How to use the typeguard.TypeWarning function in typeguard

def test_check_call_args(self, checker: TypeChecker):
        def foo(a: int):
            pass

        with checker, pytest.warns(TypeWarning) as record:
            assert checker.active
            foo(1)
            foo('x')

        assert not checker.active
        foo('x')

        assert len(record) == 1
        warning = record[0].message
        assert warning.error == 'type of argument "a" must be int; got str instead'
        assert warning.func is foo
        assert isinstance(warning.stack, list)
        buffer = StringIO()
        warning.print_stack(buffer)
        assert len(buffer.getvalue()) > 100

def foo(a: int):
            pass

        def profiler(frame, event, arg):
            nonlocal profiler_run_count
            if event in ('call', 'return'):
                profiler_run_count += 1

            if old_profiler:
                old_profiler(frame, event, arg)

        profiler_run_count = 0
        old_profiler = sys.getprofile()
        sys.setprofile(profiler)
        try:
            with checker, pytest.warns(TypeWarning) as record:
                foo(1)
                foo('x')

            assert sys.getprofile() is profiler
        finally:
            sys.setprofile(old_profiler)

        assert profiler_run_count
        assert len(record) == 1