                }
+            }
             return null;
         }).when(method).close();
         PregenTask task = PregenTask.builder().center(new Position2(0, 0))
@@ -112,7 +124,8 @@ public class PregeneratorJobTerminalProgressTest {
         Thread worker = null;
         try {
             assertNull(PregeneratorJob.getInstance());
-            PregeneratorJob job = new PregeneratorJob(new PregeneratorJob.Configuration(task, method, null, () -> {}));
+            PregeneratorJob job = new PregeneratorJob(new PregeneratorJob.Configuration(task, method, null,
+                    () -> heapPressure.set(mockStatic(MantleHeapPressure.class))));
             Field workerField = PregeneratorJob.class.getDeclaredField("worker");
             workerField.setAccessible(true);
             worker = (Thread) workerField.get(job);

core/src/test/java/art/arcane/iris/world/history/SavedBiomeCaptureTest.java

@@ -1,6 +1,8 @@
 package art.arcane.iris.world.history;
 
 import art.arcane.iris.generation.runtime.Engine;
+import art.arcane.iris.generation.runtime.IrisComplex;
+import art.arcane.volmlib.util.stream.ProceduralStream;
 import art.arcane.iris.generation.runtime.DimensionStackContext;
 import art.arcane.iris.generation.runtime.DimensionStackLayout;
 import art.arcane.iris.generation.subterrain.SubterrainCell;
@@ -87,7 +89,7 @@ public class SavedBiomeCaptureTest {
 
     @Test
     public void retainsFloatingChildIdentityWhenItSharesTheHostDerivative() throws Exception {
-        Engine engine = mock(Engine.class, RETURNS_DEEP_STUBS);
+        Engine engine = captureEngine();
         when(engine.getComplex().getSubterrainPlanner()).thenReturn(null);
         GenerationHistory.GenerationStage stage = mock(GenerationHistory.GenerationStage.class);
         SavedBiomeRuntime historical = mock(SavedBiomeRuntime.class);
@@ -129,7 +131,7 @@ public class SavedBiomeCaptureTest {
 
     @Test
     public void recordsExactSurfaceColumnsAndIndependentCaveAndVerticalIdentities() throws Exception {
-        Engine engine = mock(Engine.class, RETURNS_DEEP_STUBS);
+        Engine engine = captureEngine();
         when(engine.getComplex().getSubterrainPlanner()).thenReturn(null);
         GenerationHistory.GenerationStage stage = mock(GenerationHistory.GenerationStage.class);
         SavedBiomeRuntime historical = mock(SavedBiomeRuntime.class);
@@ -170,15 +172,15 @@ public class SavedBiomeCaptureTest {
 
     @Test
     public void preservesHostFeatureBiomeAndRegionAgainstStackAndFloatingOverlay() throws Exception {
-        Engine engine = mock(Engine.class, RETURNS_DEEP_STUBS);
+        Engine engine = captureEngine();
         when(engine.getComplex().getSubterrainPlanner()).thenReturn(null);
         IrisBiome upper = biome("upper-biome");
         IrisBiome authored = biome("authored-biome");
         IrisRegion upperRegion = region("upper-region");
         IrisRegion hostRegion = region("host-region");
-        DimensionStackContext stack = mock(DimensionStackContext.class);
-        DimensionStackLayout layout = mock(DimensionStackLayout.class);
-        DimensionStackLayout.Layer layer = mock(DimensionStackLayout.Layer.class);
+        DimensionStackContext stack = mock(DimensionStackContext.class, withSettings().stubOnly());
+        DimensionStackLayout layout = mock(DimensionStackLayout.class, withSettings().stubOnly());
+        DimensionStackLayout.Layer layer = mock(DimensionStackLayout.Layer.class, withSettings().stubOnly());
         when(engine.getDimensionStackContext()).thenReturn(stack);
         when(stack.getLayout(anyInt(), anyInt())).thenReturn(layout);
         when(layout.layerAt(anyInt())).thenReturn(layer);
@@ -220,15 +222,14 @@ public class SavedBiomeCaptureTest {
         }
         int chunkX = Math.floorDiv(edgeX, 16);
         int chunkZ = Math.floorDiv(anchor.z(), 16);
-        Engine engine = mock(Engine.class, withSettings().defaultAnswer(RETURNS_DEEP_STUBS)
-                .mockMaker(MockMakers.SUBCLASS));
+        Engine engine = captureEngine();
         IrisBiome fallback = biome("base-biome");
         IrisBiome authored = biome("authored-biome");
         IrisRegion host = region("host-region");
         IrisRegion stacked = region("stacked-region");
-        DimensionStackContext stack = mock(DimensionStackContext.class);
-        DimensionStackLayout layout = mock(DimensionStackLayout.class);
-        DimensionStackLayout.Layer layer = mock(DimensionStackLayout.Layer.class);
+        DimensionStackContext stack = mock(DimensionStackContext.class, withSettings().stubOnly());
+        DimensionStackLayout layout = mock(DimensionStackLayout.class, withSettings().stubOnly());
+        DimensionStackLayout.Layer layer = mock(DimensionStackLayout.Layer.class, withSettings().stubOnly());
         when(engine.getDimensionStackContext()).thenReturn(stack);
         when(stack.getLayout(anyInt(), anyInt())).thenReturn(layout);
         when(layout.layerAt(anyInt())).thenReturn(layer);
@@ -272,8 +273,21 @@ public class SavedBiomeCaptureTest {
         assertTrue(outsideOccupiedVolume);
     }
 
