anchor.diff:  }
   
   class JSONTestRequest extends TestRequest<JSONTestResponse> {
  -  void set json(Map<String, dynamic> map) {
  +  void set json(dynamic map) {
       if (map != null) {
         body = JSON.encode(map);
       }
  
positive.code:   }
  
    bool hasKeys(List<String> keys) {
      for (var k in keys) {
        if (json[k] == null) {
          print("Expected $k in $json");
          return false;
        }
      }
  
negative.code:   }
  
    TestRequest request(String path) {
      TestRequest r = new TestRequest()
        ..host = this.host
        ..path = path;
      return r;
    }
  
  