Parallel sourceset for Gradle Groovy build avoidance

build.gradle

  sourceSets {
    testWip {
      groovy {
        srcDirs = ['src/test/groovyWip']
        compileClasspath = sourceSets.test.compileClasspath + sourceSets.main.compileClasspath
        runtimeClasspath = sourceSets.test.runtimeClasspath + sourceSets.main.runtimeClasspath
      }
    }
  }

  test {
    useJUnitPlatform()
    finalizedBy jacocoTestReport
    systemProperty 'user.timezone', 'UTC'
    // add separate sourceset to existing test task so that we can move WIP tests here
    // to avoid recompile of all groovy tests
    sourceSets.add(sourceSets.testWip)
    testClassesDirs += sourceSets.testWip.output.classesDirs
    classpath += sourceSets.testWip.output
  }