Mockk: Bug: in Android Studio and Gradle 5+ "ByteBuddyAgent not found"

[oshamahue]

Prerequisites

Please answer the following questions for yourself before submitting an issue.

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

Expected Behavior

Tests to run

Current Behavior

An exception is thrown

Failure Information (for bugs)

I guess the dependency behaviour is changed with gradle 5 and it causes the ByteBuddyAgent is not included in the build.

Steps to Reproduce

Any test with mockito mocks with gradle 5+ version fails when MockKAnnotations.init(this, relaxUnitFun = true) is called

Context

• MockK version:1.8.13.kotlin13
• OS: MacOs 10.14.2
• Kotlin version:1.3.0
• JDK version:jdk1.8.0_91
• Kotlin test version: 1.3.0
• Type of test: unit test

Stack trace

// -----------------------[ YOUR STACK STARTS HERE ] -----------------------
java.lang.NoClassDefFoundError: net/bytebuddy/agent/ByteBuddyAgent

    at io.mockk.proxy.jvm.JvmMockKAgentFactory.initInstrumentation(JvmMockKAgentFactory.kt:122)
    at io.mockk.proxy.jvm.JvmMockKAgentFactory.init(JvmMockKAgentFactory.kt:31)
    at io.mockk.impl.JvmMockKGateway.<init>(JvmMockKGateway.kt:45)
    at io.mockk.impl.JvmMockKGateway.<clinit>(JvmMockKGateway.kt:163)
    at com.mine.initTests(My.kt:431)
    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.RunBefores.evaluate(RunBefores.java:24)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.robolectric.internal.SandboxTestRunner$2.evaluate(SandboxTestRunner.java:260)
    at org.robolectric.internal.SandboxTestRunner.runChild(SandboxTestRunner.java:130)
    at org.robolectric.internal.SandboxTestRunner.runChild(SandboxTestRunner.java:42)
    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.robolectric.internal.SandboxTestRunner$1.evaluate(SandboxTestRunner.java:84)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$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)
Caused by: java.lang.ClassNotFoundException: net.bytebuddy.agent.ByteBuddyAgent
    at org.robolectric.internal.bytecode.SandboxClassLoader.getByteCode(SandboxClassLoader.java:163)
    at org.robolectric.internal.bytecode.SandboxClassLoader.maybeInstrumentClass(SandboxClassLoader.java:118)
    at org.robolectric.internal.bytecode.SandboxClassLoader.lambda$findClass$0(SandboxClassLoader.java:111)
    at org.robolectric.util.PerfStatsCollector.measure(PerfStatsCollector.java:50)
    at org.robolectric.internal.bytecode.SandboxClassLoader.findClass(SandboxClassLoader.java:110)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 29 more

[oleksiyp]

Oops. Thanks for the report

[oleksiyp]

Fast workaround:

testImplementation 'net.bytebuddy:byte-buddy-agent:1.8.22'

[oleksiyp]

Seems Android Studio skipping runtime classpath when running tests. Reported here: https://issuetracker.google.com/issues/122163320

[oshamahue]

Thank you for looking into it.

[oleksiyp]

Please check version 1.9 or 1.9.kotlin12 if the issue still present

[oshamahue]

Looks good. Thanks a lot.