@fluent<EOL><INDENT>def params(self, params):<DEDENT>
url = furl(self._request.rawurl)<EOL>url = url.add(params)<EOL>self._request.url = url.url<EOL>self.add_matcher(matcher('<STR_LIT>', params))<EOL>
Defines a set of URL query params to match.

Arguments:
    params (dict): set of params to match.

Returns:
    self: current Mock instance.