Add equality checking to each command node

src/test/java/net/minecraft/commands/tree/RootCommandNodeTest.java

@@ -1,9 +1,11 @@
 package net.minecraft.commands.tree;
 
+import com.google.common.testing.EqualsTester;
 import net.minecraft.commands.context.CommandContextBuilder;
 import org.junit.Before;
 import org.junit.Test;
 
+import static net.minecraft.commands.builder.LiteralArgumentBuilder.literal;
 import static org.hamcrest.Matchers.is;
 import static org.junit.Assert.assertThat;
 
@@ -18,6 +20,23 @@ public class RootCommandNodeTest {
     @Test
     public void testParse() throws Exception {
         assertThat(node.parse("foo bar baz", new CommandContextBuilder()), is("foo bar baz"));
+    }
 
+    @Test
+    public void testEquals() throws Exception {
+        new EqualsTester()
+            .addEqualityGroup(
+                new RootCommandNode(),
+                new RootCommandNode()
+            )
+            .addEqualityGroup(
+                new RootCommandNode() {{
+                    addChild(literal("foo").build());
+                }},
+                new RootCommandNode() {{
+                    addChild(literal("foo").build());
+                }}
+            )
+            .testEquals();
     }
 }