Say you are like me and work with ReSwift for unidirectional data flow goodness and employ RxSwift for your reactive cravings. You want to dispatch a ReSwift.Action when an RxSwift.Observable signal produces a new value. How do you write tests for that wiring? In code, it could look like this:
Xcode now offers two kinds of tests natively. You don’t have to rely on 3rd party JavaScript libraries anymore to automate the iOS simulator and assert view conditions. So with the advent of native UI Automation tests, can you rely on them to verify your app works? Here’s the two sides of the 1 criterion you’ll ever need to find out:
I have just discovered how cool the new guard statement is to keep unit tests lean and shallow – avoiding if-let nesting, that is. Update 2021-05-11: Modern XCTUnwrap is even better. Consider this test case: There are two optionals I have to deal with. That’s why I throw in assertions to cover problems. I don’t want to assert anything new here, though: the test helper soleFile() is valdiated in another test case already. But I need some kind of failure in case the Core Data test case goes nuts.
I’m writing unit tests for my Storyboard-based view controllers. Button interaction can be tested in view automation tests, but that’s slow, and it’s complicated, and it’s not even necessary for most cases. To write unit tests instead of UIAutomation tests for buttons, you test multiple things. Here are the tests.