public void WindowsPerformanceFacadeTest_VerifyDecrementSimple64()
{
int counterId = WindowsPerformanceFacade.GetPerformanceCounterId(CounterTestUtilities.TestCategoryName, null, CounterTestUtilities.TestCounterNumberOfItems64Name);
float initalValue = WindowsPerformanceFacade.NextValue(counterId);
WindowsPerformanceFacade.IncrementBy(counterId, 7);
WindowsPerformanceFacade.Decrement(counterId);
float finalValue = WindowsPerformanceFacade.NextValue(counterId);
Assert.AreEqual(initalValue + 6, finalValue);
}
public void WindowsPerformanceFacadeTest_VerifyDecrementAverageTimer32()
{
int counterId = WindowsPerformanceFacade.GetPerformanceCounterId(CounterTestUtilities.TestCategoryName, null, CounterTestUtilities.TestAverageTimer32Name);
WindowsPerformanceFacade.Increment(counterId);
WindowsPerformanceFacade.Increment(counterId);
WindowsPerformanceFacade.Decrement(counterId);
float finalValue = WindowsPerformanceFacade.NextValue(counterId);
//// ((N1 - N0) / F) / (B1 - B0)
//// how fast is our clock
float freq = Stopwatch.Frequency;
//// ((N1 - N0) / F)
float numerator = (1 - 2) / freq;
float denominator = 3 - 2;
Assert.AreEqual(numerator / denominator, finalValue, .002, "Freq: " + freq);
//// the final value is actually 0 here and our calculatd value is very small, almost -0
}
