def test_ls_relpath_1(self):
        """test 'ls' of data/ sibling dir with specified relative path '.'."""
        output = self.run_command("ls .", exitcode=0)
        self.assertIn("file1.txt", output)
        self.assertIn("file2.txt", output)
        self.assertNotIn(".hidden", output)
test 'ls' of data/ sibling dir with specified relative path '.'.
tests/ls/test_ls.py