I have the following module structure:

lib-tests/src/main/kotlin/org/example/ReusableTest.kt
app-impl1/
app-impl2/

In the

dependencies {}

in

build.gradle.kts

of

app-impl1/

and

app-impl2/

I have

testImplementation(project(":lib-tests"))

. The purpose is, as I hope is obvious from the structure, to have the tests from

lib-tests/

run for both apps. However, the tests are not run. I'm using Gradle 8.7, Java 21, Kotlin 1.9.23, JUnit Platform 5.10.2. Where can I find more documentation on how Gradle discovers tests so that I can get this running? (Note that for feature files in Cucumber running as JUnit extension, this setup works just fine, pulling them in from

lib-tests/src/main/resources/features

.)

The

Test

task only looks at its

testClassesDirs

property for where to find test classes (https://docs.gradle.org/current/userguide/java_testing.html#sec:java_testing_basics), so if the test classes come from another project I suppose you'd have to first copy/extract them into a directory you can configure as

testClassesDirs

.

So effectively adding

../lib-tests/build/classes/kotlin/main

to

testClassesDirs

should do the trick?

Off the top of my head: create a configuration, configure it to resolve the

classes

variant (ask for the libraryelements=classes attribute, maybe also add artifact-type=directory) and non-transitive, add

project(":lib-tests")

as a dependency to that configuration, then add the configuration to the

testClassesDirs

.