+    @SuppressWarnings("unchecked")
+    private static Engine captureEngine() {
+        Engine engine = mock(Engine.class, withSettings().stubOnly().mockMaker(MockMakers.PROXY));
+        IrisComplex complex = mock(IrisComplex.class, withSettings().stubOnly().defaultAnswer(RETURNS_DEEP_STUBS));
+        ProceduralStream<IrisRegion> regions = mock(ProceduralStream.class, withSettings().stubOnly());
+        ProceduralStream<IrisBiome> caves = mock(ProceduralStream.class, withSettings().stubOnly());
+        when(engine.getComplex()).thenReturn(complex);
+        when(engine.getSubterrainCell(anyInt(), anyInt(), anyInt())).thenReturn(SubterrainCell.OUTSIDE);
+        when(complex.getRegionStream()).thenReturn(regions);
+        when(complex.getCaveBiomeStream()).thenReturn(caves);
+        return engine;
+    }
+
     private static Engine caveCaptureEngine(IrisBiome surface, IrisBiome cave) {
-        Engine engine = mock(Engine.class, RETURNS_DEEP_STUBS);
+        Engine engine = captureEngine();
         when(engine.getComplex().getSubterrainPlanner()).thenReturn(null);
         IrisRegion region = region("flat-region");
         when(engine.getMinHeight()).thenReturn(-64);

core/src/test/java/art/arcane/iris/world/history/SavedBiomeRuntimeTest.java

@@ -35,6 +35,7 @@ import java.util.concurrent.TimeoutException;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
+import java.util.concurrent.locks.LockSupport;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -589,8 +590,14 @@ public class SavedBiomeRuntimeTest {
     }
 
     private static void awaitIdle(SavedBiomeRuntime runtime) {
-        Await.reached("the runtime to drain its pending queries", Duration.ofSeconds(5L),
-                () -> runtime.pendingQueryCount() == 0);
+        long deadline = System.nanoTime() + TimeUnit.SECONDS.toNanos(5L);
+        while (runtime.pendingQueryCount() != 0 && System.nanoTime() - deadline < 0L) {
+            LockSupport.parkNanos(TimeUnit.MILLISECONDS.toNanos(1L));
+            if (Thread.interrupted()) {
+                Thread.currentThread().interrupt();
+                throw new AssertionError("Interrupted while waiting for the runtime to drain its pending queries");
+            }
+        }
         assertEquals(0, runtime.pendingQueryCount());
     }
 

probe/src/main/java/art/arcane/iris/generation/runtime/ProbeBackgroundTasks.java

@@ -0,0 +1,17 @@
+package art.arcane.iris.generation.runtime;
+
+public final class ProbeBackgroundTasks {
+    private ProbeBackgroundTasks() {
+    }
+
+    public static void await(Engine engine) {
+        if (!(engine instanceof IrisEngine iris)) {
+            throw new IllegalArgumentException("Probe background barrier requires an Iris engine");
+        }
+        await(iris.backgroundTasks);
+    }
+
+    static void await(EngineBackgroundTasks tasks) {
+        tasks.drainBackgroundTasks("probe completion").requireComplete("probe completion");
+    }
+}

