While working on#130160 and#93096 it was decided that it would be worth paying attention to the problem of lack of tests for command line interface.

List of all cli modules is in the documentation:https://docs.python.org/dev/library/cmdline.html

Many modules are missing command line interface tests, so I suggest using this issue to submit PRs for now only for well-documented interfaces, for example:

• tokenize (gh-131178: Add tests fortokenize command-line interface #131274)
• platform (gh-131524: Update platform CLI to use argparse #131542)
• pickle (gh-131178: Add tests forpickle command-line interface #131275)
• ast (gh-131178: Add tests forast command-line interface #133329)
• pickletools (gh-131178: Add tests forpickletools command-line interface #131287)
• http.server (gh-131178: Add tests for http.server command-line interface #132540)
• profile (only has a test for successful/failure run)
• cProfile (only has a test for invalid input)
• site

TODO: Make sureall documented have tests for CLI (others are not so important as it has not been decided what to do with them yet)

You can use PR#127759 fordis module or#118132 forrandom module as a reference.
And I also suggest usingsubprocess.Popen to allocate a separate resource since some modules can block a lot of time.

Linked PRs

• gh-131178: Add tests fortokenize command-line interface #131274
• gh-131178: Add tests forpickle command-line interface #131275
• gh-131178: Add tests forpickletools command-line interface #131287
• gh-131178: Update help message fortimeit CLI #131326
• gh-131178: Add tests for http.server command-line interface #132540
• gh-131178: Add tests forast command-line interface #133329
• gh-131178: Add tests forsite command-line interface #133582
• gh-131178: Add CLI tests for profile module #134103
• gh-131178: fix SSL tests forhttp.server command-line interface #134224
• gh-131178: Add CLI tests for cProfile #134269
• gh-131178: fix SSL tests forhttp.server command-line interface #134279
• gh-131178: remove runtime tests forhttp.server CLI #134287