code: def test_that_explanation_works_for_complete():
      class CompleteExplanation(ExplanationMixin):
          _internal_object = {"overall": None, "specific": [None]}
          explanation_type = "performance"
          selector = None
          name = ""
  
          def visualize(self, key=None):
              data_dict = self.data(key)
              # NOTE: Return a fig|df|text|dash-component
              return str(data_dict)
  
          def data(self, key=None):
              if key is None:
                  return self._internal_object["overall"]
              return self._internal_object["specific"][key]
  
      try:
          explanation = CompleteExplanation()
          assert explanation.data() is None
          assert explanation.data(0) is None
          assert explanation.visualize(0) == str(None)
      except Exception as e:
          pytest.fail("Unexpected exception raised: {0}".format(e))
  
imports: import pytest
  from interpret.api.base import ExplainerMixin, ExplanationMixin
label_desc: Use image node_id 4 for calling a global function with example usage: test_that_explanation_works_for_complete() and returns: str, self, self