Fix fuzzing tests sometimes hanging

Author: rubensworks

src/integrationtest/java/org/cyclops/integrateddynamics/gametest/GameTestsFuzzing.java

@@ -9,6 +9,8 @@
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.nbt.NbtIo;
 import net.minecraft.world.level.levelgen.structure.templatesystem.StructureTemplate;
+import net.neoforged.neoforge.common.NeoForge;
+import net.neoforged.neoforge.event.CommandEvent;
 import net.neoforged.neoforge.gametest.GameTestHolder;
 import net.neoforged.neoforge.gametest.PrefixGameTestTemplate;
 import org.apache.commons.compress.utils.Lists;
@@ -72,6 +74,13 @@ public Collection<TestFunction> testsFuzzedNetwork() {
         int fuzzingIterations = getFuzzingIterations();
         if (fuzzingIterations == 0) {
             IntegratedDynamics.clog(Level.INFO, "[Fuzzing] Disabled (FUZZING_ITERATIONS not set to a number)");
+        } else {
+            // TODO: check if this hack can be removed in the next MC update.
+            NeoForge.EVENT_BUS.addListener((CommandEvent event) -> {
+                // Block all commands, as the `test runclosest` command is being invoked for some reason,
+                // which causes GameTestTicker#clear to be invoked, which deadlocks the game test runner.
+                event.setCanceled(true);
+            });
         }
         for (int i = 0; i < fuzzingIterations; i++) {
             int finalI = i;

src/integrationtest/java/org/cyclops/integrateddynamics/gametest/fuzzing/NetworkFuzzer.java

@@ -746,8 +746,8 @@ private void placeDryingBasinWithFluid(BlockPos pos) {
     private void placeRandomBlock(BlockPos pos) {
         // Filter to only minecraft namespace blocks and get a random one
         var minecraftBlocks = BuiltInRegistries.BLOCK.stream()
-                .filter(block -> BuiltInRegistries.BLOCK.getKey(block)
-                        .getNamespace().equals("minecraft"))
+                .filter(block -> BuiltInRegistries.BLOCK.getKey(block).getNamespace().equals("minecraft"))
+                .filter(block -> !BuiltInRegistries.BLOCK.getKey(block).getPath().equals("command_block"))
                 .toList();
 
         if (!minecraftBlocks.isEmpty()) {