Using unittest and pytest to Write Automated Test Cases and Control Execution Order in Python

In software development, automated testing is essential. This project introduces how to use Python's unittest and pytest frameworks to write automated test cases and control their execution order.

Project Implementation

First, a test class and test methods are created using unittest:

import unittest
class Test(unittest.TestCase):
    def test_case1(self):
        # 第一个测试用例
        pass
    def test_case2(self):
        # 第二个测试用例
        pass

To control the order of execution, a test suite is built and test methods are added in the desired sequence:

if __name__ == '__main__':
    # 构建测试套件并指定执行顺序
    suite = unittest.TestSuite()
    suite.addTest(Test('test_case2'))
    suite.addTest(Test('test_case1'))
    # 执行测试套件
    runner = unittest.TextTestRunner()
    runner.run(suite)

Alternatively, the pytest framework can be used with the run marker to specify order:

import pytest
@pytest.mark.run(order=2)
def test_case1():
    # 第一个测试用例
    pass

@pytest.mark.run(order=1)
def test_case2():
    # 第二个测试用例
    pass

Using pytest.mark.run(order=N) allows explicit ordering of test cases, overriding the default alphabetical or file‑based ordering.

Conclusion

The project demonstrates how to write automated tests with unittest and pytest and how to control their execution order either by constructing a test suite or by applying the run marker. Mastering these techniques helps ensure reliable and maintainable test automation in Python projects.