Forge biome modifier validation

- Pass the modded loader into the generation registry so biome modifier output stays out of validation
- Cover Forge modifiers on climate, attributes, effects and features against the canonical definition

adapters/forge/src/test/java/art/arcane/volmlib/nativelib/minecraft26_2/forge/NativeForgeBiomeDefinitionTest.java

@@ -0,0 +1,100 @@
+package art.arcane.volmlib.nativelib.minecraft26_2.forge;
+
+import art.arcane.volmlib.nativelib.minecraft26_2.terrain.NativeRegistryDefinitions;
+import art.arcane.volmlib.nativelib.modded.NativeLoaderOptions;
+import com.google.gson.JsonParser;
+import com.mojang.serialization.JsonOps;
+import com.mojang.serialization.Lifecycle;
+import com.mojang.serialization.MapCodec;
+import net.minecraft.SharedConstants;
+import net.minecraft.core.Holder;
+import net.minecraft.core.MappedRegistry;
+import net.minecraft.core.RegistrationInfo;
+import net.minecraft.core.RegistryAccess;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.Identifier;
+import net.minecraft.resources.RegistryOps;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.Bootstrap;
+import net.minecraft.world.attribute.EnvironmentAttributes;
+import net.minecraft.world.attribute.modifier.MobSpawnSettingsModifier;
+import net.minecraft.world.entity.EntityTypes;
+import net.minecraft.world.level.biome.Biome;
+import net.minecraft.world.level.biome.MobSpawnSettings;
+import net.minecraft.world.level.levelgen.GenerationStep;
+import net.minecraft.world.level.levelgen.carver.WorldCarver;
+import net.minecraft.world.level.levelgen.feature.Feature;
+import net.minecraft.world.level.levelgen.placement.PlacedFeature;
+import net.minecraftforge.common.world.BiomeModifier;
+import net.minecraftforge.common.world.ModifiableBiomeInfo;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.util.List;
+import java.util.function.BooleanSupplier;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.mock;
+
+public class NativeForgeBiomeDefinitionTest {
+    private static final String BIOME_REGISTRY = "minecraft:worldgen/biome";
+    private static final String BIOME_KEY = "iris:biomes/forge_modified";
+    private static final String SOURCE_JSON = "{\"has_precipitation\":true,\"temperature\":0.8,\"downfall\":0.4,"
+            + "\"effects\":{\"water_color\":\"#3f76e4\"},\"carvers\":[],\"features\":[]}";
+
+    @BeforeClass
+    public static void bootstrap() {
+        SharedConstants.tryDetectVersion();
+        Bootstrap.bootStrap();
+    }
+
+    @Test
+    public void generatedBiomeDefinitionExcludesForgeBiomeModifierOutput() {
+        MappedRegistry<PlacedFeature> features = new MappedRegistry<>(Registries.PLACED_FEATURE, Lifecycle.stable());
+        Holder.Reference<PlacedFeature> ore = features.register(
+                ResourceKey.create(Registries.PLACED_FEATURE, Identifier.parse("iris:modded_ore")),
+                new PlacedFeature(Holder.direct(mock(Feature.class)), List.of()),
+                RegistrationInfo.BUILT_IN);
+        features.freeze();
+        MappedRegistry<WorldCarver> carvers = new MappedRegistry<>(Registries.CARVER, Lifecycle.stable());
+        carvers.freeze();
+        MappedRegistry<Biome> biomes = new MappedRegistry<>(Registries.BIOME, Lifecycle.stable());
+        RegistryAccess access = new RegistryAccess.ImmutableRegistryAccess(List.of(biomes, features, carvers));
+        Biome source = Biome.DIRECT_CODEC.parse(RegistryOps.create(JsonOps.INSTANCE, access),
+                JsonParser.parseString(SOURCE_JSON)).getOrThrow();
+        Holder.Reference<Biome> biome = biomes.register(
+                ResourceKey.create(Registries.BIOME, Identifier.parse(BIOME_KEY)), source, RegistrationInfo.BUILT_IN);
+        biomes.freeze();
+        biome.value().modifiableBiomeInfo().applyBiomeModifiers(biome, List.of(new ModdedContent(ore)));
+        NativeRegistryDefinitions definitions = new NativeRegistryDefinitions(() -> access,
+                new NativeForgeLoader(new NativeLoaderOptions("irisworldgen", "treefeller",
+                        BooleanSupplier::getAsBoolean))::unmodifiedBiome);
+
+        assertEquals(0.1F, biome.value().getBaseTemperature(), 0.0F);
+        assertEquals(0x102030, biome.value().getWaterColor() & 0xFFFFFF);
+        assertTrue(biome.value().getGenerationSettings().hasFeature(ore.value()));
+        assertTrue(biome.value().getAttributes().contains(EnvironmentAttributes.NATURAL_MOB_SPAWNS));
+        assertEquals(JsonParser.parseString(definitions.canonicalDefinition(BIOME_REGISTRY, BIOME_KEY, SOURCE_JSON).value()),
+                JsonParser.parseString(definitions.generatedDefinition(BIOME_REGISTRY, BIOME_KEY).value()));
+    }
+
+    private record ModdedContent(Holder<PlacedFeature> ore) implements BiomeModifier {
+        @Override
+        public void modify(Holder<Biome> biome, Phase phase, ModifiableBiomeInfo.BiomeInfo.Builder builder) {
+            if (phase != Phase.ADD) {
+                return;
+            }
+            builder.climateSettings().setTemperature(0.1F);
+            builder.effects().waterColor(0x102030);
+            builder.attributes().modify(EnvironmentAttributes.NATURAL_MOB_SPAWNS, MobSpawnSettingsModifier.overlay(),
+                    new MobSpawnSettings.Builder().addSpawn(EntityTypes.ZOMBIE, 5, 1, 2).build());
+            builder.generationSettings().addFeature(GenerationStep.Decoration.UNDERGROUND_ORES, ore);
+        }
+
+        @Override
+        public MapCodec<? extends BiomeModifier> codec() {
+            throw new UnsupportedOperationException();
+        }
+    }
+}