pytest-sherlock

Pytest plugin which help to find coupled tests.

Sometimes we have coupled tests which depend from ordering

For example:

• PASSES tests/exmaple/test_all_read.py tests/exmaple/test_b_modify.py tests/exmaple/test_c_delete.py
• FAILED tests/exmaple/test_c_delete.py tests/exmaple/test_b_modify.py tests/exmaple/test_all_read.py

In this case pretty simple to detect coupled tests, but if we have >=1k tests which called before it will hard

Content:

• install
• how to use
• waiting in the future

Install

pip install pytest-sherlock

how to use:

pytest tests/exmaple/test_c_delete.py tests/exmaple/test_b_modify.py tests/exmaple/test_all_read.py --flaky-test="test_read_params" -vv

Plugin didn't run all tests, it try to find some possible guilty test and will run first

======================================================================================== test session starts ========================================================================================
collected 10 items                                                                                                                                                                                  
Try to find coupled tests

Step #1:
tests/exmaple/test_b_modify.py::test_modify_random_param PASSED                                                                                                                               [100%]
tests/exmaple/test_c_delete.py::test_delete_random_param PASSED                                                                                                                               [200%]
tests/exmaple/test_c_delete.py::test_deleted_passed PASSED                                                                                                                                    [300%]
tests/exmaple/test_c_delete.py::test_do_not_delete PASSED                                                                                                                                     [400%]
tests/exmaple/test_all_read.py::test_read_params COUPLED                                                                                                                                      [500%]
Step #2:
tests/exmaple/test_b_modify.py::test_modify_random_param PASSED                                                                                                                               [500%]
tests/exmaple/test_c_delete.py::test_delete_random_param PASSED                                                                                                                               [500%]
tests/exmaple/test_all_read.py::test_read_params COUPLED                                                                                                                                      [500%]
Step #3:
tests/exmaple/test_b_modify.py::test_modify_random_param PASSED                                                                                                                               [500%]
tests/exmaple/test_all_read.py::test_read_params COUPLED 

TODO

I have a couple ideas, how to improve finder coupled tests:

• use AST for detect common peace of code (variables, functions, etc...)
• Also need to add tests for it =)