pytest - 测试 Flask API 方法的模拟异常

问题描述

我想使用 pytest 和 mock 对以下 Flask API 进行单元测试：

    #api.py
    @api.route("/get_job/<job_name>")
        class JobStatus(Resource):
            @api.marshal_with(m_res)
            def get(self,job_name):
                try:
                    job_status = gcp.generate_signed_url("bucket_name",blob_path)
                except ValueError as e:
                    try:
                        client = kube.SparkApplicationClient()
                        job_status = client.get(job_name)["status"]["applicationState"]["state"]
                    except ApiException as e:
                        abort(404,"job doesn't exist: %s\n" % e)
                return {"job_status": job_status}

我针对发送了两个异常但补丁不起作用的情况编写了以下测试：

    #test_api.py    
    import pytest
    from unittest.mock import patch,Magicmock
    from kubernetes.client.rest import ApiException
    from api import server
        
    @pytest.fixture
    def app():
        app = server.app
        return app
        
        
    @patch("api.gcp.generate_signed_url",Magicmock(side_effect=Exception(ValueError)))
    @patch("api.kube.SparkApplicationClient.get",Magicmock(side_effect=Exception(ApiException)))
    def test_get_job_status_doesnt_exists(client):
        response = client.get(
            "/api/get_job/68987af5-ccf4-4c11-a89a-d6645b7f7"
        )
        assert response.status_code == 404

基本上我试图让 gcp.generate_signed_url 和 client.get(job_name) 在测试时引发异常

谢谢！！！ :)

解决方法

试试：

@patch(
  "api.gcp.generate_signed_url",side_effect=ValueError)
)

还有：

@patch(
  "api.kube.SparkApplicationClient.get",**{
    'return_value.get.side_effect': ApiException
  }
)