服务端测试之PostMan自动生成测试脚本

Python测试实战

涵盖了客户端与服务端测试

作者本着在实践中学习，在学习中实践的思考模式，将理论知识与实际应用相结合，举出真实的案例，让读者学会举一反三。

在使用PosMan做服务端的自动化测试中，简单的地方在于也是工具，我们可以把测试用例加到一个Collection中，但是随着测试用例越来越多，以及工作的需求，我们需要把PostMan中的测试用例需要迁移到脚本的方式实现，平常的迁移思路是我们在脚本里面把之前的接口测试用例重新实现，这样相对而言它的成本是比较高的，特别是涉及的自动化测试用例特别多的时候。我们可以把Collection里面的测试用例导入出来，它是JSON的文件，然后我们解析这些JSON文件，让它自动的转成Python测试代码，从而轻松的完成这样的一个过程。被测试的API代码如下：

#!/usr/bin/env python
#!coding:utf-8
from flask import  Flask,jsonify
from flask_restful import  Api,Resource


app=Flask(__name__)
api=Api(app)

class LoginView(Resource):
   def get(self):
      return {'status':0,'msg':'ok','data':'this is a login page'}

   def post(self):
      parser=reqparse.RequestParser()
      parser.add_argument('username', type=str, required=True, help='用户名不能为空')
      parser.add_argument('password',type=str,required=True,help='账户密码不能为空')
      parser.add_argument('age',type=int,help='年龄必须为正正数')
      parser.add_argument('sex',type=str,help='性别只能是男或者女',choices=['女','男'])
      args=parser.parse_args()
      return jsonify(args)

api.add_resource(LoginView,'/login',endpoint='login')

if __name__ == '__main__':
   app.run(debug=True)

在PostMan里面创建Collection名称login，里面的接口测试用例具体如下：

在PostMan里面导出该Collection,命名为login.json,login.json文件的内容为：

{
   "info": {
      "_postman_id": "982a3108-6710-4a71-aaf8-e62a00d1813c",
      "name": "login",
      "schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
   },
   "item": [
      {
         "name": "校验用户名不能为空",
         "request": {
            "method": "POST",
            "header": [
               {
                  "key": "Content-Type",
                  "name": "Content-Type",
                  "value": "application/json",
                  "type": "text"
               }
            ],
            "body": {
               "mode": "raw",
               "raw": "{\n\t\"password\":\"admin\",\n\t\"sex\":\"男\",\n\t\"age\":18\n}",
               "options": {
                  "raw": {
                     "language": "json"
                  }
               }
            },
            "url": {
               "raw": "http://localhost:5000/login",
               "protocol": "http",
               "host": [
                  "localhost"
               ],
               "port": "5000",
               "path": [
                  "login"
               ]
            }
         },
         "response": []
      },
      {
         "name": "校验密码不能为空",
         "request": {
            "method": "POST",
            "header": [
               {
                  "key": "Content-Type",
                  "name": "Content-Type",
                  "value": "application/json",
                  "type": "text"
               }
            ],
            "body": {
               "mode": "raw",
               "raw": "{\n\t\"username\":\"wuya\",\n\t\"sex\":\"男\",\n\t\"age\":18\n}",
               "options": {
                  "raw": {
                     "language": "json"
                  }
               }
            },
            "url": {
               "raw": "http://localhost:5000/login",
               "protocol": "http",
               "host": [
                  "localhost"
               ],
               "port": "5000",
               "path": [
                  "login"
               ]
            }
         },
         "response": []
      },
      {
         "name": "校验性别参数不是男或者女",
         "request": {
            "method": "POST",
            "header": [
               {
                  "key": "Content-Type",
                  "name": "Content-Type",
                  "value": "application/json",
                  "type": "text"
               }
            ],
            "body": {
               "mode": "raw",
               "raw": "{\n\t\"username\":\"wuya\",\n\t\"password\":\"admin\",\n\t\"sex\":\"asdf\",\n\t\"age\":18\n}",
               "options": {
                  "raw": {
                     "language": "json"
                  }
               }
            },
            "url": {
               "raw": "http://localhost:5000/login",
               "protocol": "http",
               "host": [
                  "localhost"
               ],
               "port": "5000",
               "path": [
                  "login"
               ]
            }
         },
         "response": []
      },
      {
         "name": "校验年龄不是正整数",
         "request": {
            "method": "POST",
            "header": [
               {
                  "key": "Content-Type",
                  "name": "Content-Type",
                  "value": "application/json",
                  "type": "text"
               }
            ],
            "body": {
               "mode": "raw",
               "raw": "{\n\t\"username\":\"wuya\",\n\t\"password\":\"admin\",\n\t\"sex\":\"男\",\n\t\"age\":\"rrest\"\n}",
               "options": {
                  "raw": {
                     "language": "json"
                  }
               }
            },
            "url": {
               "raw": "http://localhost:5000/login",
               "protocol": "http",
               "host": [
                  "localhost"
               ],
               "port": "5000",
               "path": [
                  "login"
               ]
            }
         },
         "response": []
      },
      {
         "name": "校验登录成功",
         "request": {
            "method": "POST",
            "header": [
               {
                  "key": "Content-Type",
                  "name": "Content-Type",
                  "value": "application/json",
                  "type": "text"
               }
            ],
            "body": {
               "mode": "raw",
               "raw": "{\n\t\"username\":\"wuya\",\n\t\"password\":\"admin\",\n\t\"sex\":\"男\",\n\t\"age\":\"18\"\n}",
               "options": {
                  "raw": {
                     "language": "json"
                  }
               }
            },
            "url": {
               "raw": "http://localhost:5000/login",
               "protocol": "http",
               "host": [
                  "localhost"
               ],
               "port": "5000",
               "path": [
                  "login"
               ]
            }
         },
         "response": []
      }
   ],
   "protocolProfileBehavior": {}
}

