Fix Minecraft 1.12.2 machine state and strengthen regression tests

Author: SkyBlade1978

.gitignore

@@ -15,6 +15,12 @@
 /.idea/
 
 # Gradle and Forge run output
+**/build/
+**/.gradle/
+**/logs/
+**/.cache/
+**/__pycache__/
+**/.venv/
 /build/
 /.gradle/
 /eclipse/
@@ -28,6 +34,10 @@
 /.ci-dependencies/
 
 # Machine-specific agent context
+**/AGENTS.md
+**/AGENT.md
+**/agent-notes/
+**/.codex/
 /AGENTS.md
 /AGENT.md
 /agent-notes/

CHANGELOG.txt

@@ -1,3 +1,15 @@
+Unreleased test-coverage repairs for 1.12.2
+
+- Restore the missing carbon-dust recipe name from registered coal and charcoal powders, without replacing existing entries or changing recipe amounts.
+- Enable Forge's universal bucket during mod construction so oil buckets work without another mod enabling them first.
+- Stop steam, electricity and fluids from loading chunks or crossing an unloaded pipe section. Reconnect the network when that section loads again.
+- Keep refused energy available to the rest of the network instead of charging it to the source.
+- Check all conveyor destination slots, respect stack limits and preserve different item NBT.
+- Route overflow through the same insertion checks and save both inventories after transfers.
+- Stop the smeltable filter from accepting items whose furnace result is an empty stack.
+- Save changing timers and energy even when a machine has not sent a GUI update.
+- Add measured natural-tick jobs, negative controls and exact full-process restart comparisons.
+
 Power Advantage 2.4.1.112021
 
 - Restore conduit networks and machine GUI state after a world reload.

README.md

@@ -2,6 +2,8 @@
 
 Power Advantage provides shared power, fluid, and item transport systems for its Minecraft 1.12.2 expansion mods.
 
+The [test coverage backport notes](TEST-COVERAGE-BACKPORT.md#final-recorded-candidate) record the final machine, restart, control, partial-network, GUI, endurance, connected-world and reproducibility results alongside exact candidate hashes. The bounded legacy checks pass; the recipe progression graph is still partial. Earlier failures, modern follow-up findings and manual-testing limits are kept in the notes. This is not an all-machines or all-worlds guarantee.
+
 ## Building Minecraft 1.12.2
 
 The `master-1.12.2` build uses ForgeGradle 7.0.34 and Gradle 9.6.1. Run Gradle with Java 17; Gradle resolves the Java 8 toolchain used for compilation.

TEST-COVERAGE-BACKPORT.md

@@ -14,6 +14,21 @@ plugins {
     id 'net.minecraftforge.gradle' version '7.0.34'
 }
 
+sourceSets {
+    guiProbe {
+        java.srcDir 'test-rig/client-resources/java'
+        resources.srcDir 'test-rig/client-resources/resources'
+        compileClasspath += sourceSets.main.compileClasspath + sourceSets.main.output
+    }
+}
+
+tasks.register('clientResourceProbeJar', Jar) {
+    dependsOn tasks.named('guiProbeClasses')
+    from sourceSets.guiProbe.output
+    archiveFileName = 'advantageclientresources-deobf.jar'
+    destinationDirectory = layout.buildDirectory.dir('client-resource-probe')
+}
+
 group = project.mod_group
 version = project.mod_version
 base.archivesName = 'PowerAdvantage'
@@ -172,6 +187,7 @@ def rebornCoreCoordinate = usingStagedRebornCore
         : "RebornCore:RebornCore-1.12.2:${project.reborncore_version}:universal"
 
 dependencies {
+    testImplementation 'junit:junit:4.13.2'
     implementation minecraft.dependency(
             "net.minecraftforge:forge:${project.minecraft_version}-${project.forge_version}")
     // Mavenizer's legacy metadata omits this compile-time Minecraft library.

build.gradle

@@ -11,6 +11,7 @@
 import net.minecraft.item.ItemStack;
 import net.minecraft.tileentity.TileEntity;
 import net.minecraftforge.common.config.Configuration;
+import net.minecraftforge.fluids.FluidRegistry;
 import net.minecraftforge.fml.common.FMLLog;
 import net.minecraftforge.fml.common.Mod;
 import net.minecraftforge.fml.common.Mod.EventHandler;
@@ -216,6 +217,11 @@ compile files(
 		acceptedMinecraftVersions = "[1.12.2]")
 public class PowerAdvantage
 {
+	// Forge registers the bucket during its pre-init, before our fluid setup.
+	static {
+		FluidRegistry.enableUniversalBucket();
+	}
+
 	/** The identifier for this mod */
 	public static final String MODID = "poweradvantage";
 	/** The display name for this mod */

src/main/java/com/mcmoddev/poweradvantage/PowerAdvantage.java

@@ -5,17 +5,25 @@
 import net.minecraft.block.Block;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
+import net.minecraft.item.crafting.IRecipe;
 import net.minecraft.util.ResourceLocation;
+import net.minecraftforge.event.RegistryEvent;
 import net.minecraftforge.fml.common.FMLLog;
 import net.minecraftforge.fml.common.Loader;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.eventhandler.EventPriority;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
 import net.minecraftforge.fml.common.registry.ForgeRegistries;
 import net.minecraftforge.oredict.OreDictionary;
 import org.apache.logging.log4j.Level;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.util.List;
+import java.util.function.BiConsumer;
+import java.util.function.Function;
 
