Unit testing and integration testing are not mutually exclusive. I use both. I also want the feedback from tests/build of what I am developing to be as immediate as possible. Failing early with a test that takes a second to spool and run with a message like "expected File got Content" or whatever is more valuable than waiting for a much longer test for the same (or more obscure due to depth of stack that will need a debug session) message.

TL;DR: Running an entire webstack to test trivial things is waste.

> Just use testserver, it’s just a few lines of c# Code.

Orthoganol metric is orthoganol.

    await Task.Delay(TimeSpan.FromHours(1));

Is just one line of c#. Doesn't meant it's going to run any quicker.