'Adds ``request_rate`` samples per call.'

def test_single_count(self):

    calls_per_second = 10
    clock = Clock()
    request = TestRequest()
    scenario = RequestLoadScenario(clock, request, request_rate=calls_per_second)
    scenario._request_and_measure(1)
    self.assertEqual(scenario.rate_measurer.get_metrics()['ok_count'], calls_per_second)
