def METHOD_NAME(self):
    """
    Tests that an invalid or missing enabled value raises an error response.
    """
    with self._setup_plugin_mock():
        response = self.client.patch(self.url, {"id": "app1"}, content_type="application/json")
    assert response.status_code == 400
    data = json.loads(response.content.decode("utf-8"))
    assert "developer_message" in data
    # Check that there is an issue with the enabled field
    assert "enabled" in data["developer_message"]