refrectionを使った箇所でjava.lang.VerifyError: Bad type on operand stackでハマった話

## kotlinでテストがしたい！！

[nhaarman/mockito-kotlin](https://github.com/nhaarman/mockito-kotlin)でテストをしようとしていたら、以下のようなエラーでひっかかりにひっかかった。

> java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:    kotlin/reflect/jvm/internal/ReflectionFactoryImpl.function(Lkotlin/jvm/internal/FunctionReference;)Lkotlin/reflect/KFunction; @5: invokestatic
  Reason:
    Type 'kotlin/jvm/internal/FunctionReference' (current frame, stack[2]) is not assignable to 'kotlin/jvm/internal/CallableReference'
  Current Frame:
    bci: @5
    flags: { }
    locals: { 'kotlin/reflect/jvm/internal/ReflectionFactoryImpl', 'kotlin/jvm/internal/FunctionReference' }
    stack: { uninitialized 0, uninitialized 0, 'kotlin/jvm/internal/FunctionReference' }
  Bytecode:
    0x0000000: bb00 1059 2bb8 0042 2bb6 0020 2bb6 0021
    0x0000010: 2bb6 001f b700 38b0                    
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at kotlin.jvm.internal.Reflection.<clinit>(Reflection.java:32)
	at 自分のテストでany()入れた場所
	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.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)
Process finished with exit code 255

箇所的にはmockito-kotlinのany()呼び出し場所。そんな変なことはしていないはず。

結論としては、kotlin-stdlibやkotlin-reflectと比べ、kotlin-runtimeのversionが低かった！！
ExternalLibrariesでkotlinで検索したところ、一つだけversionが違う。
stdlibやreflectはtestCompileで設定していたのに、runtimeだけはあるライブラリで依存していたものがそのまま使われていたため。
追加でtestCompileに追加したところ、このエラーは消えました。

gradleのdependenciesをちゃんと調べるのは大事ですね……