probe/src/main/java/art/arcane/iris/probe/GenerationOrderProbe.java

@@ -414,7 +414,7 @@ public final class GenerationOrderProbe {
                     ? generateParallel(session.engine(), scheduled, configuration)
                     : generateSequential(session.engine(), scheduled, configuration);
             long generationNanos = System.nanoTime() - started;
-            List<Throwable> reports = RealPackProbeSupport.settleAndDrain();
+            List<Throwable> reports = RealPackProbeSupport.settleAndDrain(session.engine());
             if (!reports.isEmpty()) {
                 RealPackProbeSupport.printReports(LOG_PREFIX, order + " generation reports", reports);
                 throw reportedFailure(order + " generation", reports);

probe/src/main/java/art/arcane/iris/probe/HydrologyPackProbe.java

@@ -3156,7 +3156,7 @@ public final class HydrologyPackProbe {
             }
             hydrologySeed = engine.getSeedManager().getBodies();
             engineReadyNanos = session.readyNanos();
-            List<Throwable> reports = RealPackProbeSupport.settleAndDrain();
+            List<Throwable> reports = RealPackProbeSupport.settleAndDrain(engine);
             if (!reports.isEmpty()) {
                 RealPackProbeSupport.printReports(LOG_PREFIX, "seed " + seed + " planning reports", reports);
                 throw reportedFailure("Hydrology coverage scan", reports);
@@ -4153,7 +4153,7 @@ public final class HydrologyPackProbe {
                     System.out.println(new GeneratedProcessResult(
                             witness.selector(), verification).machineLine());
                 }
-                List<Throwable> reports = RealPackProbeSupport.settleAndDrain();
+                List<Throwable> reports = RealPackProbeSupport.settleAndDrain(engine);
                 if (!reports.isEmpty()) {
                     RealPackProbeSupport.printReports(LOG_PREFIX, "generated chunk reports", reports);
                     throw reportedFailure("Hydrology generated chunk process", reports);

probe/src/main/java/art/arcane/iris/probe/RealPackProbeSupport.java

@@ -1,9 +1,11 @@
 package art.arcane.iris.probe;
 
 import art.arcane.iris.pack.loading.IrisData;
+import art.arcane.iris.generation.concurrent.MultiBurst;
 import art.arcane.iris.pack.PackValidationResult;
 import art.arcane.iris.pack.PackValidator;
 import art.arcane.iris.generation.runtime.IrisEngine;
+import art.arcane.iris.generation.runtime.ProbeBackgroundTasks;
 import art.arcane.iris.generation.runtime.Engine;
 import art.arcane.iris.generation.runtime.EngineAssignedComponent;
 import art.arcane.iris.generation.runtime.EngineEffects;
@@ -39,6 +41,7 @@ import java.util.EnumSet;
 import java.nio.file.Path;
 import java.nio.file.StandardCopyOption;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.LinkedHashMap;
@@ -46,6 +49,13 @@ import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ForkJoinPool;
+import java.util.concurrent.ForkJoinTask;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.locks.LockSupport;
 import java.util.stream.Stream;
 
 final class RealPackProbeSupport {
@@ -79,6 +89,7 @@ final class RealPackProbeSupport {
             validatePack(pack, logPrefix);
             return new Workspace(workRoot, pack, dimensionKey, logPrefix, false, bindings);
         } catch (Throwable failure) {
+            clearRuntime();
             Throwable cleanupFailure = deleteWorkRoot(workRoot);
             if (cleanupFailure != null) {
                 failure.addSuppressed(cleanupFailure);
@@ -103,6 +114,7 @@ final class RealPackProbeSupport {
             configureRuntime(new File(workRoot, "platform-validation"), hydrologyGeneratedVerification, null);
             return new Workspace(workRoot, pack, dimensionKey, logPrefix, hydrologyGeneratedVerification, null);
         } catch (Throwable failure) {
+            clearRuntime();
             Throwable cleanupFailure = deleteWorkRoot(workRoot);
             if (cleanupFailure != null) {
                 failure.addSuppressed(cleanupFailure);
@@ -120,7 +132,12 @@ final class RealPackProbeSupport {
         }
     }
 
