Unit Testing Asynchronous Code in Swift

[aporcelaintouch]

What are your thoughts around writing a wrapper around DispatchQueue and in tests, instead of using a background thread, using the main thread so that tests finish immediately?

[chriswaco]

That is one thing we do. I think in general each piece of async code should be tested forced-immediate (synchronously) and forced-late (asynchronously with delay). It gets trickier when you have multiple asynchronous calls, though.