Classes not mocked with Kotlin

[SpaceBison]

This might be related to #56. Using Unmock with Kotlin does not seem to work.

Example to reproduce:

• UnMock 7.3
• Kotlin 1.3.31
• Gradle 5.1.1
• Android Gradle plugin 3.4.0

Project level build.gradle buildscript block:

buildscript {
    ext.kotlin_version = '1.3.31'
    repositories {
        google()
        jcenter()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'de.mobilej.unmock:UnMockPlugin:0.7.3'
    }
}

Example test to reproduce:

class ExampleTest {

    @Test
    fun test() {
        assertTrue(Looper.getMainLooper().isCurrentThread)
    }
}

Result:

java.lang.RuntimeException: Method getMainLooper in android.os.Looper not mocked. See http://g.co/androidstudio/not-mocked for details.

at android.os.Looper.getMainLooper(Looper.java)
at com.example.unmockkotlin.RegularTest.addition_isCorrect(RegularTest.kt:11)

[bjoernQ]

Hi,

by default only a small portion of the SDK is "unmocked". You could configure which classes you want but in this case Looper uses other classes e.g. MessageQueue which call into native code. This won't work.

You could:

• mock these classes yourself with a strong mocking framework e.g. MockK
• try using Robolectric: Robolectric tries to emulate most of the SDK (in opposite to this project)

Hope this helps.

Closing this because it works as designed

[calvarez-ov]

I came here looking for any info about mockk being used in conjuction with UnmockPlugin.

I only use mockk and was hoping to remove some of my mockk code by using UnmockPlugin instead, but I'm running into issues where mockk, which previously worked, is now broken. I don't have a sample project to share. I can provide more info if needed. But before getting too deep into this, I was wondering if there is already some known limitations making these two tools not work with each other.

For info, here's a small snippet:

val app = spyk(Application())
every { app.packageName } returns "some package"
every { app.applicationContext } returns app
assertEquals("some package", app.packageName)
// Pass this `app` instance to objects which will access `app.packageName` or `app.applicationContext`

When unmock is used, the every line fails with

io.mockk.MockKException: Missing calls inside every { ... } block.
    at io.mockk.impl.recording.states.StubbingState.checkMissingCalls(StubbingState.kt:14)
    at io.mockk.impl.recording.states.StubbingState.recordingDone(StubbingState.kt:8)
    at io.mockk.impl.recording.CommonCallRecorder.done(CommonCallRecorder.kt:47)
    at io.mockk.impl.eval.RecordedBlockEvaluator.record(RecordedBlockEvaluator.kt:60)
    at io.mockk.impl.eval.EveryBlockEvaluator.every(EveryBlockEvaluator.kt:30)
    at io.mockk.MockKDsl.internalEvery(API.kt:92)
    at io.mockk.MockKKt.every(MockK.kt:104)
    at com.example.MyTest.setUp(MyTest.kt:66)

The error I get varies depending on:

• if I use keep, keepStartingWith, delegateClass or no rule at all for various classes (android.app.Application, android.content.Context, android.content.ContextWrapper...)
• if I use spyk(Application()) or mockkClass(Application::class, relaxed=true)

I haven't found any combination which works

UPDATE: I migrated my module to use mockito instead of mockk, and it works.

[bjoernQ]

Thanks for the update! Good to hear Mockito solves the problem

I think I used the plug-in with mockk before but I should try it again to see if I can improve anything