When running https://ci.appveyor.com/project/dennisdoomen/fluentassertions/builds/34562293 for #1371
When_task_is_checking_synchronization_context_on_UI_thread_it_should_succeed failed.
I suspect it is because it uses a RealClock together with the timing sensitive CompleteWithin.
Can the intention of the test be implementation with a timing insensitive assertion?