test_file_io.py 文件源码

def test_wrap_non_iobase():
    class FakeFile:
        def close(self):  # pragma: no cover
            pass

        def write(self):  # pragma: no cover
            pass

    wrapped = FakeFile()
    assert not isinstance(wrapped, io.IOBase)

    async_file = trio.wrap_file(wrapped)
    assert isinstance(async_file, AsyncIOWrapper)

    del FakeFile.write

    with pytest.raises(TypeError):
        trio.wrap_file(FakeFile())