java.lang.NoClassDefFoundError: org/gradle/kotlin/dsl/PluginAwareExtensionsKt when applying plugin to a Project with a sub Project during tests about dependency-analysis-gradle-plugin HOT 1 OPEN

Thanks for the issue. Looks like some kind of classpath issue. It reminds me of a case in a real (non-test) project that uses Kotlin but wasn't applying any Kotlin plugin to the root project. I am not entirely sure how the classpath works in the context of a unit test like you have, but as I stare at the error and the build scan you shared, it occurs to me that my plugin uses Kotlin DSL, and that missing class is from the Kotlin DSL -- that is, the Gradle jar itself. Maybe try adding testRuntimeOnly(gradleApi()) to your build script. That may not work though because I'm not certain that dependencies also contains the Kotlin DSL classes. My IDE tells me that class comes from gradle-kotlin-dsl-8.5.jar.

More generally, I'm not sure it makes a lot of sense to try to unit test this. I recommend writing functional tests instead. I have a plugin and companion libraries for that here if you're interested.

from dependency-analysis-gradle-plugin.