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Combining Autofac and Microsoft DI in unit tests

I had to write a test where I need to inject a configuration dependency through IOptions<>.  So far I had been using Autofac in my tests, so I wouldn’t go through all the trouble to get IOptions<> working inside Autofac (especially when Microsoft DI offers the convenient AddOptions<> and Configure<> methods).

Luckily it is not that hard to bring the 2 DI containers together. Here is the code I used inside my tests:

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