public void GetNextAllowedCallTime_WhenNoPreviousCallsHaveBeenTracked_ShouldReturnZero()
{
var callTracker = new CallTracker();
var standardRateLimit = new StandardRateLimit(1, TimeSpan.FromSeconds(1));
var nextAllowedCallTime = standardRateLimit.GetNextAllowedCallTime(callTracker);
Assert.Equal(0, nextAllowedCallTime);
}
public void GetNextAllowedCallTime_WhenOnePreviousCallWasMadeMoreThanTimespanAgo_ReturnsZero(int lastCallMillisecondsAgo)
{
var currentDate = new DateTime(2018, 01, 01);
ReferenceTime.FreezeAtUtc(currentDate);
var callTracker = new CallTracker();
callTracker.CallWillHappenIn(-lastCallMillisecondsAgo);
var standardRateLimit = new StandardRateLimit(1, TimeSpan.FromMilliseconds(lastCallMillisecondsAgo - 100));
var nextAllowedCallTime = standardRateLimit.GetNextAllowedCallTime(callTracker);
Assert.Equal(0, nextAllowedCallTime);
ReferenceTime.Unfreeze();
}
public void GetNextAllowedCallTime_WhenOnePreviousCallTrackedForCurrentTime_ShouldBeNowPlusTimespanRange(int millisecondsTimespan)
{
var currentDate = new DateTime(2018, 01, 01);
ReferenceTime.FreezeAtUtc(currentDate);
var callTracker = new CallTracker();
callTracker.CallWillHappenIn(0);
var standardRateLimit = new StandardRateLimit(1, TimeSpan.FromMilliseconds(millisecondsTimespan));
var nextAllowedCallTime = standardRateLimit.GetNextAllowedCallTime(callTracker);
Assert.Equal(millisecondsTimespan, nextAllowedCallTime);
ReferenceTime.Unfreeze();
}
public void GetNextAllowedCallTime_ForTwoPreviousCalls_ReturnsCorrectTimespan()
{
var currentDate = new DateTime(2018, 01, 01);
ReferenceTime.FreezeAtUtc(currentDate);
var callTracker = new CallTracker();
callTracker.CallWillHappenIn(10);
callTracker.CallWillHappenIn(30);
var standardRateLimit = new StandardRateLimit(2, TimeSpan.FromMilliseconds(100));
var nextAllowedCallTime = standardRateLimit.GetNextAllowedCallTime(callTracker);
// 2 calls allowed every 100 milliseconds, so next call should be allowed in 110 milliseconds
Assert.Equal(110, nextAllowedCallTime);
ReferenceTime.Unfreeze();
}
