test_helpers.py 文件源码

def test_mkfs_ext4_no_contents(self):
        with ExitStack() as resources:
            tmpdir = resources.enter_context(TemporaryDirectory())
            results_dir = os.path.join(tmpdir, 'results')
            mock = MountMocker(results_dir)
            resources.enter_context(
                patch('ubuntu_image.helpers.run', mock.run))
            # Create a temporary directory, but this time without contents.
            contents_dir = resources.enter_context(TemporaryDirectory())
            # And a fake image file.
            img_file = resources.enter_context(NamedTemporaryFile())
            mkfs_ext4(img_file, contents_dir)
            # Because there were no contents, the `sudo cp` was never called,
            # the mock's shutil.copytree() was also never called, therefore
            # the results_dir was never created.
            self.assertFalse(os.path.exists(results_dir))