本质上而言，它就是一个JSON文件，使用Python文件对它进行反序列化处理成字典数据类型，然后操作字典，这个过程相对来说不难，具体实现的代码如下：

#!/usr/bin/env python
#!coding:utf-8
import  requests
import  json
import  pytest


def operationJson():
   '''对login.json文件进行处理'''
   return json.load(open('login.json','r'))['item']

@pytest.mark.parametrize('datas',operationJson())
def test_api_login(datas):
   '''登录API的校验测试'''
   r=requests.request(
      method=datas['request']['method'],
      url=datas['request']['url']['raw'],
      json=json.loads(datas['request']['body']['raw']))
   print(json.dumps(r.json(),ensure_ascii=False))

if __name__ == '__main__':
   pytest.main(["-s","-v","test_login.py"])

使用Pytest框架的参数化几行代码就可以搞定了，当然断言需要单独的加。这个过程的思路其实非常简单，就是对JSON的文件处理成字典，然后利用Pytest框架的参数化来循环处理。当然可以把JSON文件简单的添加下断言，就更加智能化，添加的内容添加到response的里面内容，对login.json都在里面添加下验证点，完善后的文件内容为：

{
   "info": {
      "_postman_id": "982a3108-6710-4a71-aaf8-e62a00d1813c",
      "name": "login",
      "schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
   },
   "item": [
      {
         "name": "校验用户名不能为空",
         "request": {
            "method": "POST",
            "header": [
               {
                  "key": "Content-Type",
                  "name": "Content-Type",
                  "value": "application/json",
                  "type": "text"
               }
            ],
            "body": {
               "mode": "raw",
               "raw": "{\n\t\"password\":\"admin\",\n\t\"sex\":\"男\",\n\t\"age\":18\n}",
               "options": {
                  "raw": {
                     "language": "json"
                  }
               }
            },
            "url": {
               "raw": "http://localhost:5000/login",
               "protocol": "http",
               "host": [
                  "localhost"
               ],
               "port": "5000",
               "path": [
                  "login"
               ]
            }
         },
         "response":
         {
            "message": {
               "username": "用户名不能为空"
            }
         }
      },
      {
         "name": "校验密码不能为空",
         "request": {
            "method": "POST",
            "header": [
               {
                  "key": "Content-Type",
                  "name": "Content-Type",
                  "value": "application/json",
                  "type": "text"
               }
            ],
            "body": {
               "mode": "raw",
               "raw": "{\n\t\"username\":\"wuya\",\n\t\"sex\":\"男\",\n\t\"age\":18\n}",
               "options": {
                  "raw": {
                     "language": "json"
                  }
               }
            },
            "url": {
               "raw": "http://localhost:5000/login",
               "protocol": "http",
               "host": [
                  "localhost"
               ],
               "port": "5000",
               "path": [
                  "login"
               ]
            }
         },
         "response":
         {
            "message": {
               "password": "账户密码不能为空"
            }
         }
      },
      {
         "name": "校验性别参数不是男或者女",
         "request": {
            "method": "POST",
            "header": [
               {
                  "key": "Content-Type",
                  "name": "Content-Type",
                  "value": "application/json",
                  "type": "text"
               }
            ],
            "body": {
               "mode": "raw",
               "raw": "{\n\t\"username\":\"wuya\",\n\t\"password\":\"admin\",\n\t\"sex\":\"asdf\",\n\t\"age\":18\n}",
