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-rw-r--r--patches/server/1020-Add-FeatureFlag-API.patch428
1 files changed, 428 insertions, 0 deletions
diff --git a/patches/server/1020-Add-FeatureFlag-API.patch b/patches/server/1020-Add-FeatureFlag-API.patch
new file mode 100644
index 0000000000..c8da36ae78
--- /dev/null
+++ b/patches/server/1020-Add-FeatureFlag-API.patch
@@ -0,0 +1,428 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jake Potrebic <[email protected]>
+Date: Wed, 29 May 2024 19:50:21 -0700
+Subject: [PATCH] Add FeatureFlag API
+
+
+diff --git a/src/main/java/io/papermc/paper/world/flag/PaperFeatureDependent.java b/src/main/java/io/papermc/paper/world/flag/PaperFeatureDependent.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..c6fd2e8a570ac474dd1751929137280c52d79e78
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/world/flag/PaperFeatureDependent.java
+@@ -0,0 +1,17 @@
++package io.papermc.paper.world.flag;
++
++import java.util.Set;
++import net.minecraft.world.flag.FeatureElement;
++import org.bukkit.FeatureFlag;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.jetbrains.annotations.Unmodifiable;
++
++public interface PaperFeatureDependent extends FeatureDependant {
++
++ <M extends FeatureElement> M getHandle();
++
++ @Override
++ default @Unmodifiable @NonNull Set<FeatureFlag> requiredFeatures() {
++ return PaperFeatureFlagProviderImpl.fromNms(this.getHandle().requiredFeatures());
++ }
++}
+diff --git a/src/main/java/io/papermc/paper/world/flag/PaperFeatureFlagProviderImpl.java b/src/main/java/io/papermc/paper/world/flag/PaperFeatureFlagProviderImpl.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..d58b650fcafd04d00a92005ca8576d314535ce32
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/world/flag/PaperFeatureFlagProviderImpl.java
+@@ -0,0 +1,53 @@
++package io.papermc.paper.world.flag;
++
++import com.google.common.collect.BiMap;
++import com.google.common.collect.ImmutableBiMap;
++import java.util.Collections;
++import java.util.HashSet;
++import java.util.Set;
++import net.minecraft.world.flag.FeatureElement;
++import net.minecraft.world.flag.FeatureFlagSet;
++import net.minecraft.world.flag.FeatureFlags;
++import org.bukkit.FeatureFlag;
++import org.bukkit.craftbukkit.entity.CraftEntityType;
++import org.bukkit.craftbukkit.entity.CraftEntityTypes;
++import org.bukkit.craftbukkit.potion.CraftPotionType;
++import org.bukkit.craftbukkit.util.CraftMagicNumbers;
++import org.bukkit.entity.EntityType;
++import org.bukkit.potion.PotionType;
++
++public class PaperFeatureFlagProviderImpl implements FeatureFlagProvider {
++
++ public static final BiMap<FeatureFlag, net.minecraft.world.flag.FeatureFlag> FLAGS = ImmutableBiMap.of(
++ FeatureFlag.VANILLA, FeatureFlags.VANILLA,
++ FeatureFlag.BUNDLE, FeatureFlags.BUNDLE,
++ FeatureFlag.TRADE_REBALANCE, FeatureFlags.TRADE_REBALANCE
++ );
++
++ @Override
++ public Set<FeatureFlag> requiredFeatures(final FeatureDependant dependant) {
++ final FeatureFlagSet requiredFeatures = getFeatureElement(dependant).requiredFeatures();
++ return fromNms(requiredFeatures);
++ }
++
++ public static Set<FeatureFlag> fromNms(final FeatureFlagSet flagSet) {
++ final Set<FeatureFlag> flags = new HashSet<>();
++ for (final net.minecraft.world.flag.FeatureFlag nmsFlag : FeatureFlags.REGISTRY.names.values()) {
++ if (flagSet.contains(nmsFlag)) {
++ flags.add(FLAGS.inverse().get(nmsFlag));
++ }
++ }
++ return Collections.unmodifiableSet(flags);
++ }
++
