Android (JVM) targets

Requirements

A few things are required to test Android targets:

1. The Android SDK Command Line tools should be installed or, if they are not, you should provide a valid sdkHome directory in which they will be downloaded (macOS / Linux only).

   kotlin
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   multiplatformTesting {
       androidTools {
           // path to installed SDK, or path where SDK will be installed
           // defaults to $ANDROID_HOME environment variable.
           sdkHome.set("path/to/sdk")
       }
   }
   

2. Hardware acceleration. While Android documentation states that it is "recommended", hosts without acceleration are typically unable to run the emulator at all.

Note that if you connect a real device, the plugin will detect it and it will not try to launch an emulator. In this case, host hardware acceleration is not needed of course.

Tasks

Use ./gradlew tasks --group='Multiplatform Testing' to list all testing tasks.

The plugin provides two relevant tasks:

• run<TargetName>Tests tasks: runs tests for the specified target, typically this will be runAndroidTests unless you used a custom name for the android target.
• killAndroidEmulators task: kills all currently running emulators. Can be used to cleanup.

This means that the typical command will be:

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./gradlew app:runAndroidTests app:killAndroidEmulators

Configuration

kotlin
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multiplatformTesting {
    android {
        // Enforce testing on a specific API level. If not set, we'll choose the API level in
        // a way that minimizes the number of emulators and the download of new system images.
        // Defaults to the MPT_ANDROID_API environment variable.
        apiLevel.set(21)

        // Enforce testing on a specific image tag. If not set, we'll choose the image tag in
        // a way that minimizes the number of emulators and the download of new system images.
        // Defaults to the MPT_ANDROID_TAG environment variable.
        tag.set("google_apis")

        // Choose the default variant that will be tested when running 'runAndroidTests'.
        // Defaults to the MPT_ANDROID_VARIANT environment variable, falls back to "debug".
        defaultVariant.set("debug")

        // By default, run* tasks execute both instrumented tests and unit tests.
        // Set this flag to false to avoid running unit tests.
        includeUnitTests.set(false)
    }
}