Mocking Dependencies With Generics

Elmar Kretzer (via Andy Bargh):

You can inject code dependencies in a transparent way by using generics and typealias.

[…]

Those dependencies are loosely coupled, but in my opinion they belong together in a semantic way.

[…]

We end up with:

• a generic ModelFor taking a type conforming to Environment
• a typealias Model representing ModelFor<RealWorld>
• no code necessary to manage the dependencies with properties or whatever

Craft Programming Swift Programming Language Testing

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