Well.. not for now at least let me just remove that-

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

@@ -1,62 +0,0 @@
-package art.arcane.iris.generation.runtime;
-
-import art.arcane.iris.generation.runtime.EngineEffects;
-import art.arcane.iris.generation.runtime.EngineMode;
-import art.arcane.iris.generation.runtime.EngineTarget;
-import art.arcane.iris.generation.runtime.EngineWorldManager;
-import art.arcane.iris.structure.object.ObjectPlaceMode;
-import org.junit.Test;
-
-import java.util.concurrent.CompletableFuture;
-
-import static org.junit.Assert.*;
-import static org.mockito.Mockito.mock;
-
-public class EnginePlacementLifecycleTest {
-    @Test
-    public void runtimeAssemblyResolvesBeforePublicationAndKeepsOldPlansIntact() {
-        var initial = assembly(1);
-        EngineRuntime previous = initial.freezeRuntime(new GenerationRuntime.BiomeMaxes(0, 0, 0));
-        var replacement = assembly(2);
-        EngineRuntime next = replacement.freezeRuntime(new GenerationRuntime.BiomeMaxes(0, 0, 0));
-
-        assertSame(initial.placementLifecycles, previous.generation().placementLifecycles());
-        assertSame(replacement.placementLifecycles, next.generation().placementLifecycles());
-        for (ObjectPlaceMode mode : ObjectPlaceMode.values()) {
-            assertNotNull(next.generation().placementLifecycles().get(mode));
-            assertNotSame(previous.generation().placementLifecycles().get(mode), next.generation().placementLifecycles().get(mode));
-        }
-        assertSame(initial.placementLifecycles, previous.generation().placementLifecycles());
-    }
-
-    @Test
-    public void complexReplacementCarriesNewPlansAlongsideTheNewComplex() {
-        var initial = assembly(1);
-        EngineRuntime previous = initial.freezeRuntime(new GenerationRuntime.BiomeMaxes(0, 0, 0));
-        var replacement = assembly(2);
-        EngineRuntime next = previous.withGeneration(previous.generation().withComplex(2, replacement.complex, null, null,
-                new GenerationRuntime.BiomeMaxes(1, 1, 1), replacement.placementLifecycles));
-
-        assertSame(replacement.placementLifecycles, next.generation().placementLifecycles());
-        assertSame(replacement.complex, next.generation().complex());
-        assertSame(previous.worldManager(), next.worldManager());
-        assertSame(initial.placementLifecycles, previous.generation().placementLifecycles());
-    }
-
-    private EngineRuntimeBuilder.RuntimeAssembly assembly(int id) {
-        EngineTarget target = mock(EngineTarget.class);
-        var world = mock(art.arcane.iris.world.IrisWorld.class);
-        org.mockito.Mockito.when(target.getWorld()).thenReturn(world);
-        org.mockito.Mockito.when(target.getData()).thenReturn(mock(art.arcane.iris.pack.loading.IrisData.class));
-        org.mockito.Mockito.when(target.getDimension()).thenReturn(mock(art.arcane.iris.generation.terrain.IrisDimension.class));
-        var assembly = new EngineRuntimeBuilder.RuntimeAssembly(id, target,
-                java.nio.file.Path.of("build", "test-mantles", "placement-" + id));
-        assembly.mantle = mock(art.arcane.iris.generation.mantle.EngineMantle.class);
-        assembly.complex = mock(IrisComplex.class);
-        assembly.effects = mock(EngineEffects.class);
-        assembly.mode = mock(EngineMode.class);
-        assembly.worldManager = mock(EngineWorldManager.class);
-        assembly.hash32 = CompletableFuture.completedFuture(0L);
-        return assembly;
-    }
-}

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

@@ -858,7 +858,7 @@ public class EngineShutdownDrainTest {
             when(generation.runtimeKernel()).thenReturn(kernel);
             GenerationRuntime nextGeneration = generation(target, mantle);
             when(nextGeneration.complex()).thenReturn(replacement);
-            when(generation.withComplex(anyInt(), same(replacement), isNull(), isNull(), any(), any()))
+            when(generation.withComplex(anyInt(), same(replacement), isNull(), isNull(), any()))
                     .thenReturn(nextGeneration);
             EngineRuntimeBuilder builder = spy(new EngineRuntimeBuilder(engine));
             doReturn(new GenerationRuntime.BiomeMaxes(0D, 0D, 0D)).when(builder).computeBiomeMaxes();

