Function test_unregister_native_enum_when_destroyed

tests/test_native_enum.py:324–377

()

def test_unregister_native_enum_when_destroyed():
    # For stability when running tests in parallel, this test should be the
    # only one that touches `m.altitude` or calls `m.bind_altitude`.

    def test_altitude_enum():
        # Logic copied from test_enum_type / test_enum_members.
        # We don't test altitude there to avoid possible clashes if
        # parallelizing against other tests in this file, and we also
        # don't want to hold any references to the enumerators that
        # would prevent GCing the enum type below.
        assert isinstance(m.altitude, enum.EnumMeta)
        assert m.altitude.__module__ == m.__name__
        for name, value in ALTITUDE_MEMBERS:
            assert m.altitude[name].value == value

    def test_altitude_binding():
        assert m.is_high_altitude(m.altitude.high)
        assert not m.is_high_altitude(m.altitude.low)
        assert m.get_altitude() is m.altitude.high
        with pytest.raises(TypeError, match="incompatible function arguments"):
            m.is_high_altitude("oops")

    m.bind_altitude(m)
    test_altitude_enum()
    test_altitude_binding()

    if env.TYPES_ARE_IMMORTAL:
        pytest.skip("can't GC type objects on this platform")

    # Delete the enum type. Returning an instance from Python should fail
    # rather than accessing a deleted object.
    pytest.delattr_and_ensure_destroyed((m, "altitude"))
    with pytest.raises(TypeError, match="Unable to convert function return"):
        m.get_altitude()
    with pytest.raises(TypeError, match="incompatible function arguments"):
        m.is_high_altitude("oops")

    # Recreate the enum type; should not have any duplicate-binding error
    m.bind_altitude(m)
    test_altitude_enum()
    test_altitude_binding()

    # Remove the pybind11 capsule without removing the type; enum is still
    # usable but can't be passed to/from bound functions
    del m.altitude.__pybind11_native_enum__
    pytest.gc_collect()
    test_altitude_enum()  # enum itself still works

    with pytest.raises(TypeError, match="Unable to convert function return"):
        m.get_altitude()
    with pytest.raises(TypeError, match="incompatible function arguments"):
        m.is_high_altitude(m.altitude.high)

    del m.altitude