               "options": {
                  "raw": {
                     "language": "json"
                  }
               }
            },
            "url": {
               "raw": "http://localhost:5000/login",
               "protocol": "http",
               "host": [
                  "localhost"
               ],
               "port": "5000",
               "path": [
                  "login"
               ]
            }
         },
         "response":
         {
            "message": {
               "sex": "性别只能是男或者女"
            }
         }
      },
      {
         "name": "校验年龄不是正整数",
         "request": {
            "method": "POST",
            "header": [
               {
                  "key": "Content-Type",
                  "name": "Content-Type",
                  "value": "application/json",
                  "type": "text"
               }
            ],
            "body": {
               "mode": "raw",
               "raw": "{\n\t\"username\":\"wuya\",\n\t\"password\":\"admin\",\n\t\"sex\":\"男\",\n\t\"age\":\"rrest\"\n}",
               "options": {
                  "raw": {
                     "language": "json"
                  }
               }
            },
            "url": {
               "raw": "http://localhost:5000/login",
               "protocol": "http",
               "host": [
                  "localhost"
               ],
               "port": "5000",
               "path": [
                  "login"
               ]
            }
         },
         "response":
         {
            "message": {
               "age": "年龄必须为正正数"
            }
         }
      },
      {
         "name": "校验登录成功",
         "request": {
            "method": "POST",
            "header": [
               {
                  "key": "Content-Type",
                  "name": "Content-Type",
                  "value": "application/json",
                  "type": "text"
               }
            ],
            "body": {
               "mode": "raw",
               "raw": "{\n\t\"username\":\"wuya\",\n\t\"password\":\"admin\",\n\t\"sex\":\"男\",\n\t\"age\":\"18\"\n}",
               "options": {
                  "raw": {
                     "language": "json"
                  }
               }
            },
            "url": {
               "raw": "http://localhost:5000/login",
               "protocol": "http",
               "host": [
                  "localhost"
               ],
               "port": "5000",
               "path": [
                  "login"
               ]
            }
         },
         "response":
         {
            "age": 18,
            "password": "admin",
            "sex": "男",
            "username": "wuya"
         }
      }
   ],
   "protocolProfileBehavior": {}
}

继续完善测试代码，增加接口的断言，完善后的代码如下：

#!/usr/bin/env python
#!coding:utf-8
import  requests
import  json
import  pytest


def operationJson():
   '''对login.json文件进行处理'''
   return json.load(open('login.json','r'))['item']

@pytest.mark.parametrize('datas',operationJson())
def test_api_login(datas):
   '''登录API的校验测试'''
   # print(type(datas['response']))
   r=requests.request(
      method=datas['request']['method'],
      url=datas['request']['url']['raw'],
      json=json.loads(datas['request']['body']['raw']))
   assert r.json()==datas['response']

if __name__ == '__main__':
   pytest.main(["-s","-v","test_login.py"])

执行如上的测试代码，见如下图展示的执行结果信息：

依据如上，很轻松的实现了PostMan里面的接口测试用例自动的转成了Python的测试脚本，而且带了断言的信息。

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