39-pytest-使用yaml文件编写测试用例

Posted 2022-10-27 爱学习de测试小白

使用yaml文件编写测试用例

• • • 前言
    • 项目结构
    • conftest.py
    • yaml文件
    • 执行并查看结果

---

前言

• 本篇来学习在pytest中使用yaml编写测试用例

项目结构

conftest.py

• 只需在 conftest.py 即可实现使用yaml编写测试用例

# -*- coding: utf-8 -*-
# @Time    : 2021/10/13
# @Author  : 大海

import jsonpath
import pytest
import requests

def pytest_collect_file(parent, file_path):
    if file_path.suffix == ".yaml" and file_path.name.startswith("test"):
        return YamlFile.from_parent(parent, path=file_path)


class YamlFile(pytest.File):
    def collect(self):
        import yaml
        yml_raw = self.fspath.open(encoding='utf-8').read()
        print('yml_raw', yml_raw)
        yml_var = Template(yml_raw).safe_substitute(os.environ)
        raw = yaml.safe_load(yml_var)
        print('raw', raw)
        for yaml_case in raw:
            name = yaml_case["test"]["name"]
            values = yaml_case["test"]
            yield YamlItem.from_parent(self, name=name, spec=values)


class YamlItem(pytest.Item):
    def __init__(self, name, parent, spec):
        super().__init__(name, parent)
        self.name = name
        self.values = spec
        self.request = self.values.get("request")
        self.validate = self.values.get("validate")
        self.s = requests.session()

    def values_render_variable(self, values):
        # 替换测试用例中的关联值
        yaml_test = Template(json.dumps(values)).safe_substitute(os.environ)
        values = yaml.safe_load(yaml_test)
        print('values', values)
        return values

    def runtest(self):
        values = self.values_render_variable(self.values)
        print('values:', values)
        request_data = values["request"]

        response = self.s.request(**request_data)
        print("响应数据：", response.text)

        # 判断是否有extract提取参数,实现参数关联
        if values.get("extract"):
            for key, value in values.get("extract").items():
                os.environ[key] = jsonpath.jsonpath(response.json(), value)[0]
                print('key', key)
                print('value', jsonpath.jsonpath(response.json(), value)[0])
        # 断言
        print('validate：', self.validate)
        self.assert_response(response, self.validate)

    def assert_response(self, response, validate):
        """自定义断言"""
        for i in validate:
            if "eq" in i.keys():
                yaml_result = i.get("eq")[0]
                actual_result = jsonpath.jsonpath(response.json(), yaml_result)
                expect_result = i.get("eq")[1]
                print("实际结果：%s" % actual_result[0])
                print("期望结果：%s" % expect_result)

                assert actual_result[0] == expect_result

yaml文件

• test_method.yaml

说明：
此yaml支持参数化

• extract ：提取关键字
  • name: 后面引用变量的key值
  • $.args.name：jsonpath 提取变量表达式

引用变量

• $name : $key

- test:
    name: get case
    request:
      url: https://postman-echo.com/get
      method: GET
      headers:
        Content-Type: application/json
        User-Agent: python-requests/2.18.4
      params:
        name: DH
        city: Beijing
    extract:
      name: $.args.name
    validate:
      - eq: [$.args.name, DH]
      - eq: [$.args.city, Beijing]
- test:
    name: post case
    request:
      url: https://postman-echo.com/post
      method: POST
      headers:
        Content-Type: application/json
        User-Agent: python-requests/2.18.4
      json:
        name: $name
        city: Beijing
    validate:
      - eq: [$.json.name, DH]
      - eq: [$.json.city, Beijing]

执行并查看结果

pytest -s -v