Focus1337

@rasmus Hello. Can I take this issue and replace FluentAssertions with Shouldly in several Unit tests? For example, in the simplest ones. Replacing all tests with Shouldly at once is...

So, I was able to replace FluentAssertions in tests `Extensions`, `EventFlow.Tests`, `EventFlow.TestHelpers` (in whole project). Couldn't fully check for errors: `EventFlow.TestHelpers`, but changes in assertions seems to work. @rasmus I...