def METHOD_NAME(self):
    """
    Test that we block a user who tries to link a second team to a
    channel that already has a team linked to it.
    """
    self.link_team()
    response = self.get_slack_response(
        {
            "text": "link team",
            "team_id": self.external_id,
            "user_id": self.slack_id,
            "channel_name": self.channel_name,
            "channel_id": self.channel_id,
        }
    )
    data = json.loads(str(response.content.decode("utf-8")))
    assert CHANNEL_ALREADY_LINKED_MESSAGE in get_response_text(data)