TestUserServiceSpyV1

TestUserServiceSpy.java

public class TestUserServiceWithSpies {
	private static final Email EMAIL = new Email("user@company.com");
	private static final User NO_FOUND_USER = new NoUser();
	private static final User USER = null;

	private final class StubUserDaoThatDoesntFoundUser implements UserDAO {

		public User findUserBy(Email email) {
			return NO_FOUND_USER;
		}

		public User createWith(Email email) {
			// this isn't important for this example
			return USER;
		}
	}

	private final class SpyEmailService implements EmailService {
		private boolean sentEmail = false;

		public void sendEmailTo(User user) {
			this.sentEmail = true;
		}

		public boolean wasSentEmail() {
			return sentEmail;
		}
	}

	@Test
	public void //
	should_send_an_email_when_a_user_was_created() throws Exception {
		UserDAO stubUserDAO = new StubUserDaoThatDoesntFoundUser();
		SpyEmailService spyEmailService = new SpyEmailService();
		UserService userService = new UserService(stubUserDAO, spyEmailService);

		userService.findOrCreateWith(EMAIL);

		assertThat(spyEmailService.wasSentEmail(), is(true));
	}

}