def __init__(self, package, version):
        """Construct a new requirement.

        :param package: the package name.
        :param version: a semver compatible version specification.
        """
        self.package = package
        self.version = version
        if self.version and not re.match(r"[<=>~]", version[:2]):
            self.version = "=={}".format(self.version)
def test_login(self, mock_login_with_token, mock_input, mock_open_url):
        quilt3.login()

        url = quilt3.session.get_registry_url()

        mock_open_url.assert_called_with(f'{url}/login')
        mock_login_with_token.assert_called_with('123456')