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 "exits when build fails with compile error"() {
        when:
        buildFile << """
            'script error
        """

        then:
        fails("a")
        exitContinuousBuildSinceNoDeclaredInputs()
    }

    def "exits when build fails with configuration error"() {
        when:
        buildFile << """
            throw new Exception("!")
        """

    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()

        when:
        generator.started(operation, startEvent)

        then:
        0 * _

        when:
        generator.progress(operationId, progressEvent)

        then:
        0 * _

        when:
        generator.finished(operation, finishEvent)

        then:
        0 * _
    }

            }
        """

        when:
        succeeds ":customTask", "-PoutputDir=build/output1"
        then:
        executedAndNotSkipped ":customTask"

        when:
        succeeds ":customTask", "-PoutputDir=build/output2"
        then:
        executedAndNotSkipped ":customTask"

        when:
        succeeds ":customTask", "-PoutputDir=build/output1"
        then:

        when:
        runWithInput("generate", prompt, "value")

        then:
        result.assertTaskNotSkipped(":generate")
        file("build/out.txt").text == "value"

        when:
        runWithInput("generate", prompt, "value")

        then:
        result.assertTaskSkipped(":generate")

        when:
        runWithInput("generate", prompt, "")

        given:
        list.add('b')

        when:
        list.add(0, 'a')
        list.add(2, 'c')

        then:
        list == ['a', 'b', 'c']
    }

    def "fires events when element is added at index"() {
        Action<String> action = Mock()

        given:
        list.all(action)

        when:
        list.add(0, 'a')
        list.add(0, 'b')

        then:

        def supplier = Mock(Supplier)

        when:
        def lazy = factory(supplier)

        then:
        0 * supplier._

        when:
        lazy.use {
            assert it == 123
        }

        then:
        1 * supplier.get() >> 123

        when:
        lazy.get()

        then:
        0 * supplier.get()

        when:
        lazy.use {

        instant.actionExecuted
    }

    def "fails when waiting for an instant that is not defined by any thread"() {
        instant.timeout = 100

        when:
        thread.blockUntil.unknown

        then:
        IllegalStateException e = thrown()
        e.message == "Timeout waiting for instant 'unknown' to be defined by another thread."

        when:
        async {
            thread.blockUntil.unknown

    def "downloads deleted files again when they are referenced"() {
        given:
        buildscriptWithDependency(snapshotModule)

        when:
        succeeds 'resolve'

        then:
        def jarFile = findFile(cacheDir, "files-*/**/*.jar")

        when:
        assert jarFile.delete()

        and:
        succeeds 'resolve'