Mockito – Verify arguments passed to mocks using ArgumentCaptor

In certain scenarios like if we have no control or handle of argument passed into a mock we can use Mockito ArgumentCaptor to verify if certain arguments where passed to mocks.

The complete source code used in this article can be cloned from github

package com.ourownjava.tdd.mockito.capture;
/**
*
* @author Sanju Thomas
*
*/
public class EMailSender {
private EMailService emailService;
public void send(final String[] toAddresses, final String subject, final String content){
emailService.send(new Email(toAddresses, subject, content));
}
public class Email {
private Email(final String[] toAddresses, final String subject, final String content){
this.toAdrresses = toAddresses;
this.subject = subject;
this.content = content;
}
private String [] toAdrresses;
private String subject;
private String content;
public String[] getToAdrresses() {
return toAdrresses;
}
public void setToAdrresses(String[] toAdrresses) {
this.toAdrresses = toAdrresses;
}
public String getSubject() {
return subject;
}
public void setSubject(String subject) {
this.subject = subject;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
}

package com.ourownjava.tdd.mockito.capture;
import com.ourownjava.tdd.mockito.capture.EMailSender.Email;
/**
*
* @author Sanju Thomas
*
*/
public interface EMailService {
public void send(final Email email);
}

package com.ourownjava.tdd.mockito.captor;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.verify;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Captor;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;
import com.ourownjava.tdd.mockito.capture.EMailSender;
import com.ourownjava.tdd.mockito.capture.EMailService;
/**
*
* @author Sanju Thomas
*
*/
@RunWith(MockitoJUnitRunner.class)
public class TestEmailSender {
@Mock
private EMailService eMailService;
@InjectMocks
private EMailSender eMailSender;
@Captor
private ArgumentCaptor emailCaptor;
@Before
public void setUp(){
}
@Test
public void shouldConstructEmailObjectAndSendEmail(){
eMailSender.send(new String [] {"test@test.com"}, "test", "mockito argument captor test");
verify(eMailService).send(emailCaptor.capture());
assertArrayEquals(new String [] {"test@test.com"}, emailCaptor.getValue().getToAdrresses());
assertEquals("test", emailCaptor.getValue().getSubject());
assertEquals("mockito argument captor test", emailCaptor.getValue().getContent());
}
}

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