Added testParseSimilar testcase to LiteralCommandNode

src/main/java/net/minecraft/commands/tree/LiteralCommandNode.java

@@ -19,15 +19,13 @@ public class LiteralCommandNode extends CommandNode {
 
     @Override
     public String parse(String command, CommandContextBuilder contextBuilder) throws IllegalArgumentSyntaxException, ArgumentValidationException {
-        if (!command.startsWith(literal)) {
+        String expected = literal + (command.length() > literal.length() ? " " : "");
+
+        if (!command.startsWith(expected)) {
             throw new IllegalArgumentSyntaxException();
         }
 
-        int start = literal.length();
+        int start = expected.length();
-        if (command.length() > start) {
+        return command.substring(start);
-            return command.substring(start + 1);
-        } else {
-            return "";
-        }
     }
 }

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

@@ -29,6 +29,11 @@ public class LiteralCommandNodeTest {
         assertThat(node.parse("foo", contextBuilder), is(""));
     }
 
+    @Test(expected = IllegalArgumentSyntaxException.class)
+    public void testParseSimilar() throws Exception {
+        node.parse("foobar", contextBuilder);
+    }
+
     @Test(expected = IllegalArgumentSyntaxException.class)
     public void testParseInvalid() throws Exception {
         node.parse("bar", contextBuilder);