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Tuist Test Selection is a good starting point. Running the tests affected by a change is already a substantial improvement over running every test on every merge. Its selection works at the target level: changes to a shared dependency can select tests in its consumers.
A typical iOS project based on the Combine framework at some point defines interfaces that are represented by ‘AnyPublisher’ or ‘AnySubscriber’.
Hey, today I would like to say a few words about my experiences with testing applications. It's a compilation of what I've tried so far with tests through many languages and technologies but especially related to the ones from Apple.
Some time ago, when I started working with Reactive Programming concept for developing iOS applications I struggled a lot with testing such products.
A Product Owner doesn’t see any business value in adding automated tests to a project - this problem concerns many projects and software developers.