저는 Presenter를 테스트하고 있습니다. 그런데 RxJava와 관련된 테스팅 도중 해결할 수 없는 NullPointer문제에 빠졌습니다.

아래는 제 Presenter 코드입니다

class SplashPresenter(
    private val loginUseCase: LoginUseCase,
    composite: CompositeDisposable
) : BasePresenter<SplashContract.View>(composite), SplashContract.Presenter {

    override fun onAutoLogin() {
        add(
            loginUseCase.login(Any()).subscribe({
                when (it.code()) {
                    200 -> {
                        view.startMain()
                        view.finishActivity()
                    }
                    404, 500 -> {
                        view.startLogin()
                        view.finishActivity()
                    }
                }
            }, {
                view.startLogin()
                view.finishActivity()
            })
        )
    }
}

아래는 제가 작성해본 테스트 코드입니다

@RunWith(MockitoJUnitRunner::class)
class SplashPresenterTests {

    @Mock private lateinit var loginUseCase: LoginUseCase

    @Mock private lateinit var composite: CompositeDisposable

    @Mock private lateinit var view: SplashContract.View

    private lateinit var presenter: SplashContract.Presenter

    @Before
    fun init() {
        MockitoAnnotations.initMocks(this)
        presenter = SplashPresenter(loginUseCase, composite)
        presenter.createView(view)
    }

    @Test
    fun `start auto login success test`() {
        val request = Any()
        val response = hashMapOf("user_token" to "USER_TOKEN")

        `when`(loginUseCase.login(request))
            .thenReturn(Flowable.just(Response.success(200, response)))

        presenter.onAutoLogin()
    }
}

마지막으로 위 테스트를 실행하면 나오는 에러 로그입니다

java.lang.NullPointerException
    at com.dsm.isitlegal.presentation.ui.splash.SplashPresenter.onAutoLogin(SplashPresenter.kt:14)
    at com.dsm.isitlegal.presenter.SplashPresenterTests.start auto login success test(SplashPresenterTests.kt:43)
    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.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:78)
    at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:84)
    at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
    at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:161)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$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)