mockk: Bug: MockK is not runnable together with PowerMockito

Prerequisites

I am running the latest version
I checked the documentation and found no answer
I checked to make sure that this issue has not already been filed

Expected Behavior

Mocking a static method

Failure Information (for bugs)

java.lang.ExceptionInInitializerError at my.package.ConfigUseCaseTests.getConfigs_fromJson(ConfigUseCaseTests.kt:33) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131) Caused by: io.mockk.MockKException: Failed to load plugin io.mockk.proxy.jvm.JvmMockKAgentFactory at io.mockk.impl.JvmMockKGateway.<init>(JvmMockKGateway.kt:152) at io.mockk.impl.JvmMockKGateway.<clinit>(JvmMockKGateway.kt:138) … 29 more Caused by: java.lang.IllegalStateException: Error during attachment using: net.bytebuddy.agent.ByteBuddyAgent$AttachmentProvider$Compound@1c72da34 at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:377) at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:351) at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:319) at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:305) at io.mockk.proxy.jvm.MockKInstrumentation.<init>(MockKInstrumentation.java:57) at io.mockk.proxy.jvm.JvmMockKAgentFactory.<init>(JvmMockKAgentFactory.java:11) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.lang.Class.newInstance(Class.java:442) at io.mockk.impl.JvmMockKGateway.<init>(JvmMockKGateway.kt:150) … 30 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at net.bytebuddy.agent.Attacher.install(Attacher.java:77) at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:372) … 41 more Caused by: java.lang.NullPointerException at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:187) … 47 more

Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

MockK version: 1.8.0
OS: Mac OS High Sierra
Kotlin version: 1.2.30
JDK version: 1.8.0_161
Type of test: unit test

Minimal reproducible code (the gist of this issue)

// These are some of the Gradle implementations.
    // Power Mockito
    testImplementation 'org.powermock:powermock-api-mockito:1.6.1'
    testImplementation 'org.powermock:powermock-module-junit4-rule-agent:1.6.1'
    testImplementation 'org.powermock:powermock-module-junit4-rule:1.6.1'
    testImplementation 'org.powermock:powermock-module-junit4:1.6.1'

    // Mockk
    testImplementation "io.mockk:mockk:1.8"

    // Mockito
    def mockitoVersion = "1.5.0"
    testImplementation "org.mockito:mockito-core:$mockitoVersion"
    testImplementation "com.nhaarman:mockito-kotlin-kt1.1:$mockitoVersion"
    androidTestImplementation("com.nhaarman:mockito-kotlin-kt1.1:$mockitoVersion", {
        exclude group: 'org.mockito', module: 'mockito-core'
    })
    androidTestImplementation 'org.mockito:mockito-android:2.11.0'

    class ConfigUseCaseTests : UnitTestsResource() {
    
        private lateinit var configUseCase: ConfigUseCase
    
        @Before
        override fun setUp() {
            super.setUp()
            configUseCase = ConfigUseCase()
        }
    
        @Test
        fun getConfigs_fromJson() {
            objectMockk(SharedPreferencesHelper).mock()
            every { SharedPreferencesHelper.loadString(isA(), isA(), isA(), isA()) } returns "wooo"
            System.out.println("String:${SharedPreferencesHelper.loadString(context, "", "", null)}")
        }
    }

I’ve also tested it with staticMockk or any other examples provided but I’m getting the same error.

About this issue

Original URL
State: closed
Created 6 years ago
Comments: 21

Most upvoted comments

I played a bit more. Following code is printing for me null for some reason.
@RunWith(PowerMockRunner::class)
@PowerMockIgnore(
    "io.mockk.proxy.jvm.dispatcher.JvmMockKWeakMap",
    "io.mockk.proxy.jvm.dispatcher.JvmMockKDispatcher"
)
class SomeJavaClassTest {
    open class Tst(val x: Int = 5) {
        open fun tst() = "abc$x"
    }

    @Test
    fun testPowerMock(){
        val tst = Tst(6)
        PowerMockito.whenNew(Tst::class.java)
            .withAnyArguments()
            .thenReturn(tst)
        println(Tst())
    }
}
There is no MockK involved here at all and thus it should not load. Somebody should check if these workarounds are really working. If yes I can submit PR to PowerMock to include this as a permanent solution.

The general conclusion is that MockK lacks integration tests with other frameworks.

@oleksiyp Not worked for my project until I changed the code as below :

@PowerMockIgnore(
    "io.mockk.proxy.*"
)

This is like the case that Robolectric will encounter also. Robolectric : Using-PowerMock

pentiumao on Nov 15, 2018

At least I found some workaround. Provided example do not throw any exception. Do not know if it will work in general.

@RunWith(PowerMockRunner::class)
@PowerMockIgnore(
    "io.mockk.proxy.jvm.dispatcher.JvmMockKWeakMap",
    "io.mockk.proxy.jvm.dispatcher.JvmMockKDispatcher"
)
class SomeJavaClassTest {

    @Before
    fun setup(){
        MockKAnnotations.init(this)

    }

    @Test
    fun someTest(){

    }
}

oleksiyp on Nov 11, 2018