+@Mod.EventBusSubscriber(modid = PowerAdvantage.MODID)
 public final class BaseMetalsCompat {
 
 	private static final String MODID = "basemetals";
@@ -32,6 +40,26 @@ public static boolean isLoaded() {
 		return Loader.isModLoaded(MODID);
 	}
 
+	@SubscribeEvent(priority = EventPriority.HIGHEST)
+	public static void registerRecipeAliases(RegistryEvent.Register<IRecipe> event) {
+		// Item registration has finished; populate aliases before recipe factories inspect them.
+		registerCarbonDustFallback();
+	}
+
+	public static void registerCarbonDustFallback() {
+		registerCarbonDustFallback(OreDictionary::getOres, OreDictionary::registerOre);
+	}
+
+	static void registerCarbonDustFallback(Function<String, List<ItemStack>> ores,
+			BiConsumer<String, ItemStack> register) {
+		if (!ores.apply("dustCarbon").isEmpty()) return;
+		for (String source : new String[]{"dustCoal", "dustCharcoal"}) {
+			for (ItemStack stack : ores.apply(source)) {
+				if (stack != null && !stack.isEmpty()) register.accept("dustCarbon", stack.copy());
+			}
+		}
+	}
+
 	public static void setStrongHammers(boolean enabled) {
 		if (!isLoaded()) return;
 		if (setOldStrongHammers(enabled)) return;

src/main/java/com/mcmoddev/poweradvantage/compat/BaseMetalsCompat.java

@@ -13,6 +13,7 @@
 import com.mcmoddev.poweradvantage.util.PowerHelper;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.util.EnumFacing;
+import net.minecraft.util.math.ChunkPos;
 import net.minecraft.world.World;
 
 /**
@@ -124,18 +125,40 @@ public void invalidateAll() {
 	}
 
 	/**
-	 * Invalidates the cached network at a block location and then rescans the world to make a new
-	 * cached network
+	 * Invalidates networks crossing a changed chunk or touching its boundary.
+	 * Boundary networks must be rescanned when a pipe-only chunk returns.
 	 *
-	 * @param coord The block position that needs revalidating
-	 * @param w     The world instance for the same dimension as the coord
-	 * @param type  The energy type that is triggering the revalidation (should be the same type as
-	 *              this manager)
+	 * @param dimension dimension containing the changed chunk
+	 * @param chunk changed chunk position
+	 */
+	public void invalidateChunk(int dimension, ChunkPos chunk) {
+		lock.writeLock().lock();
+		try {
+			int minX = (chunk.x << 4) - 1;
+			int minZ = (chunk.z << 4) - 1;
+			for (BlockPos4D coord : new ArrayList<>(networkCache.keySet())) {
+				if (coord.dimension == dimension && coord.pos.getX() >= minX
+						&& coord.pos.getX() <= minX + 17 && coord.pos.getZ() >= minZ
+						&& coord.pos.getZ() <= minZ + 17) invalidate(coord);
+			}
+		} finally {
+			lock.writeLock().unlock();
+		}
+	}
+
+	/**
+	 * Rebuilds a network using only blocks already loaded in this world.
+	 *
+	 * @param coord origin of the network
+	 * @param w world containing the network
+	 * @param type conduit type being scanned
 	 */
 	public void revalidate(BlockPos4D coord, World w, ConduitType type) {
 		lock.writeLock().lock();
 		try {
 			invalidate(coord);
+			if (!w.isBlockLoaded(coord.pos)) return;
+			createNewNetwork(coord);
 			recursiveScan(w, coord, w.getBlockState(coord.pos), type);
 		} finally {
 			lock.writeLock().unlock();
@@ -172,7 +195,7 @@ protected void recursiveScan(World w, BlockPos4D coord, IBlockState src, Conduit
 		for (int i = 0; i < EnumFacing.values().length; i++) {
 			EnumFacing face = EnumFacing.values()[i];
 			BlockPos4D n = coord.offset(face);
-			if (areInSameNetwork(coord, n)) {
+			if (!w.isBlockLoaded(n.pos) || areInSameNetwork(coord, n)) {
 				continue;
 			}
 			IBlockState blockstate = w.getBlockState(n.pos);

src/main/java/com/mcmoddev/poweradvantage/conduitnetwork/ConduitNetworkManager.java