++ static FeatureElement getFeatureElement(final FeatureDependant dependant) {
++ if (dependant instanceof final EntityType entityType) {
++ // TODO remove when EntityType is server-backed
++ return CraftEntityType.bukkitToMinecraft(entityType);
++ } else if (dependant instanceof final PotionType potionType) {
++ return CraftPotionType.bukkitToMinecraft(potionType);
++ } else {
++ throw new IllegalArgumentException(dependant + " is not a valid feature dependant");
++ }
++ }
++}
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftFeatureFlag.java b/src/main/java/org/bukkit/craftbukkit/CraftFeatureFlag.java
+deleted file mode 100644
+index da90e5c84a0cc4505a5fff0ed278a905978c6ce2..0000000000000000000000000000000000000000
+--- a/src/main/java/org/bukkit/craftbukkit/CraftFeatureFlag.java
++++ /dev/null
+@@ -1,51 +0,0 @@
+-package org.bukkit.craftbukkit;
+-
+-import java.util.HashSet;
+-import java.util.Set;
+-import net.minecraft.resources.ResourceLocation;
+-import net.minecraft.world.flag.FeatureFlagSet;
+-import net.minecraft.world.flag.FeatureFlags;
+-import org.bukkit.FeatureFlag;
+-import org.bukkit.NamespacedKey;
+-import org.bukkit.craftbukkit.util.CraftNamespacedKey;
+-import org.jetbrains.annotations.NotNull;
+-
+-public class CraftFeatureFlag implements FeatureFlag {
+-
+- private final NamespacedKey namespacedKey;
+- private final net.minecraft.world.flag.FeatureFlag featureFlag;
+-
+- public CraftFeatureFlag(ResourceLocation minecraftKey, net.minecraft.world.flag.FeatureFlag featureFlag) {
+- this.namespacedKey = CraftNamespacedKey.fromMinecraft(minecraftKey);
+- this.featureFlag = featureFlag;
+- }
+-
+- public net.minecraft.world.flag.FeatureFlag getHandle() {
+- return this.featureFlag;
+- }
+-
+- @NotNull
+- @Override
+- public NamespacedKey getKey() {
+- return this.namespacedKey;
+- }
+-
+- @Override
+- public String toString() {
+- return "CraftFeatureFlag{key=" + this.getKey() + ",keyUniverse=" + this.getHandle().universe.toString() + "}";
+- }
+-
+- public static Set<CraftFeatureFlag> getFromNMS(FeatureFlagSet featureFlagSet) {
+- Set<CraftFeatureFlag> set = new HashSet<>();
+- FeatureFlags.REGISTRY.names.forEach((minecraftkey, featureflag) -> {
+- if (featureFlagSet.contains(featureflag)) {
+- set.add(new CraftFeatureFlag(minecraftkey, featureflag));
+- }
+- });
+- return set;
+- }
+-
+- public static CraftFeatureFlag getFromNMS(NamespacedKey namespacedKey) {
+- return FeatureFlags.REGISTRY.names.entrySet().stream().filter(entry -> CraftNamespacedKey.fromMinecraft(entry.getKey()).equals(namespacedKey)).findFirst().map(entry -> new CraftFeatureFlag(entry.getKey(), entry.getValue())).orElse(null);
+- }
+-}
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
+index f0bd7d01f56bb792886354ca4f199e46c2cf7503..adc6741e0e017660fbd39a62b69be1e67e0e143f 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
+@@ -564,4 +564,11 @@ public abstract class CraftRegionAccessor implements RegionAccessor {
+ return !this.getHandle().noCollision(aabb);
+ }
+ // Paper end
++
++ // Paper start - feature flag API
++ @Override
++ public java.util.Set<org.bukkit.FeatureFlag> getFeatureFlags() {
++ return io.papermc.paper.world.flag.PaperFeatureFlagProviderImpl.fromNms(this.getHandle().enabledFeatures());
++ }
++ // Paper end - feature flag API
+ }
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index d3c845a997ad464cc25676443f567e6ada9ab360..125a427bd23df17773f50ecf8babc72f9502cba7 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -2379,10 +2379,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
