如何在Kotlin中进行单元测试（单例）对象类

Question

我有一个Kotlin Singleton类，该类保持我要在给定Test方法中测试具有不同状态的此类的状态。

object CreateChallengeState {

/*
* Started Challenge
*
* */
var startedChallengeLiveData = MutableLiveData<String?>()



/*
*
* Challenge Duration Data
*
* */
data class ChallengeDate(val start: Date? = null, val end: Date? = null)

@JvmField
var challengeDateLiveData = MutableLiveData<ChallengeDate>()

var startDateShortLiveData: LiveData<String?> = Transformations.map(challengeDateLiveData) {
    it?.start?.let { date -> getShortDateTime(date) }
}
var startDateLiveData: LiveData<String?> = Transformations.map(challengeDateLiveData) {
    it?.start?.let { date -> getDateTime(date) }
}
var endDateShortLiveData: LiveData<String?> = Transformations.map(challengeDateLiveData) {
    it?.end?.let { date -> getShortDateTime(date) }
}
var endDateLiveData: LiveData<String?> = Transformations.map(challengeDateLiveData) {
    it?.end?.let { date -> getDateTime(date) }
}
var endTimeStampData: LiveData<Long?> = Transformations.map(challengeDateLiveData) {
    it?.end?.let { date -> date.time }
}



/*
*
*   Customize Challenge
*
* */
val title = MutableLiveData<String?>().also { it.value = "" }
val color = MutableLiveData<String?>().also { it.value = "" }
val userUrl = MutableLiveData<String?>().also { it.value = "" }
val userName = MutableLiveData<String?>().also { it.value = "" }
val globalHeaderUrl = MutableLiveData<String?>().also { it.value = "" }
val challengeMission = MutableLiveData<String?>().also { it.value = "" }
val challengeTarget = MutableLiveData<String?>().also { it.value = "" }



/*
*
* Challenges States
*
* */


var isDateEnable: LiveData<Boolean> = startDateLiveData.combine(endDateLiveData) { a, b ->
    a != null && a.isNotBlank() && b != null && b.isNotBlank()
}

var isCustomizationLocalButtonEnable: LiveData<Boolean> =
    combine(title, color, userUrl, userName) { title,
                                               color,
                                               userUrl,
                                               userName ->
        title != null && title.isNotBlank() &&
                color != null && color.isNotBlank() &&
                userUrl != null && userUrl.isNotBlank() &&
                userName != null && userName.isNotBlank()
    }





 }




`@Test
fun isDurationButtonEnable() {
    val challengeState = spyk<CreateChallengeState>()
    challengeState.challengeDateLiveData.value = currentDate
    assertEquals(challengeState.isDateEnable.getOrAwaitValue(), true)
}

@Test
fun isDurationButtonShouldNotEnable_1() {
    val challengeState = spyk<CreateChallengeState>()
    challengeState.challengeDateLiveData.value = endDateNull
    assertEquals(challengeState.isDateEnable.getOrAwaitValue(), false)
}`

我该如何测试该类，我想为每个测试方法创建不同的CreateChallengeState对象，但由于类是单例，它也在其他方法中更改了我不想要的CreateChallengeState的状态。