@@ -14,7 +14,11 @@
 import net.minecraft.tileentity.TileEntity;
 import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.ChunkPos;
 import net.minecraft.world.World;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.event.world.ChunkEvent;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
 
 import java.util.*;
 import java.util.concurrent.locks.Lock;
@@ -45,6 +49,7 @@ public static ConduitRegistry getInstance() {
 			try {
 				if (instance == null) {
 					instance = new ConduitRegistry();
+					MinecraftForge.EVENT_BUS.register(instance);
 				}
 			} finally {
 				initLock.unlock();
@@ -87,6 +92,7 @@ public List<PowerRequest> getRequestsForPower(World w, BlockPos coord, ConduitTy
 	 * priority.
 	 */
 	public List<PowerRequest> getRequestsForPower(World w, BlockPos coord, ConduitType conduitType, ConduitType energyType) {
+		if (!w.isBlockLoaded(coord)) return Collections.emptyList();
 		int dimension = w.provider.getDimension();
 		clearIfWorldChanged(w, dimension);
 		ConduitNetworkManager manager = getConduitNetworkManager(conduitType);
@@ -107,6 +113,7 @@ public List<PowerRequest> getRequestsForPower(World w, BlockPos coord, ConduitTy
 	private List<PowerRequest> collectRequests(World w, List<BlockPos4D> net, ConduitType conduitType, ConduitType energyType) {
 		List<PowerRequest> requests = new ArrayList<>();
 		for (BlockPos4D pos : net) {
+			if (!w.isBlockLoaded(pos.pos)) continue;
 			Block b = w.getBlockState(pos.pos).getBlock();
 			if (b instanceof ITileEntityProvider) {
 				TileEntity e = w.getTileEntity(pos.pos);
@@ -184,27 +191,29 @@ public static float transmitPowerToConsumers(
 			World world, BlockPos srcPos, Object providerInstance
 	) {
 		List<PowerRequest> requests = ConduitRegistry.getInstance().getRequestsForPower(world, srcPos, networkType, powerType);
+		return distributePower(availableEnergy, powerType, minimumPriority, world, providerInstance, requests);
+	}
+
+	static float distributePower(float availableEnergy, ConduitType powerType, byte minimumPriority,
+			World world, Object providerInstance, List<PowerRequest> requests) {
+		if (!Float.isFinite(availableEnergy) || availableEnergy <= 0) return 0;
 		float e = availableEnergy;
 		for (PowerRequest req : requests) {
-			if (req.amount <= 0) continue;
+			if (!Float.isFinite(req.amount) || req.amount <= 0) continue;
 			if (req.entity == providerInstance) continue;
 			if (req.priority < minimumPriority) continue;
 
+			float offered = Math.min(e, req.amount);
+			float accepted;
 			if (req instanceof ExternalPowerRequest) {
-				e -= LightWeightPowerRegistry.getInstance().addPower(world, ((ExternalPowerRequest) req).pos,
-						powerType, Math.min(e, req.amount));
-				if (e <= 0) break;
-				continue;
-			}
-
-			if (req.entity == null) continue;
-			if (req.amount < e) {
-				e -= req.entity.addEnergy(req.amount, powerType);
+				accepted = LightWeightPowerRegistry.getInstance().addPower(world, ((ExternalPowerRequest) req).pos,
+						powerType, offered);
 			} else {
-				req.entity.addEnergy(e, powerType);
-				e = 0;
-				break;
+				if (req.entity == null) continue;
+				accepted = req.entity.addEnergy(offered, powerType);
 			}
+			if (Float.isFinite(accepted)) e -= Math.max(0, Math.min(offered, accepted));
+			if (e <= 0) break;
 		}
 		return availableEnergy - e;
 	}
@@ -297,6 +306,29 @@ public void conduitBlockRemovedEvent(World w, int dimension, BlockPos location,
 		}
 	}
 
+	/** Clears networks crossing a changed chunk, including adjacent pipe-only boundaries. */
+	@SubscribeEvent
+	public void onChunkLoad(ChunkEvent.Load event) {
+		invalidateChunk(event);
+	}
+
+	/** Clears networks before an unloaded section can be used for another transfer. */
+	@SubscribeEvent
+	public void onChunkUnload(ChunkEvent.Unload event) {
+		invalidateChunk(event);
+	}
+
+	private void invalidateChunk(ChunkEvent event) {
+		World world = event.getWorld();
+		if (world.isRemote) return;
+		int dimension = world.provider.getDimension();
+		clearIfWorldChanged(world, dimension);
+		for (ConduitNetworkManager manager : networkManagers.values()) {
+			manager.invalidateChunk(dimension, new ChunkPos(
+					event.getChunk().x, event.getChunk().z));
+		}
+	}
+
 	private ConduitNetworkManager getConduitNetworkManager(ConduitType type) {
 		if (networkManagers.containsKey(type)) {
 			return networkManagers.get(type);

src/main/java/com/mcmoddev/poweradvantage/conduitnetwork/ConduitRegistry.java

@@ -37,6 +37,7 @@ public static void drawFluidBar(
 			FluidStack fs, float barHeight, int xPos, int yPos,
 			ResourceLocation displayImage, GUIContainer guiContainer, int x, int y, float zLevel
 	) {
+		barHeight = Float.isFinite(barHeight) ? Math.max(0F, Math.min(1F, barHeight)) : 0F;
 		final int w = 16;
 		final int barSlotHeight = 60;
 		final int h = (int) (barSlotHeight * barHeight);