When writing pytest tests for a function that is supposed to print something to the console, to verify the output string I am using the capsys fixture and capsys.readouterr(). This is the code I am currently using: @pytest.mark.parametrize( "values,expected", [ ([], "guessed so far: \n"), (["single one"], "guessed so far: single one\n"), (["one", "two", "three", "4"], "guessed so far: 4, three, two, one\n"), ], ) def test_print_guesses(capsys, values: list, expected: str) -> None: hm.print_guesses(values) assert capsys.readouterr().out == expected I am also using the mypy extension in VS Code, so for now I am getting the warning: Function is missing a type annotation for one or more arguments I'd like to get rid of that. What is the appropriate type annotation for the capsys argument? Continue reading...
