Fix .give and add a test for it

src/main/java/net/wurstclient/commands/GiveCmd.java

@@ -118,6 +118,7 @@ private boolean placeStackInHotbar(ItemStack stack)
 			if(!MC.player.getInventory().getStack(i).isEmpty())
 				continue;
 
+			MC.player.getInventory().main.set(i, stack);
 			MC.player.networkHandler.sendPacket(
 				new CreativeInventoryActionC2SPacket(36 + i, stack));
 			return true;

src/main/java/net/wurstclient/test/GiveCmdTest.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2014-2024 Wurst-Imperium and contributors.
+ *
+ * This source code is subject to the terms of the GNU General Public
+ * License, version 3. If a copy of the GPL was not distributed with this
+ * file, You can obtain one at: https://www.gnu.org/licenses/gpl-3.0.txt
+ */
+package net.wurstclient.test;
+
+import static net.wurstclient.test.WurstClientTestHelper.*;
+
+import net.minecraft.item.Items;
+
+public enum GiveCmdTest
+{
+	;
+
+	public static void testGiveCmd()
+	{
+		System.out.println("Testing .give command");
+		runChatCommand("clear");
+		runWurstCommand("give diamond");
+		assertOneItemInSlot(0, Items.DIAMOND);
+		runChatCommand("clear");
+	}
+}

src/main/java/net/wurstclient/test/WurstClientTestHelper.java

@@ -35,6 +35,9 @@
 import net.minecraft.client.resource.language.I18n;
 import net.minecraft.client.tutorial.TutorialStep;
 import net.minecraft.client.util.ScreenshotRecorder;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.wurstclient.WurstClient;
 
 public enum WurstClientTestHelper
 {
@@ -343,6 +346,7 @@ public static void clearChat()
 	 */
 	public static void runChatCommand(String command)
 	{
+		System.out.println("Running command: /" + command);
 		submitAndWait(mc -> {
 			ClientPlayNetworkHandler netHandler = mc.getNetworkHandler();
 
@@ -365,4 +369,30 @@ public static void runChatCommand(String command)
 			netHandler.sendChatCommand(command);
 		});
 	}
+
+	/**
+	 * Runs the given Wurst command, or fails after 10 seconds.
+	 *
+	 * <p>
+	 * Do not put a . at the start of the command.
+	 */
+	public static void runWurstCommand(String command)
+	{
+		System.out.println("Running command: ." + command);
+		submitAndWait(mc -> {
+			WurstClient.INSTANCE.getCmdProcessor().process(command);
+		});
+	}
+
+	public static void assertOneItemInSlot(int slot, Item item)
+	{
+		submitAndWait(mc -> {
+			ItemStack stack = mc.player.getInventory().getStack(slot);
+			if(!stack.isOf(item) || stack.getCount() != 1)
+				throw new RuntimeException(
+					"Expected 1 " + item.getName().getString() + " at slot "
+						+ slot + ", found " + stack.getCount() + " "
+						+ stack.getItem().getName().getString() + " instead");
+		});
+	}
 }

src/main/java/net/wurstclient/test/WurstE2ETestClient.java

@@ -99,7 +99,8 @@ private void runTests()
 		System.out.println("Checking for broken mixins");
 		MixinEnvironment.getCurrentEnvironment().audit();
 
-		// TODO: Test some Wurst hacks
+		GiveCmdTest.testGiveCmd();
+		// TODO: Test more Wurst hacks
 
 		System.out.println("Opening inventory");
 		openInventory();