+ return this.persistentDataContainer;
+ }
+
+- @Override
+- public Set<FeatureFlag> getFeatureFlags() {
+- return CraftFeatureFlag.getFromNMS(this.getHandle().enabledFeatures()).stream().map(FeatureFlag.class::cast).collect(Collectors.toUnmodifiableSet());
+- }
++ // Paper - replace feature flag API
+
+ public void storeBukkitValues(CompoundTag c) {
+ if (!this.persistentDataContainer.isEmpty()) {
+diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockType.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockType.java
+index 785d3fe4929e008d4150f3ecab258fd5b6d7cdaf..978e602c38d66c1ac219ffdfe82f9fc777a6ad26 100644
+--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockType.java
++++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockType.java
+@@ -33,7 +33,7 @@ import org.bukkit.craftbukkit.util.Handleable;
+ import org.bukkit.inventory.ItemType;
+ import org.jetbrains.annotations.NotNull;
+
+-public class CraftBlockType<B extends BlockData> implements BlockType.Typed<B>, Handleable<Block> {
++public class CraftBlockType<B extends BlockData> implements BlockType.Typed<B>, Handleable<Block>, io.papermc.paper.world.flag.PaperFeatureDependent { // Paper - feature flag API
+
+ private final NamespacedKey key;
+ private final Block block;
+diff --git a/src/main/java/org/bukkit/craftbukkit/generator/CraftWorldInfo.java b/src/main/java/org/bukkit/craftbukkit/generator/CraftWorldInfo.java
+index c81455a4ee9a3185f125ebf8cec325f4ed2e501d..8d962b055bd6574df7eb5510dd0efd67f579d84a 100644
+--- a/src/main/java/org/bukkit/craftbukkit/generator/CraftWorldInfo.java
++++ b/src/main/java/org/bukkit/craftbukkit/generator/CraftWorldInfo.java
+@@ -17,6 +17,7 @@ public class CraftWorldInfo implements WorldInfo {
+ private final long seed;
+ private final int minHeight;
+ private final int maxHeight;
++ private final net.minecraft.world.flag.FeatureFlagSet enabledFeatures; // Paper - feature flag API
+ // Paper start
+ private final net.minecraft.world.level.chunk.ChunkGenerator vanillaChunkGenerator;
+ private final net.minecraft.core.RegistryAccess.Frozen registryAccess;
+@@ -31,6 +32,7 @@ public class CraftWorldInfo implements WorldInfo {
+ this.seed = ((PrimaryLevelData) worldDataServer).worldGenOptions().seed();
+ this.minHeight = dimensionManager.minY();
+ this.maxHeight = dimensionManager.minY() + dimensionManager.height();
++ this.enabledFeatures = worldDataServer.enabledFeatures(); // Paper - feature flag API
+ }
+
+ @Override
+@@ -92,4 +94,11 @@ public class CraftWorldInfo implements WorldInfo {
+ };
+ }
+ // Paper end
++
++ // Paper start - feature flag API
++ @Override
++ public java.util.Set<org.bukkit.FeatureFlag> getFeatureFlags() {
++ return io.papermc.paper.world.flag.PaperFeatureFlagProviderImpl.fromNms(this.enabledFeatures);
++ }
++ // Paper end - feature flag API
+ }
+diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemType.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemType.java
+index d3f650d040afae8cb962696381c692cd7884bb4d..1b57649d0d3db24ed32c78cf3d5ce1d9fb1353e0 100644
+--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemType.java
++++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemType.java
+@@ -36,7 +36,7 @@ import org.bukkit.inventory.meta.ItemMeta;
+ import org.jetbrains.annotations.NotNull;
+ import org.jetbrains.annotations.Nullable;
+
+-public class CraftItemType<M extends ItemMeta> implements ItemType.Typed<M>, Handleable<Item> {
