Add test command handler to DummyInitializer test (#3970)

common/src/test/java/com/viaversion/viaversion/common/dummy/DummyInitializer.java

@@ -30,7 +30,7 @@ public final class DummyInitializer {
         }
 
         initialized = true;
-        Via.init(new ViaManagerImpl(new TestPlatform(), new TestInjector(), null, new TestLoader()));
+        Via.init(new ViaManagerImpl(new TestPlatform(), new TestInjector(), new TestCommandHandler(), new TestLoader()));
 
         final ViaManagerImpl manager = (ViaManagerImpl) Via.getManager();
         manager.init();

common/src/test/java/com/viaversion/viaversion/common/dummy/TestCommandHandler.java

@@ -0,0 +1,24 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.common.dummy;
+
+import com.viaversion.viaversion.commands.ViaCommandHandler;
+
+public class TestCommandHandler extends ViaCommandHandler {
+
+}