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

@@ -335,7 +335,6 @@ public class IrisEngineGenerationRuntimeScopeTest {
             assertSame(detached.dimension, engine.getDimension());
             assertSame(detached.runtime.seedManager(), engine.getSeedManager());
             assertSame(detached.complex, engine.getComplex());
-            assertSame(detached.runtime.placementLifecycles(), engine.getPlacementLifecycles());
             assertSame(detached.upperContext, engine.getUpperContext());
             assertSame(detached.dimensionStackContext, engine.getDimensionStackContext());
             assertSame(detached.mode, engine.getMode());
@@ -352,7 +351,6 @@ public class IrisEngineGenerationRuntimeScopeTest {
         assertSame(active.target, engine.getTarget());
         assertSame(active.data, engine.getData());
         assertSame(active.runtime.seedManager(), engine.getSeedManager());
-        assertSame(active.runtime.placementLifecycles(), engine.getPlacementLifecycles());
         assertSame(active.mantle, engine.getMantle());
         assertEquals(1, engine.getCacheID());
     }
@@ -1011,8 +1009,7 @@ public class IrisEngineGenerationRuntimeScopeTest {
                 mantle,
                 mantleStorageDirectory,
                 hash32,
-                new BiomeMaxes(objectDensity, layerDensity, decoratorDensity),
-                art.arcane.iris.structure.object.PlacementLifecycles.resolve());
+                new BiomeMaxes(objectDensity, layerDensity, decoratorDensity));
         return new RuntimeFixture(
                 runtime,
                 target,

core/src/test/java/art/arcane/iris/structure/object/IrisObjectPlacementLifecycleRegressionTest.java

@@ -271,7 +271,7 @@ public class IrisObjectPlacementLifecycleRegressionTest {
     }
 
     @Test
-    public void runnerUsesTheEnginePlanAndCompletesTheBlockPassBeforeAfterBlocks() {
+    public void customPlanCompletesTheBlockPassBeforeAfterBlocks() {
         RecordingPlacer placer = new RecordingPlacer(engine);
         PlacementLifecycleBuilder builder = new PlacementLifecycleBuilder();
         ObjectPlaceMode.CENTER_HEIGHT.install(builder);
@@ -280,11 +280,10 @@ public class IrisObjectPlacementLifecycleRegressionTest {
         List<Integer> finishedSizes = new ArrayList<>();
         builder.add(new PlacementLifecycleDependency("test.finished"), PlacementStage.AFTER_BLOCKS,
                 (context, state, ignored) -> finishedSizes.add(placer.writes().size()));
-        PlacementLifecycles plans = mock(PlacementLifecycles.class);
-        when(plans.get(ObjectPlaceMode.CENTER_HEIGHT)).thenReturn(builder.build());
-        when(engine.getPlacementLifecycles()).thenReturn(plans);
+        PlacementContext context = new PlacementContext(placement(), data, placer, null, new RNG(2L), lineObject(3),
+                0, 0, ANCHOR_Y, null);
 
-        assertEquals(ANCHOR_Y + 5, lineObject(3).place(0, ANCHOR_Y, 0, placer, placement(), new RNG(2L), data));
+        assertEquals(ANCHOR_Y + 5, builder.build().execute(context).heightOrRejected());
         assertEquals(List.of(3), finishedSizes);
         assertTrue(placer.writes().stream().allMatch(write -> write.y() == ANCHOR_Y + 5));
     }

core/src/test/java/art/arcane/iris/structure/object/PlacementLifecycleTest.java

@@ -98,7 +98,7 @@ public class PlacementLifecycleTest {
     }
 
     @Test
-    public void everyModeResolvesAndRuntimePlansAreIndependent() {
+    public void everyModeResolvesToIndependentPlans() {
         PlacementLifecycles first = PlacementLifecycles.resolve();
         PlacementLifecycles second = PlacementLifecycles.resolve();
         for (ObjectPlaceMode mode : ObjectPlaceMode.values()) {