public String param(String paramName) {
        return params.get(paramName);
    }
@Test
    void testRequestUrlParamAsUnknownClass() {
        RequestUrl requestUrl = new MatchUrl("/api/jobs/enqueued?offset=2&limit=2").toRequestUrl("/api/jobs/:state");
        assertThatIllegalArgumentException().isThrownBy(() -> requestUrl.param(":state", Object.class));
    }