java.lang.reflect.InvocationTargetException when using Kotlin-Mokito library - mockito

Question

any() from Kotlin Mockito library crash with the following code
The Test Class
import com.nhaarman.mockito_kotlin.any
import com.nhaarman.mockito_kotlin.verify
import org.junit.Before
import org.junit.Test
import org.mockito.Mock
import org.mockito.MockitoAnnotations
class SimpleClassTest {
lateinit var simpleObject: SimpleClass
#Mock lateinit var injectedObject: InjectedClass
#Before
fun setUp() {
MockitoAnnotations.initMocks(this)
}
#Test
fun testSimpleFunction() {
simpleObject = SimpleClass(injectedObject)
simpleObject.simpleFunction()
verify(injectedObject).settingDependentObject(any())
}
}
The Source Class
import com.squareup.okhttp.Protocol
import com.squareup.okhttp.Request
import com.squareup.okhttp.Response
class SimpleClass(val injectedClass: InjectedClass) {
fun simpleFunction() {
injectedClass.settingDependentObject(Response.Builder()
.request(Request.Builder().url("https://example.com").build())
.code(200)
.body(null)
.protocol(Protocol.HTTP_1_1)
.build())
}
}
open class DependentClass(response: Response) {
}
open class InjectedClass() {
lateinit var response: Response
open fun settingDependentObject(response: Response) {
this.response = response
}
}
The Crash Log
java.lang.reflect.InvocationTargetException
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 kotlin.reflect.jvm.internal.FunctionCaller$Constructor.call(FunctionCaller.kt:63)
at kotlin.reflect.jvm.internal.KCallableImpl$DefaultImpls.call(KCallableImpl.kt:67)
at kotlin.reflect.jvm.internal.KFunctionImpl.call(KFunctionImpl.kt:30)
at kotlin.reflect.jvm.internal.KCallableImpl$DefaultImpls.callBy(KCallableImpl.kt:103)
at kotlin.reflect.jvm.internal.KFunctionImpl.callBy(KFunctionImpl.kt:30)
at com.nhaarman.mockito_kotlin.CreateInstanceKt.newInstance(CreateInstance.kt:138)
at com.nhaarman.mockito_kotlin.CreateInstanceKt.createInstance(CreateInstance.kt:60)
at com.elyeproj.phoneinfo.SimpleClassTest.testSimpleFunction(SimpleClassTest.kt:36)
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:69)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
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.AppMain.main(AppMain.java:144)
Caused by: java.lang.NullPointerException
at com.squareup.okhttp.Response.<init>(Response.java:56)
... 39 more

Answer 1

The library relies on the reflection to instantiate an object of a given type to be used as mockito "Any" object.
It might not be possible for those classes which have non-trivial constructors. Response is one of them.
If you could get an instance of Response somehow, you can use it instead like:
verify(injectedObject).settingDependentObject(Mockito.any<Response>() ?: someResponse)