安卓Kotlin单元测试/ Collection, ArrayList依赖的解耦/ MockK

本来这种依赖的解耦很复杂，以为不能实现。

原来，要了解for的运行机制，然后进行mock，就可以实现单元测试。

1. 这里是通过迭代遍历Collection。

需要的是.size和.iterator.hasNext()。

    fun getBeaconsInfo(beacons:Collection<Beacon>):HashMap<Int,Double>{
        var infos = HashMap<Int,Double>()

        if (beacons.size > 0) {
            for(beacon in beacons){
                infos.put(beacon.id3.toInt(),beacon.distance)
            }
        }

        return infos
    }

使用了Kotlin测试工具Mockk

    @Test
    fun getBeaconsInfo1(){
        val beacons = mockk<Collection<Beacon>>()

        every { beacons.size } returns 3
        every { beacons.iterator().hasNext() } returns true andThen true andThen  true andThen false
        every { beacons.iterator().next().id3.toInt() } returns 8 andThen 5 andThen 1
        every { beacons.iterator().next().distance } returns 5.0 andThen 10.0 andThen 1.0

        val infos = HashMap<Int, Double>()
        infos[8] = 5.0
        infos[5] = 10.0
        infos[1] = 1.0

        assertEquals(infos,SISSIController.instance.getBeaconsInfo(beacons))
    }

2. 这里是单纯for循环。

此外，我这里用到了.last()

需要的是.size和isEmpty()。

    fun normalize(path: ArrayList<Arrival>): HashMap<Int, Double> {
        var rating:HashMap<Int,Double> = HashMap()
        var sum = path.last().time - path[0].time

        for (i in 1 until path.size) {
            rating.put(path[i - 1].beacon, (path[i].time - path[i - 1].time).toInt() * 1.0 / sum)
        }

        return rating
    }

    @Test
    fun normalize() {
        val path = mockk<ArrayList<Arrival>>()

        every { path.isEmpty() } returns false
        every { path.size } returns 5

        every { path.last().time } returns 90000
        every { path[0].beacon } returns 1
        every { path[0].time } returns 50000

        every { path[1].beacon } returns 2
        every { path[1].time } returns 60000

        every { path[2].beacon } returns 3
        every { path[2].time } returns 70000

        every { path[3].beacon } returns 4
        every { path[3].time } returns 80000

        every { path[4].beacon } returns 5
        every { path[4].time } returns 90000

        val rating: HashMap<Int, Double> = HashMap()
        rating[1] = 0.25
        rating[2] = 0.25
        rating[3] = 0.25
        rating[4] = 0.25

        assertEquals(rating, SISSIController.instance.normalize(path))
    }

原文地址：https://www.cnblogs.com/ppCola/p/11902308.html