code: def test_format_checker_none_on_constructor(self, app, client):
      self._setup_api_format_checker_tests(app)
  
      out = client.post_json("/format_checker/", {"ip": "192.168.1"})
      assert out == {}
  
imports: from __future__ import unicode_literals
  import flask_restplus
label_desc: Use image node_id 7 for calling the PayloadTest obj's underlying member method code with example usage: obj.test_format_checker_none_on_constructor(app, client) without return types