def METHOD_NAME(self):
    data = '{"msg": "\u3053\u3093\u306b\u3061\u306f"}'
    expect = textwrap.dedent('''\
    {
        "msg": "\\u3053\\u3093\\u306b\\u3061\\u306f"
    }
    ''').encode()
    infile = self._create_infile(data)
    rc, out, err = assert_python_ok('-m', 'json.tool', infile)
    self.assertEqual(rc, 0)
    self.assertEqual(out.splitlines(), expect.splitlines())
    self.assertEqual(err, b'')