I'm trying to test this class:
class LoginPresenter(val mPostman: Postman) : ContractLoginPresenter, Validator.ValidationListener {
private var view: ContractLoginView? = null
override fun setView(_view: BaseView) {
view = _view as ContractLoginView
}
override fun getValidationListener(): Validator.ValidationListener {
return this
}
override fun onValidationSucceeded() {
view!!.getContext().showCircularProgressBar()
mPostman.login(view!!.getUsername(), view!!.getPassword())
}
For this purpose, I've created this test class:
@RunWith(PowerMockRunner::class)
@PrepareForTest(App::class)
class TestLoginPresenter {
var mockedPostman = mock(Postman::class.java)
var mockedComponent = mock(MainComponent::class.java)
var mockedView = mock(ContractLoginView::class.java)
var mockedContext = mock(AppCompatActivity::class.java)
var loginPresenter: LoginPresenter? = null
@Before
fun setUp() {
PowerMockito.mockStatic(App::class.java)
`when`(App.component).thenReturn(mockedComponent)
loginPresenter = LoginPresenter(mockedPostman)
loginPresenter!!.setView(mockedView)
`when`(mockedView.getContext()).thenReturn(mockedContext)
}
@Test
fun testGetValidationListener() {
assertEquals(loginPresenter!!.getValidationListener(), loginPresenter)
}
@Test
fun testOnValidationSucceeded() {
val password = "password"
val username = "username"
`when`(mockedView.getPassword()).thenReturn(password)
`when`(mockedView.getUsername()).thenReturn(username)
//Mockito.doNothing().`when`(mockedPostman).login(anyString(), anyString())
loginPresenter!!.onValidationSucceeded()
verify(mockedPostman.login(username, password))
}
Which is failing with the following stacktrace:
java.lang.NullPointerException
at br.com.tyllt.controller.Postman.login(Postman.kt:26)
at br.com.tyllt.presenter.LoginPresenter.onValidationSucceeded(LoginPresenter.kt:43)
at br.com.tyllt.presenter.TestLoginPresenter.testOnValidationSucceeded(TestLoginPresenter.kt:63)
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.internal.runners.TestMethod.invoke(TestMethod.java:68)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:310)
at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:89)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:97)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:294)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:127)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:87)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:50)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:122)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:106)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
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)
Process finished with exit code -1
The place that the stacktrace point is the last line of postman's login fun:
open class Postman(val mMessenger: TylltEndPoint) {
fun login(email: String, password: String) {
val user = User()
user.email = email
user.password = password
mMessenger.login(user).enqueue(ResponseWrapperCallback(EventCatalog.e0014))
}
Once postman is being mocked, why in the world is it calling the actual implementation of login()
fun?
Apart from having the Postman class as open, you also need to have the login method as open in order to be able to mock it.
So the Postman class needs to be:
This is such a common issue/complaint amongst users, that there is also an official all-open plugin that does this everywhere for you (if you don't care to strictly adhere to the principle of prohibiting inheritance unless you design for it).