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Kotlin Multiplatform: testing a shared module supporting iOS and Android

Conceiving your app as modular can be greatly beneficial to your codebase’s health. In particular, designing a separation between your view and business logic can decrease the coupling between your layers and improve maintainability as well as testability. Tests are indeed your app’s best friends, as they can, at the same time, verify the code you wrote works as intended and act as a specification for the implemented functionality.

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Sharing frameworks between iOS and Android with Kotlin Multiplatform

Today we’ll see how to use Kotlin code to write a cross platform module that can be shared between an iOS and an Android app. Since the support for building iOS frameworks, introduced with Kotlin/Native 0.5 in December 2017, it has been possible to use the same code for creating libraries for both Android (.aar) and iOS (.framework). A couple of months later, Kotlin/Native 0.6 officially supports this use case, thanks to the support of Multiplatform, a new functionality focused on sharing code across platforms, introduced in the version 1.2 of the Kotlin language.

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Running a Kotlin/Native iOS app in the Simulator

Kotlin Native 0.4 is out since the beginning of November and, with it, some nice sample iOS demo apps to be run into your favourite iOS device. That sounds amazing, even for some hardcore Swift fans like me. Yet, there’s a catch: the sample apps can only run on a real iOS device but not in the Simulator. Sure, that’s just an unsignificant drawback compared to what the Kotlin Native team achieved so far. Still, I’m a huge fan of the iOS Simulator, as it’s by far the fastest way to do some quick testing of an app while doing a pretty good job in mimicking the behaviour of an app on a real device.

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