'Test the ability to add a label to an issue.'

def test_add_labels(self):

    self.token_login()
    cassette_name = self.cassette_name('add_labels')
    with self.recorder.use_cassette(cassette_name):
        issue = self.gh.issue(username='sigmavirus24', repository='github3.py', number=497)
        labels = issue.add_labels('in    progress')
    assert (len(labels) > 0)
    for label in labels:
        assert isinstance(label, github3.issues.issue.Label)
