expect:
        notStopped

        when: "stopped first time"
        coordinator.stop()

        then: "stops"
        stopped

        when: "requested again"
        coordinator.stop()

        then:
        stopped
        0 * _._
    }

    def "await idle timeout does nothing when already stopped"() {
        given:
        coordinator.stop()

        when:

        when:
        createRunner().build()

        then:
        def t = thrown(InvalidRunnerConfigurationException)
        t.message == 'Please specify a project directory before executing the build'
    }

    def "throws exception if working directory is not provided when run is requested"() {
        when:
        createRunner().run()

	// InvalidPkgUse occurs when a package identifier is used outside of a
	// selector expression.
	//
	// Example:
	//  import "fmt"
	//
	//  var _ = fmt
	InvalidPkgUse

	// BadImportPath occurs when an import path is not valid.
	BadImportPath

	// BrokenImport occurs when importing a package fails.
	//
	// Example:
	//  import "amissingpackage"
	BrokenImport

        property.set(someValue())

        when:
        property.finalizeValueOnRead()

        then:
        0 * _

        when:
        def value = property.orNull

        then:
        value == someValue()

        and:
        1 * host.beforeRead(null) >> null
    }

    def "can disallow changes when host is not ready when unsafe read disallowed"() {
        given:

        when:
        def mapped = provider.map(transform)

        then:
        0 * transform._

        when:
        def present = mapped.present

        then:
        present

        and:
        1 * transform.transform(someValue()) >> someOtherValue()
        0 * transform._

        when:
        def result = mapped.get()

        then:

    def "prevents time from going backwards"() {
        when:
        setNanos 0

        then:
        clock.currentTime == START_MILLIS + 0

        when:
        setNanos 10

        then:
        clock.currentTime == START_MILLIS + 10

        when:
        setNanos 8

        then:
        clock.currentTime == START_MILLIS + 10

        when:
        setNanos 10

        then:

    def "cannot get artifacts when no result specified"() {
        when:
        result.result

        then:
        IllegalStateException e = thrown()
        e.message == 'No result has been specified.'
    }

    def "cannot get failure when no result specified"() {
        when:
        result.failure

        then:
        IllegalStateException e = thrown()

    }

    def "runs action for transition when in from state"() {
        def action = Mock(Runnable)
        def controller = controller(TestState.A)

        when:
        asWorker {
            controller.transition(TestState.A, TestState.B, action)
        }

        then:
        1 * action.run()
        0 * _
    }

    def "runs action and returns result for transition when in from state"() {

        when:
        generator.started(operation, startEvent)

        then:
        0 * _

        when:
        generator.progress(operationId, progressEvent)

        then:
        0 * _

        when:
        generator.finished(operation, finishEvent)

        then:
        0 * _
    }

    def "invalidates cache when set of Gradle property defining system properties changes"() {
        given:
        def configurationCache = newConfigurationCacheFixture()
        settingsFile << """
            println(gradleProp + '!')
        """

        when:
        configurationCacheRun "help", "-D${SYSTEM_PROJECT_PROPERTIES_PREFIX}gradleProp=1"