-    static List<Throwable> settleAndDrain() throws InterruptedException {
+    static List<Throwable> settleAndDrain(Engine engine) throws InterruptedException {
+        if (IrisPlatforms.isBound() && IrisPlatforms.get() instanceof StubPlatform) {
+            ProbeBackgroundTasks.await(engine);
+            awaitGenerationWorkers();
+            return drainReported();
+        }
         List<Throwable> drained = new ArrayList<>();
         long quietSince = System.currentTimeMillis();
         long start = quietSince;
@@ -139,6 +156,54 @@ final class RealPackProbeSupport {
         return drained;
     }
 
+    private static void awaitGenerationWorkers() throws InterruptedException {
+        long deadline = System.nanoTime() + TimeUnit.SECONDS.toNanos(15);
+        List<ForkJoinPool> pools = new ArrayList<>(3);
+        for (MultiBurst burst : List.of(MultiBurst.hydrology, MultiBurst.ioBurst, MultiBurst.burst)) {
+            try {
+                ForkJoinPool pool = burst.submit((Callable<ForkJoinPool>) ForkJoinTask::getPool)
+                        .get(Math.max(1L, deadline - System.nanoTime()), TimeUnit.NANOSECONDS);
+                if (pool != null) {
+                    pools.add(pool);
+                }
+            } catch (ExecutionException | TimeoutException failure) {
+                throw new IllegalStateException("Probe generation worker barrier failed", failure);
+            }
+        }
+        long[] previous = quietWorkerSnapshot(pools, deadline);
+        while (true) {
+            long[] current = quietWorkerSnapshot(pools, deadline);
+            if (Arrays.equals(previous, current)) {
+                return;
+            }
+            previous = current;
+        }
+    }
+
+    private static long[] quietWorkerSnapshot(List<ForkJoinPool> pools, long deadline) throws InterruptedException {
+        long[] counts = new long[pools.size()];
+        for (int index = 0; index < pools.size(); index++) {
+            ForkJoinPool pool = pools.get(index);
+            while (true) {
+                if (Thread.interrupted()) {
+                    throw new InterruptedException("Probe generation worker barrier interrupted");
+                }
+                if (System.nanoTime() >= deadline) {
+                    throw new IllegalStateException("Probe generation workers did not settle within 15 seconds");
+                }
+                long count = pool.getStealCount();
+                boolean quiet = pool.isQuiescent();
+                long settledCount = pool.getStealCount();
+                if (quiet && count == settledCount) {
+                    counts[index] = settledCount;
+                    break;
+                }
+                LockSupport.parkNanos(TimeUnit.MICROSECONDS.toNanos(100));
+            }
+        }
+        return counts;
+    }
+
     static void printReports(String logPrefix, String label, List<Throwable> reports) {
         if (reports.isEmpty()) {
             return;
@@ -305,7 +370,7 @@ final class RealPackProbeSupport {
                     router.preloadActiveRuntimes();
                 }
                 long readyNanos = System.nanoTime() - started;
-                List<Throwable> initializationReports = settleAndDrain();
+                List<Throwable> initializationReports = settleAndDrain(engine);
                 printReports(logPrefix, runLabel + " engine-init reports", initializationReports);
                 if (bindings != null && !initializationReports.isEmpty()) {
                     IllegalStateException failure = new IllegalStateException("Native engine initialization reported failures");
@@ -317,6 +382,7 @@ final class RealPackProbeSupport {
                 return new EngineSession(this, data, engine, readyNanos);
             } catch (Throwable failure) {
                 Throwable cleanupFailure = closeResources(engine, data);
+                clearRuntime();
                 sessionOpen = false;
                 if (cleanupFailure != null) {
                     failure.addSuppressed(cleanupFailure);
@@ -347,8 +413,7 @@ final class RealPackProbeSupport {
                     failure = bindingFailure;
                 }
             }
-            IrisPlatforms.unbind();
-            StubPlatform.errorSink(null);
+            clearRuntime();
             Throwable cleanupFailure = deleteWorkRoot(workRoot);
             if (cleanupFailure != null) {
                 failure = appendFailure(failure, cleanupFailure);
@@ -494,6 +559,15 @@ final class RealPackProbeSupport {
         }
     }
 
