test_helpers.py 文件源码

def test_sparse_copy(self):
        with ExitStack() as resources:
            tmpdir = resources.enter_context(TemporaryDirectory())
            sparse_file = os.path.join(tmpdir, 'sparse.dat')
            fp = resources.enter_context(open(sparse_file, 'w'))
            os.truncate(fp.fileno(), 1000000)
            # This file is sparse.
            self.assertTrue(is_sparse(sparse_file))
            copied_file = os.path.join(tmpdir, 'copied.dat')
            sparse_copy(sparse_file, copied_file)
            self.assertTrue(is_sparse(copied_file))