'If an invalid stream name is requested in get_messages, an error is
returned.'

def test_bad_narrow_stream_content(self):

    self.login(self.example_email('hamlet'))
    bad_stream_content = (0, [], ['x', 'y'])
    self.exercise_bad_narrow_operand('stream', bad_stream_content, "Bad    value    for    'narrow'")
