def test_listdir(tmpdir):
"""
File storage returns a tuple containing directories and files.
"""
storage = FileSystemStorage(location=str(tmpdir))
assert not storage.exists("storage_test_1")
assert not storage.exists("storage_test_2")
assert not storage.exists("storage_dir_1")
storage.save("storage_test_1", io.StringIO("custom content"))
storage.save("storage_test_2", io.StringIO("custom content"))
os.mkdir(os.path.join(str(tmpdir), 'storage_dir_1'))
dirs, files = storage.listdir("")
assert set(dirs) == set(["storage_dir_1"])
assert set(files) == set(["storage_test_1", "storage_test_2"])
