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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Bug in `regrtest` when name in `SPLITTESTDIRS` also matches a module name in tests","articleBody":"# Bug report\n\nDuring https://github.com/python/cpython/pull/109368 I tried to create `Lib/test/test_future/` directory. It did not go well:\n\n```\n» ./python.exe -m test test_future\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/runpy.py\", line 198, in _run_module_as_main\n    return _run_code(code, main_globals, None,\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/runpy.py\", line 88, in _run_code\n    exec(code, run_globals)\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/__main__.py\", line 2, in \u003cmodule\u003e\n    main()\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/main.py\", line 511, in main\n    Regrtest(ns).main(tests=tests)\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/main.py\", line 492, in main\n    selected, tests = self.find_tests(tests)\n                      ^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/main.py\", line 176, in find_tests\n    alltests = findtests(testdir=self.test_dir,\n               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/findtests.py\", line 45, in findtests\n    tests.extend(findtests(testdir=subdir, exclude=exclude,\n                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/findtests.py\", line 45, in findtests\n    tests.extend(findtests(testdir=subdir, exclude=exclude,\n                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/findtests.py\", line 38, in findtests\n    for name in os.listdir(testdir):\n                ^^^^^^^^^^^^^^^^^^^\nFileNotFoundError: [Errno 2] No such file or directory: '/Users/sobolev/Desktop/cpython/Lib/test/test_future/test_future'\n```\n\nI renamed `Lib/test/test_future/test_future.py` to `Lib/test/test_future/test_import_future.py`\nNow I get a new error (but similar):\n\n```\n» ./python.exe -m test test_future\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/runpy.py\", line 198, in _run_module_as_main\n    return _run_code(code, main_globals, None,\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/runpy.py\", line 88, in _run_code\n    exec(code, run_globals)\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/__main__.py\", line 2, in \u003cmodule\u003e\n    main()\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/main.py\", line 511, in main\n    Regrtest(ns).main(tests=tests)\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/main.py\", line 492, in main\n    selected, tests = self.find_tests(tests)\n                      ^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/main.py\", line 176, in find_tests\n    alltests = findtests(testdir=self.test_dir,\n               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/findtests.py\", line 45, in findtests\n    tests.extend(findtests(testdir=subdir, exclude=exclude,\n                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/findtests.py\", line 45, in findtests\n    tests.extend(findtests(testdir=subdir, exclude=exclude,\n                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/libregrtest/findtests.py\", line 38, in findtests\n    for name in os.listdir(testdir):\n                ^^^^^^^^^^^^^^^^^^^\nFileNotFoundError: [Errno 2] No such file or directory: '/Users/sobolev/Desktop/cpython/Lib/test/test_concurrent_futures/test_future'\n```\n\nThis looks like a bug to me.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-109403\n* gh-109404\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/sobolevn","@type":"Person","name":"sobolevn"},"datePublished":"2023-09-14T12:44:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/109402/cpython/issues/109402"}