code: def test_expect_validation_single_resource_success(self, app, client):
      self._setup_expect_validation_single_resource_tests(app)
  
      # Input payload is a valid JSON object
      out = client.post_json("/validation/", {"username": "alice"})
      assert {} == out
  
imports: from __future__ import unicode_literals
  import flask_restplus
label_desc: Use image node_id 16 for calling the PayloadTest obj's underlying member method code with example usage: obj.test_expect_validation_single_resource_success(app, client) without return types