code: public static String readMockResponse(Context context, String filePath) {
  
      String responseString;
      try {
        responseString = IOUtils.readFileFromAssets(context, filePath);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
      if (TextUtils.isEmpty(responseString)) {
        throw new RuntimeException("Mock file \"" + filePath + "\" is empty");
      }
  
      return responseString;
    }
docs: Reads mock response string from given path.
  
  @param context  Context with file access
  @param filePath Path to mock file
  @return Response string