Parse into nested arguments

src/main/test/net/minecraft/commands/tree/LiteralCommandNodeTest.java

@@ -4,7 +4,9 @@ import net.minecraft.commands.exceptions.IllegalCommandArgumentException;
 import org.junit.Before;
 import org.junit.Test;
 
+import static net.minecraft.commands.arguments.IntegerArgumentType.integer;
 import static net.minecraft.commands.builder.CommandBuilder.command;
+import static net.minecraft.commands.builder.RequiredArgumentBuilder.argument;
 
 public class LiteralCommandNodeTest {
     LiteralCommandNode node;
@@ -23,4 +25,16 @@ public class LiteralCommandNodeTest {
     public void testParseInvalid() throws Exception {
         node.parse("bar");
     }
+
+    @Test
+    public void testParseChild() throws Exception {
+        node.addChild(argument("bar", integer()).build());
+
+        node.parse("foo 123");
+    }
+
+    @Test(expected = IllegalCommandArgumentException.class)
+    public void testParseNoChildren() throws Exception {
+        node.parse("foo 123");
+    }
 }