Fix #3 prevent dummies from getting the beacon advancement

src/main/java/io/github/misode/packtest/mixin/BeaconBlockEntityMixin.java

@@ -0,0 +1,30 @@
+package io.github.misode.packtest.mixin;
+
+import com.llamalad7.mixinextras.injector.ModifyExpressionValue;
+import com.llamalad7.mixinextras.sugar.Local;
+import io.github.misode.packtest.dummy.Dummy;
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.entity.BeaconBlockEntity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+import java.util.List;
+
+/**
+ * Prevents dummies from receiving the "Bring Home the Beacon" advancement
+ * due to the beacons used as part of the test status indicator
+ */
+@Mixin(BeaconBlockEntity.class)
+public class BeaconBlockEntityMixin {
+
+    @ModifyExpressionValue(method = "tick", at = @At(value = "INVOKE", target = "Lnet/minecraft/world/level/Level;getEntitiesOfClass(Ljava/lang/Class;Lnet/minecraft/world/phys/AABB;)Ljava/util/List;"))
+    private static <T> List<T> preventBeaconAdvancement(List<T> entities, @Local(argsOnly = true) Level level, @Local(argsOnly = true, ordinal = 0) BlockPos pos) {
+        BlockPos structurePos = pos.east().south().above(2);
+        if (level.getBlockState(structurePos).is(Blocks.STRUCTURE_BLOCK)) {
+            return entities.stream().filter(e -> !(e instanceof Dummy)).toList();
+        }
+        return entities;
+    }
+}

src/main/resources/packtest.mixins.json

@@ -4,6 +4,7 @@
   "compatibilityLevel": "JAVA_21",
   "mixins": [
     "ArgumentTypeInfosMixin",
+    "BeaconBlockEntityMixin",
     "BlockPredicateArgumentBlockMixin",
     "BlockPredicateArgumentMixin",
     "BlockPredicateArgumentTagMixin",