Fix GameTestHelper#forEveryBlockInStructure including blocks that a…

…re not in the structure (neoforged#401)

patches/net/minecraft/gametest/framework/GameTestHelper.java.patch

@@ -0,0 +1,12 @@
+--- a/net/minecraft/gametest/framework/GameTestHelper.java
++++ b/net/minecraft/gametest/framework/GameTestHelper.java
+@@ -836,7 +_,8 @@
+
+     public void forEveryBlockInStructure(Consumer<BlockPos> p_177293_) {
+         AABB aabb = this.getRelativeBounds();
+-        BlockPos.MutableBlockPos.betweenClosedStream(aabb.move(0.0, 1.0, 0.0)).forEach(p_177293_);
++        // Neo: Shrink AABB by one as an aabb surrounding two blocks is increased by one compared to the actual positions
++        BlockPos.MutableBlockPos.betweenClosedStream(aabb.contract(1.0, 1.0, 1.0)).forEach(p_177293_);
+     }
+
+     public void onEachTick(Runnable p_177424_) {

tests/src/main/java/net/neoforged/neoforge/debug/structure/StructureTests.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) NeoForged and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.neoforged.neoforge.debug.structure;
+
+import net.minecraft.gametest.framework.GameTest;
+import net.minecraft.world.level.block.Blocks;
+import net.neoforged.testframework.DynamicTest;
+import net.neoforged.testframework.annotation.ForEachTest;
+import net.neoforged.testframework.annotation.TestHolder;
+import net.neoforged.testframework.gametest.StructureTemplateBuilder;
+
+@ForEachTest(groups = StructureTests.GROUP)
+public class StructureTests {
+    public static final String GROUP = "structure";
+
+    @GameTest
+    @TestHolder(description = "Tests that the structure bounds for use in Game Tests is correct")
+    static void everyBlockInStructure(final DynamicTest test) {
+        test.registerGameTestTemplate(() -> StructureTemplateBuilder.withSize(3, 3, 3)
+                .fill(0, 0, 0, 2, 2, 2, Blocks.DIAMOND_BLOCK));
+
+        test.onGameTest(helper -> helper.startSequence()
+                .thenWaitUntil(0, () -> helper.forEveryBlockInStructure(pos -> helper.assertBlockPresent(Blocks.DIAMOND_BLOCK, pos)))
+                .thenExecute(test::pass)
+                .thenSucceed());
+    }
+}