def METHOD_NAME(self):
    responses.add(responses.POST, "http://example.com")
    self.plugin.notify(self.notification)
    assert len(responses.calls) == 1
    payload = json.loads(responses.calls[0].request.body)
    assert payload["level"] == "warning"
    assert payload["message"] == "Hello world"
    assert payload["event"]["id"] == self.event.event_id
    assert payload["event"]["event_id"] == self.event.event_id
    assert payload["triggering_rules"] == ["my rule"]