Running multi platform Kotlin test in IntelliJ produces No JDK specified error

Question

I have several tests in common module for multi platform Kotlin project. When I execute those tests using gradle, e.g. ./gradlew :android:test, they all go through and the tests run.

I have now encountered a more complicated problem where I would like to debug an actual test in IntelliJ. Unfortunately, upon selecting the debug option in IntelliJ, I get an No JDK specified error.

I am using the following dependencies for testing:

testImplementation "org.jetbrains.kotlin:kotlin-test-annotations-common:$kotlin_version"
testImplementation "org.jetbrains.kotlin:kotlin-test-common:$kotlin_version"

with $kotlin_version being 1.2.41.

The common module settings looks like this:

SDKs section also correctly recognises JDKs:

I have tried changing the Module SDK from Kotlin SDK to java, however IntelliJ then wants me to require jUnit for test execution, which I would prefer not to, if possible.

Is there a way how to make the debugger run in IntelliJ for the Kotlin code?

Answer 1

Found the solution.

Just like it does not make sense to execute tests using Gradle in the common module alone, e.g. ./gradlew :common:test and the tests need to be executed for a specific platform ./gradlew :android:test, because the common module might contain expected declarations which are supposed to be implemented per platform using the actual keyword, it also does not make sense to debug in the common module directly.

Instead, for such purposes, the test to be debugged must be placed in a specific platform module, for my purpose I have chosen the Android module, and then it can be executed and debugged.

As I have mentioned, this approach is necessary because in the Android module the expected structures are actually replaced by the actual implementations.