++public class CraftItemType<M extends ItemMeta> implements ItemType.Typed<M>, Handleable<Item>, io.papermc.paper.world.flag.PaperFeatureDependent { // Paper - feature flag API
+
+ private final NamespacedKey key;
+ private final Item item;
+diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMenuType.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMenuType.java
+index d658634ea4468c9dbfb29bc12282441c96358566..fbde94b72063da69cc1a1f7934e069c6c8c0f804 100644
+--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMenuType.java
++++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMenuType.java
+@@ -18,7 +18,7 @@ import org.bukkit.entity.HumanEntity;
+ import org.bukkit.inventory.InventoryView;
+ import org.bukkit.inventory.MenuType;
+
+-public class CraftMenuType<V extends InventoryView> implements MenuType.Typed<V>, Handleable<net.minecraft.world.inventory.MenuType<?>> {
++public class CraftMenuType<V extends InventoryView> implements MenuType.Typed<V>, Handleable<net.minecraft.world.inventory.MenuType<?>>, io.papermc.paper.world.flag.PaperFeatureDependent { // Paper - make FeatureDependant
+
+ private final NamespacedKey key;
+ private final net.minecraft.world.inventory.MenuType<?> handle;
+diff --git a/src/main/java/org/bukkit/craftbukkit/packs/CraftDataPack.java b/src/main/java/org/bukkit/craftbukkit/packs/CraftDataPack.java
+index 9525a7d4602b9b98dcc5e5e60dbcb628a656ae53..a0c0ad832726dcf9c8c25c1cfce2a6ddf770bf0f 100644
+--- a/src/main/java/org/bukkit/craftbukkit/packs/CraftDataPack.java
++++ b/src/main/java/org/bukkit/craftbukkit/packs/CraftDataPack.java
+@@ -11,7 +11,7 @@ import net.minecraft.util.InclusiveRange;
+ import org.bukkit.Bukkit;
+ import org.bukkit.FeatureFlag;
+ import org.bukkit.NamespacedKey;
+-import org.bukkit.craftbukkit.CraftFeatureFlag;
++// import org.bukkit.craftbukkit.CraftFeatureFlag; // Paper - replace feature flag API
+ import org.bukkit.craftbukkit.CraftServer;
+ import org.bukkit.craftbukkit.util.CraftChatMessage;
+ import org.bukkit.packs.DataPack;
+@@ -98,7 +98,7 @@ public class CraftDataPack implements DataPack {
+
+ @Override
+ public Set<FeatureFlag> getRequestedFeatures() {
+- return CraftFeatureFlag.getFromNMS(this.getHandle().getRequestedFeatures()).stream().map(FeatureFlag.class::cast).collect(Collectors.toUnmodifiableSet());
++ return io.papermc.paper.world.flag.PaperFeatureFlagProviderImpl.fromNms(this.getHandle().getRequestedFeatures()); // Paper - replace feature flag API
+ }
+
+ @Override
+diff --git a/src/main/java/org/bukkit/craftbukkit/potion/CraftPotionEffectType.java b/src/main/java/org/bukkit/craftbukkit/potion/CraftPotionEffectType.java
+index 6cf790c9fa23ea313423fdaeb7c181bf530828c6..0bcb9df1103050441f8922a688b163dc97c04591 100644
+--- a/src/main/java/org/bukkit/craftbukkit/potion/CraftPotionEffectType.java
++++ b/src/main/java/org/bukkit/craftbukkit/potion/CraftPotionEffectType.java
+@@ -13,7 +13,7 @@ import org.bukkit.potion.PotionEffectType;
+ import org.bukkit.potion.PotionEffectTypeCategory;
+ import org.jetbrains.annotations.NotNull;
+
+-public class CraftPotionEffectType extends PotionEffectType implements Handleable<MobEffect> {
++public class CraftPotionEffectType extends PotionEffectType implements Handleable<MobEffect>, io.papermc.paper.world.flag.PaperFeatureDependent { // Paper - feature flag API
+
+ public static PotionEffectType minecraftHolderToBukkit(Holder<MobEffect> minecraft) {
+ return CraftPotionEffectType.minecraftToBukkit(minecraft.value());
+diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+index 02745957a08a27af6a032453b8b20a8fed2911b3..293757b8e96ae7b0e807d807affa3fdab5181d39 100644
+--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
++++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+@@ -47,7 +47,7 @@ import org.bukkit.advancement.Advancement;
+ import org.bukkit.attribute.Attribute;
+ import org.bukkit.attribute.AttributeModifier;
+ import org.bukkit.block.data.BlockData;
+-import org.bukkit.craftbukkit.CraftFeatureFlag;
++// import org.bukkit.craftbukkit.CraftFeatureFlag; // Paper
+ import org.bukkit.craftbukkit.CraftRegistry;
+ import org.bukkit.craftbukkit.CraftServer;
+ import org.bukkit.craftbukkit.attribute.CraftAttribute;
+@@ -461,11 +461,7 @@ public final class CraftMagicNumbers implements UnsafeValues {
+ return CraftAttribute.bukkitToMinecraft(attribute).getDescriptionId();
+ }
+
+- @Override
+- public FeatureFlag getFeatureFlag(NamespacedKey namespacedKey) {
+- Preconditions.checkArgument(namespacedKey != null, "NamespaceKey cannot be null");
+- return CraftFeatureFlag.getFromNMS(namespacedKey);
+- }
++ // Paper - replace feature flag API
+
+ @Override
+ public PotionType.InternalPotionData getInternalPotionData(NamespacedKey namespacedKey) {
+diff --git a/src/main/resources/META-INF/services/io.papermc.paper.world.flag.FeatureFlagProvider b/src/main/resources/META-INF/services/io.papermc.paper.world.flag.FeatureFlagProvider
+new file mode 100644
+index 0000000000000000000000000000000000000000..c3e6b96013f6dd0b784bd867196552d97f3d8685
+--- /dev/null
++++ b/src/main/resources/META-INF/services/io.papermc.paper.world.flag.FeatureFlagProvider
+@@ -0,0 +1 @@
++io.papermc.paper.world.flag.PaperFeatureFlagProviderImpl
+diff --git a/src/main/resources/META-INF/services/io.papermc.paper.world.flag.FeatureFlags$FeatureFlagProvider b/src/main/resources/META-INF/services/io.papermc.paper.world.flag.FeatureFlags$FeatureFlagProvider
+new file mode 100644
+index 0000000000000000000000000000000000000000..c3e6b96013f6dd0b784bd867196552d97f3d8685
+--- /dev/null
++++ b/src/main/resources/META-INF/services/io.papermc.paper.world.flag.FeatureFlags$FeatureFlagProvider
+@@ -0,0 +1 @@
++io.papermc.paper.world.flag.PaperFeatureFlagProviderImpl
+diff --git a/src/test/java/io/papermc/paper/world/flag/FeatureFlagTest.java b/src/test/java/io/papermc/paper/world/flag/FeatureFlagTest.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..2e07ff04faa5999d14d29e44377deb4e483044a0
+--- /dev/null
++++ b/src/test/java/io/papermc/paper/world/flag/FeatureFlagTest.java
+@@ -0,0 +1,99 @@
++package io.papermc.paper.world.flag;
++
++import io.papermc.paper.adventure.PaperAdventure;
++import io.papermc.paper.registry.PaperRegistries;
++import io.papermc.paper.registry.RegistryAccess;
++import io.papermc.paper.registry.RegistryKey;
++import io.papermc.paper.registry.entry.RegistryEntry;
++import java.util.HashSet;
++import java.util.Set;
++import java.util.stream.Stream;
++import net.kyori.adventure.key.Key;
++import net.minecraft.resources.ResourceKey;
++import net.minecraft.resources.ResourceLocation;
++import net.minecraft.world.flag.FeatureElement;
++import net.minecraft.world.flag.FeatureFlagSet;
++import net.minecraft.world.flag.FeatureFlags;
++import org.bukkit.FeatureFlag;
++import org.bukkit.Keyed;
++import org.bukkit.support.RegistryHelper;
++import org.bukkit.support.environment.AllFeatures;
++import org.junit.jupiter.api.Test;
++import org.junit.jupiter.params.ParameterizedTest;
++import org.junit.jupiter.params.provider.MethodSource;
