when:
        // Block until first build has produced red things
        def build1 = executer.withTasks("redThings", "block1", "blueThings").start()
        block1.waitForAllPendingCalls()

        // Block until second build has produced blue things
        def build2 = executer.withTasks("redThings", "blueThings", "block2").start()
        block2.waitForAllPendingCalls()

    compile files(f)
}

task redThings {
    def fileCollection = configurations.compile.incoming.artifactView { attributes { it.attribute(type, "red") } }.files
    doLast {
        fileCollection.files
    }
}
"""
        // Ensure build scripts compiled
        run("help")

        when:
        def build1 = executer.withTasks("redThings").withArgument("-Dcrash=true").start()