+    private static void clearRuntime() {
+        IrisPlatforms.unbind();
+        IrisServices.remove(PreservationRegistry.class);
+        IrisServices.remove(EngineWorldManagerProvider.class);
+        IrisServices.remove(EngineEffectsProvider.class);
+        IrisServices.remove(EnginePlatformHooks.class);
+        StubPlatform.errorSink(null);
+    }
+
     private static void configureRuntime(File platformRoot, boolean hydrologyGeneratedVerification, RuntimeBindings bindings) {
         REPORTED.clear();
         StubPlatform.bindGenerationStateHandlers();

probe/src/main/java/art/arcane/iris/probe/Terrain3DProbe.java

@@ -328,7 +328,7 @@ public final class Terrain3DProbe {
                 sections.addAll(renderer.write());
             }
             topology = terrainTopology.inspect();
-            failReported("generation", RealPackProbeSupport.settleAndDrain());
+            failReported("generation", RealPackProbeSupport.settleAndDrain(engine));
         }
         List<String> failures = coverageFailures(evidence, configuration.requiredBiomes(), configuration.strictGeometry());
         Result result = new Result(failures.isEmpty() ? "PASS" : "FAIL", configuration, generatedChunks,

probe/src/main/java/art/arcane/iris/probe/TransitionProbe.java

@@ -121,7 +121,7 @@ public final class TransitionProbe {
             }
             require(historicalBiomes.equals(router.biomes().snapshot(0, 0).orElseThrow()),
                     "Historical biome data changed after generation");
-            for (Throwable failure : RealPackProbeSupport.settleAndDrain()) {
+            for (Throwable failure : RealPackProbeSupport.settleAndDrain(engine)) {
                 throw new IllegalStateException("Generation reported a failure", failure);
             }
             require(bindings.captures > 0, "Promotion did not capture historical terrain");

probe/src/test/java/art/arcane/iris/generation/runtime/ProbeBackgroundTasksTest.java

