finishedExecuting(firstTaskNode)
        def secondTask = selectNextTask()

        assert [firstTaskNode.task, secondTask] as Set == [first, second] as Set
    }

    private void tasksAreExecutedInParallel(Task first, Task second) {
        addToGraphAndPopulate(first, second)

        def tasks = [selectNextTask(), selectNextTask()]

        assert tasks as Set == [first, second] as Set
    }