How to mock exceptions using Mockito?

In the previous post I shared a sample program to mock exception conditions using JMockit. Today we will look into exception mocking with Mockito. As I mentioned in the earlier post, during the development time, testing an exception scenario without the help of the second party/third party service developer is not an easy task. However a mocking framework like Mockito will make things very simple for developers.

Complete source code used in this article can be cloned from github

package com.ourownjava.tdd.mockito.exception;
/**
*
* @author Sanju Thomas
*
*/
public interface DirtyWordService {
public String getADirtyWord() throws DirtyWordsExhaustedException;
}

package com.ourownjava.tdd.mockito.exception;
/**
*
* @author Sanju Thomas
*
*/
public class DirtyWordsExhaustedException extends Exception {
private static final long serialVersionUID = 1L;
public DirtyWordsExhaustedException(final String message){
super(message);
}
}

package com.ourownjava.tdd.mockito.exception;
public class ShoutingManager {
private DirtyWordService dirtyWordService;
public String getADirtyWord() throws DirtyWordsExhaustedException{
return dirtyWordService.getADirtyWord();
}
}

package com.ourownjava.tdd.mockito.exception;
import static org.mockito.Mockito.when;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;
/**
*
* @author Sanju Thomas
*
*/
@RunWith(MockitoJUnitRunner.class)
public class TestShoutingManager {
@InjectMocks
private ShoutingManager shoutingManager;
@Mock
private DirtyWordService dirtyWordService;
@Before
public void setUp() throws DirtyWordsExhaustedException{
when(dirtyWordService.getADirtyWord()).thenThrow(new DirtyWordsExhaustedException("To test the dirty words exhausted exception"));
}
@Test(expected = DirtyWordsExhaustedException.class)
public void shouldGetDirtyWordsExhaustedException() throws DirtyWordsExhaustedException{
shoutingManager.getADirtyWord();
}
}

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