@@ -0,0 +1,131 @@
+package art.arcane.iris.generation.runtime;
+
+import art.arcane.iris.probe.StubPlatform;
+import art.arcane.iris.spi.IrisPlatforms;
+import art.arcane.iris.testsupport.IrisRuntimeState;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.concurrent.locks.LockSupport;
+
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertThrows;
+import static org.junit.Assert.assertTrue;
+
+public final class ProbeBackgroundTasksTest {
+    @Rule
+    public final TemporaryFolder temporary = new TemporaryFolder();
+
+    @Before
+    public void bindRuntime() {
+        IrisPlatforms.bind(new StubPlatform(temporary.getRoot()));
+    }
+
+    @After
+    public void resetRuntime() {
+        IrisRuntimeState.reset();
+        StubPlatform.errorSink(null);
+    }
+
+    @Test(timeout = 15_000L)
+    public void waitsForTrackedContinuationBeforeReturning() throws Exception {
+        EngineBackgroundTasks tasks = new EngineBackgroundTasks();
+        tasks.openBackgroundTaskAdmission();
+        CountDownLatch firstEntered = new CountDownLatch(1);
+        CountDownLatch firstRelease = new CountDownLatch(1);
+        CountDownLatch continuationEntered = new CountDownLatch(1);
+        CountDownLatch continuationRelease = new CountDownLatch(1);
+        try (ExecutorService closer = Executors.newSingleThreadExecutor()) {
+            try {
+                tasks.scheduleTrackedTask(() -> {
+                    awaitRelease(firstEntered, firstRelease);
+                    tasks.scheduleTrackedTask(() -> awaitRelease(continuationEntered, continuationRelease));
+                });
+                assertTrue(firstEntered.await(5, TimeUnit.SECONDS));
+                Future<?> completion = startDrain(closer, tasks);
+                assertThrows(TimeoutException.class, () -> completion.get(100, TimeUnit.MILLISECONDS));
+                firstRelease.countDown();
+                assertTrue(continuationEntered.await(5, TimeUnit.SECONDS));
+                assertThrows(TimeoutException.class, () -> completion.get(100, TimeUnit.MILLISECONDS));
+                continuationRelease.countDown();
+                completion.get(5, TimeUnit.SECONDS);
+            } finally {
+                firstRelease.countDown();
+                continuationRelease.countDown();
+            }
+        }
+    }
+
+    @Test(timeout = 15_000L)
+    public void propagatesAnAsynchronousTrackedFailure() throws Exception {
+        EngineBackgroundTasks tasks = new EngineBackgroundTasks();
+        tasks.openBackgroundTaskAdmission();
+        CountDownLatch entered = new CountDownLatch(1);
+        CountDownLatch release = new CountDownLatch(1);
+        IllegalStateException failure = new IllegalStateException("tracked generation failure");
+        CountDownLatch reported = new CountDownLatch(1);
+        StubPlatform.errorSink(error -> reported.countDown());
+        try (ExecutorService closer = Executors.newSingleThreadExecutor()) {
+            try {
+                tasks.scheduleTrackedTask(() -> {
+                    awaitRelease(entered, release);
+                    throw failure;
+                });
+                assertTrue(entered.await(5, TimeUnit.SECONDS));
+                Future<?> completion = startDrain(closer, tasks);
+                assertThrows(TimeoutException.class, () -> completion.get(100, TimeUnit.MILLISECONDS));
+                release.countDown();
+                ExecutionException observed = assertThrows(ExecutionException.class,
+                        () -> completion.get(5, TimeUnit.SECONDS));
+                assertSame(failure, observed.getCause().getCause().getCause());
+                assertTrue(reported.await(5, TimeUnit.SECONDS));
+            } finally {
+                release.countDown();
+            }
+        }
+    }
+
+    private static Future<?> startDrain(ExecutorService closer, EngineBackgroundTasks tasks) {
+        AtomicReference<Thread> drainingThread = new AtomicReference<>();
+        Future<?> completion = closer.submit(() -> {
+            drainingThread.set(Thread.currentThread());
+            ProbeBackgroundTasks.await(tasks);
+        });
+        long deadline = System.nanoTime() + TimeUnit.SECONDS.toNanos(5);
+        while (System.nanoTime() < deadline) {
+            Thread thread = drainingThread.get();
+            if (thread != null && thread.getState() == Thread.State.TIMED_WAITING) {
+                for (StackTraceElement frame : thread.getStackTrace()) {
+                    if (frame.getClassName().equals(EngineBackgroundTasks.class.getName())
+                            && frame.getMethodName().equals("drainBackgroundTasks")) {
+                        return completion;
+                    }
+                }
+            }
+            LockSupport.parkNanos(TimeUnit.MILLISECONDS.toNanos(1));
+        }
+        throw new AssertionError("Probe barrier did not await its initial task");
+    }
+
+    private static void awaitRelease(CountDownLatch entered, CountDownLatch release) {
+        entered.countDown();
+        try {
+            assertTrue(release.await(5, TimeUnit.SECONDS));
+        } catch (InterruptedException interruption) {
+            Thread.currentThread().interrupt();
+            throw new IllegalStateException(interruption);
+        }
+    }
+
+}

probe/src/test/java/art/arcane/iris/probe/ObjectContinuationProbeTest.java

@@ -211,7 +211,7 @@ public final class ObjectContinuationProbeTest {
                     assertArrayEquals(oldReceipt, SavedTerrainChunk.readReceipt(world.worldFolder().toPath(), 0, 0));
                     assertEquals(originalActivation, reopened.resolveActivation(0, 0).activationId());
                     assertTrue(reopened.semantics(1, 0).orElseThrow().objectKeys().contains(fixture.objectKey()));
-                    assertTrue("Generation must not report swallowed errors", RealPackProbeSupport.settleAndDrain().isEmpty());
+                    assertTrue("Generation must not report swallowed errors", RealPackProbeSupport.settleAndDrain(engine).isEmpty());
                 } finally {
                     engine.close();
                 }

