[Python] 選擇性的執行 pytest 的 Unit-test case
算是受到昨天 [Google Test] 選擇性的執行某些 Unit-test case 的啟發吧，
今天在跑 pytest 寫的 unit-test case 時，
突然也想到是不是有選項可以單跑某一個 test case…
當然如果是直接執行 py.test 的話，肯定是有選項的，
但我們的專案是自己寫一個 testproject.py，裡面呼叫了 pytest.main(args=sys.argv[1:])，
因此我從來沒有想過這個 testproject.py 其實繼承了 pytest 的命令列參數～
直接執行 testproject.py -h，果真跑出了 pytest 的選項：
testuser@localhost ~ $ python testproject.py -h usage: testproject.py [options] [file_or_dir] [file_or_dir] [...] positional arguments: file_or_dir general: -k EXPRESSION only run tests which match the given substring expression. An expression is a python evaluatable expression where all names are substring-matched against test names and their parent classes. Example: -k 'test_method or test other' matches all test functions and classes whose name contains 'test_method' or 'test_other'. Additionally keywords are matched to classes and functions containing extra names in their 'extra_keyword_matches' set, as well as functions which have names assigned directly to them. -m MARKEXPR only run tests matching given mark expression. example: -m 'mark1 and not mark2'. --markers show markers (builtin, plugin and per-project ones). -x, --exitfirst exit instantly on first error or failed test. --maxfail=num exit after first num failures or errors. --strict run pytest in strict mode, warnings become errors. -c file load configuration from `file` instead of trying to locate one of the implicit configuration files. --fixtures, --funcargs show available fixtures, sorted by plugin appearance --pdb start the interactive Python debugger on errors. --capture=method per-test capturing method: one of fd|sys|no. -s shortcut for --capture=no. --runxfail run tests even if they are marked xfail
像我想要單跑 test_set_data 這個 test case，可以加上 -k 選項：
testuser@localhost ~ python testproject.py -k test_set_data ========================= test session starts ========================== collected 101 items cmd/test_set.py::test_set_data[None-None-0] PASSED cmd/test_set.py::test_set_data[not_exist-None-123] PASSED =========== 99 tests deselected by '-ktest_set_data' ============ =============== 2 passed, 99 deselected in 0.88 seconds ===============
-k 選項裡面放的是部分字串，因此 -k set_data 可以跑所有名稱裡有 set_data 的 test case，
像是 test_set_data, test_set_data_aaa, test_bbb_set_data_ccc 都會跑到～
它還支援 or 的功能，例如 -k “aaa or bbb” 就可以去比對名稱中有 aaa 或是 bbb 的 test case，
蠻方便的喔～^^
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