/**
     * Asserts there is a task ready to run, and runs it.
     */
    void assertNextTaskReady(Task task) {
        def node = selectNextTaskNode()
        assert node.task == task
        assertWorkReadyToStart()
        finishedExecuting(node)
    }

    void assertTaskReady(Task task, boolean needToSelect = false) {
        def node = selectNextTaskNode()
        assert node.task == task