Function test_warn_on_async_function

testing/acceptance_test.py:1154–1183

(pytester: Pytester)

@pytest.mark.filterwarnings("default::pytest.PytestUnhandledCoroutineWarning")
def test_warn_on_async_function(pytester: Pytester) -> None:
    # In the below we .close() the coroutine only to avoid
    # "RuntimeWarning: coroutine 'test_2' was never awaited"
    # which messes with other tests.
    pytester.makepyfile(
        test_async="""
        async def test_1():
            pass
        async def test_2():
            pass
        def test_3():
            coro = test_2()
            coro.close()
            return coro
    """
    )
    result = pytester.runpytest()
    result.stdout.fnmatch_lines(
        [
            "test_async.py::test_1",
            "test_async.py::test_2",
            "test_async.py::test_3",
            "*async def functions are not natively supported*",
            "*3 skipped, 3 warnings in*",
        ]
    )
    # ensure our warning message appears only once
    assert (
        result.stdout.str().count("async def functions are not natively supported") == 1
    )


@pytest.mark.filterwarnings("default::pytest.PytestUnhandledCoroutineWarning")