test_ok2/testing/test_unraisableexception.py

import sys

from _pytest.pytester import Pytester
import pytest


PYPY = hasattr(sys, "pypy_version_info")


@pytest.mark.skipif(PYPY, reason="garbage-collection differences make this flaky")
@pytest.mark.filterwarnings("default::pytest.PytestUnraisableExceptionWarning")
def test_unraisable(pytester: Pytester) -> None:
    pytester.makepyfile(
        test_it="""
        class BrokenDel:
            def __del__(self):
                raise ValueError("del is broken")

        def test_it():
            obj = BrokenDel()
            del obj

        def test_2(): pass
        """
    )
    result = pytester.runpytest()
    assert result.ret == 0
    assert result.parseoutcomes() == {"passed": 2, "warnings": 1}
    result.stdout.fnmatch_lines(
        [
            "*= warnings summary =*",
            "test_it.py::test_it",
            "  * PytestUnraisableExceptionWarning: Exception ignored in: <function BrokenDel.__del__ at *>",
            "  ",
            "  Traceback (most recent call last):",
            "  ValueError: del is broken",
            "  ",
            "    warnings.warn(pytest.PytestUnraisableExceptionWarning(msg))",
        ]
    )


@pytest.mark.skipif(PYPY, reason="garbage-collection differences make this flaky")
@pytest.mark.filterwarnings("default::pytest.PytestUnraisableExceptionWarning")
def test_unraisable_in_setup(pytester: Pytester) -> None:
    pytester.makepyfile(
        test_it="""
        import pytest

        class BrokenDel:
            def __del__(self):
                raise ValueError("del is broken")

        @pytest.fixture
        def broken_del():
            obj = BrokenDel()
            del obj

        def test_it(broken_del): pass
        def test_2(): pass
        """
    )
    result = pytester.runpytest()
    assert result.ret == 0
    assert result.parseoutcomes() == {"passed": 2, "warnings": 1}
    result.stdout.fnmatch_lines(
        [
            "*= warnings summary =*",
            "test_it.py::test_it",
            "  * PytestUnraisableExceptionWarning: Exception ignored in: <function BrokenDel.__del__ at *>",
            "  ",
            "  Traceback (most recent call last):",
            "  ValueError: del is broken",
            "  ",
            "    warnings.warn(pytest.PytestUnraisableExceptionWarning(msg))",
        ]
    )


@pytest.mark.skipif(PYPY, reason="garbage-collection differences make this flaky")
@pytest.mark.filterwarnings("default::pytest.PytestUnraisableExceptionWarning")
def test_unraisable_in_teardown(pytester: Pytester) -> None:
    pytester.makepyfile(
        test_it="""
        import pytest

        class BrokenDel:
            def __del__(self):
                raise ValueError("del is broken")

        @pytest.fixture
        def broken_del():
            yield
            obj = BrokenDel()
            del obj

        def test_it(broken_del): pass
        def test_2(): pass
        """
    )
    result = pytester.runpytest()
    assert result.ret == 0
    assert result.parseoutcomes() == {"passed": 2, "warnings": 1}
    result.stdout.fnmatch_lines(
        [
            "*= warnings summary =*",
            "test_it.py::test_it",
            "  * PytestUnraisableExceptionWarning: Exception ignored in: <function BrokenDel.__del__ at *>",
            "  ",
            "  Traceback (most recent call last):",
            "  ValueError: del is broken",
            "  ",
            "    warnings.warn(pytest.PytestUnraisableExceptionWarning(msg))",
        ]
    )


@pytest.mark.filterwarnings("error::pytest.PytestUnraisableExceptionWarning")
def test_unraisable_warning_error(pytester: Pytester) -> None:
    pytester.makepyfile(
        test_it=f"""
        class BrokenDel:
            def __del__(self) -> None:
                raise ValueError("del is broken")

        def test_it() -> None:
            obj = BrokenDel()
            del obj
            {"import gc; gc.collect()" * PYPY}

        def test_2(): pass
        """
    )
    result = pytester.runpytest()
    assert result.ret == pytest.ExitCode.TESTS_FAILED
    assert result.parseoutcomes() == {"passed": 1, "failed": 1}