def METHOD_NAME(self):
    """Case when there is no text (spaces)"""
    data = {
        "participants": self.profile2.user.username,
        "title": "Test title",
        "subtitle": "Test subtitle",
        "text": " ",
    }
    form = PrivateTopicForm(self.profile1.user.username, data=data)
    self.assertFalse(form.is_valid())