Faking time because timing executions can be flaky on AppVeyor #1620
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On AppVeyor builds, we have observed some flakiness where timing a simple
Thread.Sleep(200)can result in up to 400 milliseconds of execution time. For those specific unit tests, we have decided to replaceStopwatchusage with a fake timer abstraction for those specific cases. For the other execution timing tests, I've decided to keep using the realStopwatch.Fixes #1085