probe/src/test/java/art/arcane/iris/probe/RealPackProbeSupportBarrierTest.java

@@ -0,0 +1,101 @@
+package art.arcane.iris.probe;
+
+import art.arcane.iris.generation.concurrent.MultiBurst;
+import art.arcane.iris.generation.runtime.EngineEffectsProvider;
+import art.arcane.iris.generation.runtime.EnginePlatformHooks;
+import art.arcane.iris.generation.runtime.EngineWorldManagerProvider;
+import art.arcane.iris.generation.runtime.PreservationRegistry;
+import art.arcane.iris.spi.IrisPlatforms;
+import art.arcane.iris.spi.IrisServices;
+import art.arcane.iris.testsupport.IrisRuntimeState;
+import art.arcane.iris.testsupport.PlatformLeakGuard;
+import art.arcane.iris.world.task.J;
+import org.junit.AfterClass;
+import org.junit.Test;
+
+import java.io.File;
+import java.net.URL;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertTrue;
+
+public final class RealPackProbeSupportBarrierTest {
+    @AfterClass
+    public static void resetRuntime() {
+        IrisRuntimeState.reset();
+    }
+
+    @Test
+    public void closesOwnedRuntimeServicesAndPreservesUnrelatedServices() throws Exception {
+        URL resource = RealPackProbeSupportBarrierTest.class.getResource("/seed-cohesion");
+        assertNotNull(resource);
+        IrisServices.register(String.class, "unrelated");
+        try {
+            try (RealPackProbeSupport.Workspace workspace = RealPackProbeSupport.openWorkspace(
+                    new File(resource.toURI()), "cohesion", "[workspace-cleanup]")) {
+                assertNotNull(IrisServices.getOrNull(EngineEffectsProvider.class));
+            }
+            assertFalse(IrisPlatforms.isBound());
+            assertNull(IrisServices.getOrNull(PreservationRegistry.class));
+            assertNull(IrisServices.getOrNull(EngineWorldManagerProvider.class));
+            assertNull(IrisServices.getOrNull(EngineEffectsProvider.class));
+            assertNull(IrisServices.getOrNull(EnginePlatformHooks.class));
+            assertEquals("unrelated", IrisServices.get(String.class));
+        } finally {
+            IrisServices.remove(String.class);
+        }
+    }
+
+    @Test(timeout = 30_000L)
+    public void waitsForCrossPoolContinuationsAndCollectsTheirErrors() throws Exception {
+        URL resource = RealPackProbeSupportBarrierTest.class.getResource("/seed-cohesion");
+        assertNotNull(resource);
+        try (RealPackProbeSupport.Workspace workspace = RealPackProbeSupport.openWorkspace(
+                new File(resource.toURI()), "cohesion", "[worker-barrier]");
+             RealPackProbeSupport.EngineSession session = workspace.openEngine(1337L, false, "barrier")) {
+            for (int repeat = 0; repeat < 40; repeat++) {
+                verifyCrossPoolContinuation(session, MultiBurst.ioBurst, MultiBurst.hydrology);
+                verifyCrossPoolContinuation(session, MultiBurst.hydrology, MultiBurst.ioBurst);
+            }
+        }
+        PlatformLeakGuard.requireClean("closed real-pack workspace", "end");
+    }
+
+    private static void verifyCrossPoolContinuation(RealPackProbeSupport.EngineSession session,
+                                                     MultiBurst first, MultiBurst second) throws Exception {
+        IllegalStateException failure = new IllegalStateException("nested generation failure");
+        CountDownLatch entered = new CountDownLatch(1);
+        CountDownLatch release = new CountDownLatch(1);
+        try {
+            first.lazy(() -> {
+                entered.countDown();
+                try {
+                    assertTrue(release.await(5, TimeUnit.SECONDS));
+                } catch (InterruptedException interruption) {
+                    Thread.currentThread().interrupt();
+                    throw new IllegalStateException(interruption);
+                }
+                Runnable failedTask = () -> {
+                    throw failure;
+                };
+                second.lazy(() -> first.lazy(() -> second.lazy(() -> J.a(failedTask))));
+            });
+            assertTrue(entered.await(5, TimeUnit.SECONDS));
+            release.countDown();
+            List<Throwable> reports = RealPackProbeSupport.settleAndDrain(session.engine());
+            assertEquals(1, reports.size());
+            assertSame(failure, reports.getFirst());
+            assertTrue(RealPackProbeSupport.drainReported().isEmpty());
+        } finally {
+            release.countDown();
+        }
+    }
+
+}