Android UnitTest中的Application.class模拟 [英] Application.class mock in Android UnitTest

问题描述

我有一个Application类.

I have an Application class.

open class AppController : MultiDexApplication() {

    companion object {

        @JvmStatic
        lateinit var instance: AppController
            private set

    }

    override fun onCreate() {
        super.onCreate()

        instance = this
    }

}

我使用我的代码进行扩展.Int.kt

I use my code for extension. Int.kt

fun Int.pxToDp(): Int {
    return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, this.toFloat(), AppControllerMaster.instance.applicationContext.resources.displayMetrics).toInt()
}

我需要在单元测试中使用它.使用时出现此错误

I need to use that in a unit test. when use that I get this error

kotlin.UninitializedPropertyAccessException: lateinit property instance has not been initialized

我需要在单元测试中创建一个模拟或替代AppController.class.

I need to create a mock or alternative AppController.class in my unit test.

我需要在UnitTest中使用它，而不是androidTest.

I need to use it in UnitTest, not androidTest.

如何在UNITTEST中应用Crete或模拟?

how can Application Crete or mock in UNITTEST?

推荐答案

我没有使用Robolectric就找到了答案.

I found an answer without using Robolectric.

我在类com.example包中的类ContextEX.kt中创建了一个功能扩展

I create a function extension in package com.example in class with the name ContextEX.kt

ContextEX.kt

fun Any.getContextEX(): Context {
    return AppController.instance
}

并更改pxToDp范围.

and change pxToDp extention.

将 AppControllerMaster.instance.applicationContext 更改为 getContextEX().

fun Int.pxToDp(): Int {
    return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, this.toFloat(), getContextEX().resources.displayMetrics).toInt()
}

在测试中，我使用Mockk库模拟了Application类和上下文扩展

and in the test, I mock Application class and context extension with Mockk library

val context: Context = spyk()

// Mock Context extension
mockkStatic("com.example.ContextEXKt") // notic: not ContextEX.kt

val metrics: DisplayMetrics = mockk()
val resources: Resources = mockk()

every {
   any<Any>().getContext()
}.answers {
   context
}

every {
   any<Any>().getContext().resources
}.answers {
   resources
}

every {
   any<Any>().getContext().resources.displayMetrics
}.answers {
   metrics
}

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