'Show that one can iterate over a PR\'s issue comments.'

def test_issue_comments(self):

    cassette_name = self.cassette_name('issue_comments')
    with self.recorder.use_cassette(cassette_name):
        p = self.get_pull_request()
        for comment in p.issue_comments():
            assert isinstance(comment, github3.issues.comment.IssueComment)
