def test_ls_abspath(self):
        """test 'ls' of data/ sibling dir with specified absolute path."""
        output = self.run_command("ls " + self.get_data_path(), exitcode=0)
        self.assertIn("file1.txt", output)
        self.assertIn("file2.txt", output)
        self.assertNotIn(".hidden", output)
test 'ls' of data/ sibling dir with specified absolute path.
tests/ls/test_ls.py