++
++import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
++import static org.junit.jupiter.api.Assertions.assertEquals;
++import static org.junit.jupiter.api.Assertions.assertFalse;
++import static org.junit.jupiter.api.Assertions.assertInstanceOf;
++import static org.junit.jupiter.api.Assertions.assertNotNull;
++import static org.junit.jupiter.api.Assertions.fail;
++
++@AllFeatures
++class FeatureFlagTest {
++
++ @Test
++ void testFeatureFlagParity() {
++ final Set<ResourceLocation> locations = new HashSet<>();
++ for (final FeatureFlag flag : FeatureFlag.ALL_FLAGS.values()) {
++ locations.add(PaperAdventure.asVanilla(flag.getKey()));
++ }
++ FeatureFlags.REGISTRY.fromNames(locations, unknown -> {
++ fail("Unknown api feature flag: " + unknown);
++ });
++
++ for (final ResourceLocation nmsFlag : allNames()) {
++ assertNotNull(FeatureFlag.ALL_FLAGS.value(Key.key(nmsFlag.toString())), "can't find api flag for " + nmsFlag);
++ }
++ }
++
++ @Test
++ void testFeatureFlagConversion() {
++ assertEquals(allNames().size(), PaperFeatureFlagProviderImpl.FLAGS.size());
++ for (final FeatureFlag featureFlag : PaperFeatureFlagProviderImpl.FLAGS.keySet()) {
++ final net.minecraft.world.flag.FeatureFlag nmsFlag = PaperFeatureFlagProviderImpl.FLAGS.get(featureFlag);
++ final ResourceLocation nmsFlagName = FeatureFlags.REGISTRY.toNames(FeatureFlagSet.of(nmsFlag)).iterator().next();
++ assertEquals(nmsFlagName.toString(), featureFlag.key().asString());
++ }
++ }
++
++ static Set<ResourceLocation> allNames() {
++ return FeatureFlags.REGISTRY.toNames(FeatureFlags.REGISTRY.allFlags());
++ }
++
++ @SuppressWarnings({"rawtypes", "unchecked"})
++ static Set<RegistryKey<?>> featureFilteredRegistries() {
++ final Set<RegistryKey<?>> registryKeys = new HashSet<>();
++ for (final ResourceKey filteredRegistry : FeatureElement.FILTERED_REGISTRIES) {
++ registryKeys.add(PaperRegistries.registryFromNms(filteredRegistry));
++ }
++ return registryKeys;
++ }
++
++ @MethodSource("featureFilteredRegistries")
++ @ParameterizedTest
++ <T extends Keyed> void testApiImplementsFeatureDependant(final RegistryKey<T> registryKey) {
++ final org.bukkit.Registry<T> registry = RegistryAccess.registryAccess().getRegistry(registryKey);
++ final T anyElement = registry.iterator().next();
++ assertInstanceOf(FeatureDependant.class, anyElement, "Registry " + registryKey + " doesn't have feature dependent elements");
++ final FeatureDependant dependant = ((FeatureDependant) anyElement);
++ assertDoesNotThrow(dependant::requiredFeatures, "Failed to get required features for " + anyElement + " in " + registryKey);
++ }
++
++ static Stream<RegistryKey<?>> nonFeatureFilteredRegistries() {
++ return RegistryHelper.getRegistry().registries().filter(r -> {
++ final RegistryEntry<?, ?> entry = PaperRegistries.getEntry(r.key());
++ // has an API registry and isn't a filtered registry
++ return entry != null && !FeatureElement.FILTERED_REGISTRIES.contains(r.key());
++ }).map(r -> PaperRegistries.getEntry(r.key()).apiKey());
++ }
++
++
++ @MethodSource("nonFeatureFilteredRegistries")
++ @ParameterizedTest
++ <T extends Keyed> void testApiDoesntImplementFeatureDependant(final RegistryKey<T> registryKey) {
++ final org.bukkit.Registry<T> registry = RegistryAccess.registryAccess().getRegistry(registryKey);
++ final T anyElement = registry.iterator().next();
++ assertFalse(anyElement instanceof FeatureDependant, "Registry " + registryKey + " has feature dependent elements");
++ }
++}