Hey there! I know we can run Kotlin Multiplatform ...

# multiplatform

[Marc Reichelt]

Hey there! I know we can run Kotlin Multiplatform tests on iOS simulators. Can we also run them on real iOS devices? I’d really love to test some Bluetooth-related code in an automated fashion!

[Johann Pardanaud]

You can perfectly run your Kotlin code on real iOS devices, that’s the goal actually. 😄

[Marc Reichelt]

Yes, I know that - the question is if this works from unit tests ;)

[Johann Pardanaud]

Sorry, I missed that important part, and I don’t know the answer to that. 😅

[vanniktech]

./gradlew iosSimulatorArm64Test is what I'm doing although its not perfect. Does not work with CC / sqldelight

[Marc Reichelt]

Yeah, that all runs on a simulator. I’m looking for how to run these on a real device 🙂

[jw]

Tests are just normal binaries that you can run anywhere

[Marc Reichelt]

Well - I'll see if I can get it working with Kotlin multiplatform / Native. I didn't find any resource how to do that yet

[jw]

Once I get to a computer I can try to look

[Marc Reichelt]

Oh, you might be right! I can call ./gradlew linkDebugTestIosArm64 , and it actually compiles a test.kexe binary:

$ file build/bin/iosArm64/debugTest/test.kexe
build/bin/iosArm64/debugTest/test.kexe: Mach-O 64-bit executable arm64

[Marc Reichelt]

Now I just need to find out how to run that using xcrun or xcodebuild

[Darron Schall]

I think your best bet is going directly through Xcode via the iosApp. Write a test in the iOS application that exercises the shared library code, and launch via Xcode targeting a connected device.

The shared library only supports running iOS tests via simctl - https://github.com/JetBrains/kotlin/blob/8c2b2eb27816dcae23f284c02bd446a139f06a2c/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/native/tasks/KotlinNativeTest.kt#L256 - which is not capable of launching on a connected device.

Conceptually, the shared tests are unit tests in a KMM project. Neither the Android nor iOS targets are configured to run on real devices. The Android tests run on the JVM, and the iOS tests run on the simulator. To run Android tests on a device, there is androidAndroidTest, but AFAIK there is no ready iOS equivalent. See https://touchlab.co/understanding-and-configuring-your-kmm-test-suite/ for further details.

If you do manage to figure out how to run the shared test binary on a non-jailbroken device, I'd be curious what the command was. I've been toying locally, but can't get xcodebuild to create an archive of the test binary that I can sign/install on my device:

xcodebuild -exportArchive -archivePath ./shared/build/bin/iosArm64/debugTest -exportOptionsPlist ./shared/build/bin/iosArm64/debugTest/test.kexe.dSYM/Contents/Info.plist
error: archive at path '/Users/darron/Development/example-kmm/shared/build/bin/iosArm64/debugTest' is malformed