How to debug why a given exclude on a source set might not work? Currently because of it is failing on the compileTestJava step 🤔

testing {
  suites {
    getting(JvmTestSuite::class) {
      targets {
        all {
          testTask.configure {
            sources {
              groovy {
                // exclude the suite to not double run
                exclude(listOf("**/JenkinsSuite.groovy"))
                exclude {
                  logger.warn(it.name)
                  true
                }
              }
            }
            useJUnitPlatform()
            finalizedBy(tasks.jacocoTestReport)
          }
        }
      }
    }

is what I have but does not work because:

❯ ./gradlew test
Configuration on demand is an incubating feature.
Calculating task graph as configuration cache cannot be reused because file 'build.gradle.kts' has changed.

> Task :compileTestGroovy FAILED
startup failed:
/Users/bgabor8/git/demo/test/main/JenkinsSuite.groovy: 6: unable to resolve class org.junit.platform.suite.api.Suite
 @ line 6, column 1.
   import org.junit.platform.suite.api.Suite

Is that a literal copy?