anchor.diff:        ..contentEditable = "false";
       textArea.classes.add('code-editor-text-area');
       target.children..add(runBtn)..add(output);
  -    if (options != null) this.options = options;
  +    this.options = options == null ? this.options : options;
       _editor = new CodeMirror.fromTextArea(textArea, options: this.options);
       output
         ..text = "output"
  
positive.code: import "fmt"
  
  func main() {
    fmt.Println("Hello, Go!")
  }""";
  
  const String startingJavaCode = """// Do not change the name of this class
  
negative.code:     'autoCloseTags': true,
      'mode': 'clike',
      'matchBrackets': true,
      'indentUnit': 4,
      'extraKeys': {
        'Ctrl-Space': 'autocomplete',
        'Cmd-/': 'toggleComment',
  