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[Android] オブジェクトをMockする

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単体Test時に、ObjectをMockしたい時があったのでメモ。

class MainViewModel : ViewModel() {

    private val _date = MutableLiveData<String>()
    val date: LiveData<String>
        get() = _date

    fun fetchDate() {
        val sdf = SimpleDateFormat("yyyy/MM/dd HH:mm", Locale.JAPAN)
        _date.value = sdf.format(DateObj.getCurrent())
    }

}

上記のViewModelをTestするときに、DataObjをMockしてみる。

@Before
fun beforeTests() {
    mockkObject(DateObj)
    every { DateObj.getCurrent() } returns Data()
}
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