public void should_report_the_rate_of_change() {
var minute = TimeSpan.FromMinutes(1);
var config = new MetricConfig("counter1");
var clock = new StepClock(TimeSpan.FromMinutes(1));
var context = new MetricContext(clock);
var counter = new StepCounter(config, context);
clock.TickNow(1);
counter.Increment(10);
Measure measure = Testing.Sync<Measure>(counter, counter.GetMeasure,
counter.context_);
Assert.That(measure.Value, Is.EqualTo(10d/minute.Ticks));
counter.OnStep();
clock.TickNow(1);
counter.Increment(10);
measure = Testing.Sync<Measure>(counter, counter.GetMeasure,
counter.context_);
Assert.That(measure.Value, Is.EqualTo(10d/minute.Ticks),
"Should report the same value as previously, since the rate was the same.");
counter.OnStep();
clock.TickNow(1);
counter.Increment(20);
measure = Testing.Sync<Measure>(counter, counter.GetMeasure,
counter.context_);
Assert.That(measure.Value, Is.EqualTo(10d/minute.Ticks*2),
"Should report the double of the previously value, since the rate was doubled.");
}
