Dependency Injection for Testability
A Real-World Example 23 Nov 2018
This blog post describes, by way of a real-world example, how to use dependency injection to enable unit testing.
This blog post describes, by way of a real-world example, how to use dependency injection to enable unit testing.
This post presents a concise method of initializing UIImages without force-unwrapping.
My run-tracking app, RaceRunner, has features focused on racing and training for races. One of these features is alternate methods of ending runs. Here is an example.
The typical way to stop a run in a run-tracking app is to tap a button. RaceRunner supports this. But because of the physical exertion involved in running a race, a runner is sometimes in no condition to unlock an iPhone and tap a button at the end of a race. Even unlocking can be tricky because sweat often prevents TouchID from working, so instead the passcode must be tapped. So RaceRunner supports two alternative ways of ending a run. First, a run can stop automatically after a certain distance. This is great for time trials or if the runner does not trust the race organizers’ distance measurement. (A time trial involves running a certain distance, typically a race distance, as fast as possible.) Second, a spectator can use RaceRunner to stop the runner’s run. Both of these alternate means of stopping have problems. The certain-distance method may result in a recorded time that differs from actual time. The spectator method requires a cooperative spectator with an iPhone. So I implemented a third method: Siri.
Having just released a new version of RaceRunner with Siri support, I thought I’d share some learnings and pedagogic resources for other developers interested in implementing Siri support.