This document provides guidance on using Mockito to test a login controller class. It recommends creating a mock login integration layer and injecting it into the login controller. It then demonstrates how to write tests using Mockito to verify the login controller's behavior in different scenarios such as successful and failed logins. It also discusses using PowerMock to mock additional elements like private fields, static methods, and constructors when needed.

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• SUPPORTED BY OBJENESIS
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7. MOCK
MOCK
YAGNI

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10. private static final String USER = ”user123";
private static final String PASSWORD = ”pass123
@Test
public void testLoginSucess(){
LoginController loginBean = new LoginController();
LoginResponse outcome = loginBean.login(USER,PASSWORD);
Assert.assertEquals("Test Sucess login",true,outcome.isLoged());
}
Write a test for your controller as clean and simple as possible it doesn't need
pass or even compile

11. • Problem:
• Client have their own login service witch integration layer is not ready yet.
• You need to invoke login integration layer to perform login.
• Solution:
• Create a login integration mock.
• Inject login integration mock into loginController
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>2.15.0</version>
<scope>test</scope>
</dependency>
authenticatorMock = mock(AuthenticatorInterface.class);
loginBean.setAutenticator(authenticatorMock);
when(authenticatorMock.login(USER,PASSWORD)).thenReturn(true);

12. Given user perform login then audit login attempt
verify(authenticatorMock,atLeastOnce()).audit(USER,"BEGIN");
Given user perform login when credentials are correct then audit login success
verify(authenticatorMock,atLeastOnce()).audit(USER,"SUCESS")

13. Check the execution order of your class, in real implementation even!
InOrder inOrder = inOrder(authenticatorMock);
inOrder.verify(authenticatorMock,atLeastOnce()).audit(USER,"BEGIN");
inOrder.verify(authenticatorMock,times(1)).login(USER,PASSWORD);
inOrder.verify(authenticatorMock, atLeast(1)).audit(USER,"SUCESS");

14. Given user perform login when credentials are correct then send mail notification
verify(loginBean,times(1)).notifyEvent(USER,"SUCESS");
loginBean = spy(new LoginController());

15. Given user perform login when credentials are not correct then return false
Given user perform login when password is not valid then return IllegalArgumentException
when(authenticatorMock.login(USER,null))
.thenThrow(new IllegalArgumentException());
Create an argument matcher and make more BDD like
given(authenticatorMock.login(eq(USER), argThat(invallidPassword )))
.willThrow(new IllegalArgumentException());
private static ArgumentMatcher<String> invallidPassword = new ArgumentMatcher<String>() {
public boolean matches(String s) {
return //implement your argument validator;
}
};

16. Given user perform login when credentials are correct
then return login menu and last login date.
Assert.assertEquals("verify user info size",2,outcome.getUserInfo().size());
private Answer sucessAnswer = new Answer<HashMap<String, Object>>() {
public HashMap<String, Object> answer(InvocationOnMock invocationOnMock) throws Throwable {
HashMap<String, Object> userInfo = new HashMap<String, Object>();
//create your custom answer
return userInfo;
}
};
when(dataProviderMock.getUserInfo(USER))
.thenAnswer(sucessAnswer);

17. Mockito PowerMock
2.8.0-2.8.9 1.7.x
2.7.5 1.7.0RC4
2.4.0 1.7.0RC2
1.10.8 - 1.10.x 1.6.2 - 2.0
1.9.5-rc1 - 1.9.5 1.5.0 - 1.5.6
1.8.5 1.3.9 - 1.4.9
1.8.4 1.3.7 & 1.3.8
1.8.3 1.3.6
1.8.1 & 1.8.2 1.3.5
1.8 1.3

18. Private field? -> Whitebox.setInternalState(loginBean, "dataProvider", dataProviderMock);
Static method? -> mockStatic(LoginController.class);
@RunWith(PowerMockRunner.class)
@PrepareForTest(LoginController.class)
public class LoginControllerTest {
}
Avoid constructor -> Whitebox.newInstance(LoginController.class)
Avois static inizializer -> @SuppressStaticInitializationFor("com.jug.mockito.LoginController")
Avoid method -> suppress(method(LoginController.class, "notifyAllNodes"))

19. https://github.com/powermock/powermock/wiki/Suppress-Unwanted-Behavior
https://github.com/powermock/powermock/wiki/Mockito
https://github.com/mockito/mockito/wiki