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ERROR: test_titles_displayed (rango.tests_chapter8.Chapter8ViewTests)
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Traceback (most recent call last):
  File "/Users/markglasgow/Documents/GitHub/semtwo/WAD/2018/Workspace/tango_with_django_project/rango/tests_chapter8.py", line 76, in test_titles_displayed
    self.assertIn('Add Category'.lower(), response.content.decode('ascii').lower())
  File "/Users/markglasgow/anaconda3/envs/rango/lib/python3.7/unittest/case.py", line 1105, in assertIn
    safe_repr(container))
TypeError: %b requires a bytes-like object, or an object that implements __bytes__, not 'str'