'Test the ability to retrieve a diff for a commit.'

def test_diff(self):

    cassette_name = self.cassette_name('diff')
    with self.recorder.use_cassette(cassette_name):
        repository = self.gh.repository('sigmavirus24', 'github3.py')
        commit = repository.commit('51cfbf8cbf98b0ba5006b3490f553bc05d4461e4')
        diff = commit.diff()
    assert diff
