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I got a question regarding tests of the Ktor `HttpClient`: when testing the retry feature `HttpRequestRetry` I want my unit test to *not wait* in real time, but rather use a test scope with virtual time `runTest { ... }` but sadly, doing so with a `MockEngine` and this test scope, the retries still consume the complete real time it takes for it to do the repeated tries.

How can I get the `HttpClient`'s `HttpRequestRetry` feature to use virtual time instead?

I've had the same problem before; the only solution I found was to make a custom `MockEngine` implementation :disappointed:

I found a way to overwrite the delay function used by the HttpRequestRetry by a delay setting... But this adds code to the production code, which I think is bad... 
Would be better if it behaved differently when within a runTest block...

Please, vote for this feature: <https://youtrack.jetbrains.com/issue/KTOR-3571/Switch-to-coroutines-test-runTest-and-TestCoroutineScheduler|KTOR-3571>