'Test the ability to iterate over milestone labels.'

def test_labels(self):

    cassette_name = self.cassette_name('labels')
    with self.recorder.use_cassette(cassette_name):
        issue = self.gh.issue('sigmavirus24', 'github3.py', 206)
        milestone = issue.milestone
        assert (milestone is not None)
        for label in milestone.labels():
            assert isinstance(label, github3.issues.label.Label)
