class_docstr: RegisterInput tests
class_docstr_tok: ["RegisterInput","tests"]
docstr: RegisterInput - Get Payload Class
docstr_tok: ["RegisterInput","-","Get","Payload","Class"]
code: def test_get_payload_class(self):
      """RegisterInput - Get Payload Class"""
      class_type = RegisterInput._get_payload_class(self._service)
      assert_equal(self._class, class_type)
  
file_path: streamalert/tests/unit/streamalert/classifier/payload/test_payload_base.py
imports: import json
  from mock import patch
  from nose.tools import assert_equal
  from streamalert.classifier.payload.payload_base import RegisterInput, StreamPayload
label_desc: Use image node_id 4 for calling the TestRegisterInput obj's underlying member method code with example usage: obj.test_get_payload_class() without return types