public static VerificationMode once() {
        return times(1);
    }
@Test
    public void should_verify_expected_request_for_once() throws Exception {
        final HttpServer server = httpServer(port(), hit);
        server.get(by(uri("/foo"))).response("bar");

        running(server, () -> assertThat(helper.get(remoteUrl("/foo")), is("bar")));

        hit.verify(by(uri("/foo")), once());
    }