c# - 单元测试 : Custom Timer Assert

Question

我想为我的单元测试做一个自定义断言，它将测量两个 c# 函数的执行时间并比较它们。我已经编写了下面的代码，但是还有更好的方法吗？

public static class AssertExtensions
{
    public static void MoreSlowThan(Action slowFunction, Action fastFunction)
    {
        var watch = Stopwatch.StartNew();
        slowFunction();
        watch.Stop();
        var watchBis = Stopwatch.StartNew();
        fastFunction();
        watchBis.Stop();
        Assert.IsTrue(watch.ElapsedMilliseconds >= watchBis.ElapsedMilliseconds);
    }
}

调用者:

AssertExtensions.MoreSlowThan(() => MyFunction(), () => MyCachedFunction());

(目标是比较一个函数的执行时间和缓存中同一个函数的执行时间)

Answer 1

我发现最好的方法是用 MSTest-2 重构它，比如:

public static void IsFaster(this Assert assert, Action expectedFastAction, Action actualSlowAction)
{
    var slowStopwatch = Stopwatch.StartNew();
    actualSlowAction();
    slowStopwatch.Stop();

    var fastStopwatch = Stopwatch.StartNew();
    expectedFastAction();
    fastStopwatch.Stop();

    Assert.IsTrue(slowStopwatch.Elapsed >= fastStopwatch.Elapsed, string.Format("First function would be faster than the second. Fast function elapsed time : {0}. Slow function elapsed time : {1}", fastStopwatch.Elapsed, slowStopwatch.Elapsed));
}

并用 :

调用它

Assert.That.IsSlower(() => MyCachedFunction(), () => MyFunction());

谁有更好的办法