6.times {
                start {
                    thread.blockUntil.allStarted
                    WorkQueue queue = workerExecutor."${isolationMode}" Actions.doNothing()
                    queue.submit(TestExecution.class, Actions.doNothing())
                }
            }
            instant.allStarted
        }

        then:
        6 * workerThreadRegistry.workerThread >> true
        6 * executionQueue.submit(_)

            def action = connection.action(new NullAction())
            action.standardOutput = outputStream
            action.run()
        }
    }

    // since 2.6
    def testExecution() {
        buildFile << """
apply plugin: 'java'
repositories {
    maven {
        url '${buildContext.localRepository.toURI()}'
    }
}
${mavenCentralRepository()}
dependencies {