[Unit Testing Java] Unit testing with Mockito vs. integration testing
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Service:
package com.example.ec.service;
import com.example.ec.domain.Tour;
import com.example.ec.domain.TourRating;
import com.example.ec.repo.TourRatingRepository;
import com.example.ec.repo.TourRepository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import javax.transaction.Transactional;
import java.util.*;
/**
* Tour Rating Service
*
* Created by Mary Ellen Bowman.
*/
@Service
@Transactional
public class TourRatingService {
private TourRatingRepository tourRatingRepository;
private TourRepository tourRepository;
/**
* Construct TourRatingService
*
* @param tourRatingRepository Tour Rating Repository
* @param tourRepository Tour Repository
*/
@Autowired
public TourRatingService(TourRatingRepository tourRatingRepository, TourRepository tourRepository) {
this.tourRatingRepository = tourRatingRepository;
this.tourRepository = tourRepository;
}
/**
* Create a new Tour Rating in the database
*
* @param tourId tour identifier
* @param customerId customer identifier
* @param score score of the tour rating
* @param comment additional comment
* @throws NoSuchElementException if no Tour found.
*/
public void createNew(int tourId, Integer customerId, Integer score, String comment) throws NoSuchElementException {
tourRatingRepository.save(new TourRating(verifyTour(tourId), customerId,
score, comment));
}
/**
* Get All Ratings.
*
* @return List of TourRatings
*/
public List<TourRating> lookupAll() {
return tourRatingRepository.findAll();
}
public Optional<TourRating> lookupRatingById(int id) {
return tourRatingRepository.findById(id);
}
/**
* Get a page of tour ratings for a tour.
*
* @param tourId tour identifier
* @param pageable page parameters to determine which elements to fetch
* @return Page of TourRatings
* @throws NoSuchElementException if no Tour found.
*/
public Page<TourRating> lookupRatings(int tourId, Pageable pageable) throws NoSuchElementException {
return tourRatingRepository.findByTourId(verifyTour(tourId).getId(), pageable);
}
/**
* Update some of the elements of a Tour Rating.
*
* @param tourId tour identifier
* @param score score of the tour rating
* @param comment additional comment
* @return Tour Rating Domain Object
* @throws NoSuchElementException if no Tour found.
*/
public TourRating update(int tourId, Integer customerId, Integer score, String comment) throws NoSuchElementException {
TourRating rating = verifyTourRating(tourId, customerId);
rating.setScore(score);
rating.setComment(comment);
return tourRatingRepository.save(rating);
}
/**
* Update all of the elements of a Tour Rating.
*
* @param tourId tour identifier
* @param customerId customer identifier
* @param score score of the tour rating
* @param comment additional comment
* @return Tour Rating Domain Object
* @throws NoSuchElementException if no Tour found.
*/
public TourRating updateSome(int tourId, Integer customerId, Integer score, String comment)
throws NoSuchElementException {
TourRating rating = verifyTourRating(tourId, customerId);
if (score != null) {
rating.setScore(score);
}
if (comment!= null) {
rating.setComment(comment);
}
return tourRatingRepository.save(rating);
}
/**
* Delete a Tour Rating.
*
* @param tourId tour identifier
* @param customerId customer identifier
* @throws NoSuchElementException if no Tour found.
*/
public void delete(int tourId, Integer customerId) throws NoSuchElementException {
TourRating rating = verifyTourRating(tourId, customerId);
tourRatingRepository.delete(rating);
}
/**
* Get the average score of a tour.
*
* @param tourId tour identifier
* @return average score as a Double.
* @throws NoSuchElementException
*/
public Double getAverageScore(int tourId) throws NoSuchElementException {
List<TourRating> ratings = tourRatingRepository.findByTourId(verifyTour(tourId).getId());
OptionalDouble average = ratings.stream().mapToInt((rating) -> rating.getScore()).average();
return average.isPresent() ? average.getAsDouble():null;
}
/**
* Service for many customers to give the same score for a service
* @param tourId
* @param score
* @param customers
*/
public void rateMany(int tourId, int score, Integer [] customers) {
Tour tour = tourRepository.findById(tourId).orElseThrow(() -> new NoSuchElementException("rateMany, no valid tourId"));
for (Integer c : customers) {
tourRatingRepository.save(new TourRating(tour, c, score));
}
}
/**
* Verify and return the Tour given a tourId.
*
* @param tourId
* @return the found Tour
* @throws NoSuchElementException if no Tour found.
*/
private Tour verifyTour(int tourId) throws NoSuchElementException {
return tourRepository.findById(tourId).orElseThrow(() ->
new NoSuchElementException("Tour does not exist " + tourId)
);
}
/**
* Verify and return the TourRating for a particular tourId and Customer
* @param tourId
* @param customerId
* @return the found TourRating
* @throws NoSuchElementException if no TourRating found
*/
private TourRating verifyTourRating(int tourId, int customerId) throws NoSuchElementException {
return tourRatingRepository.findByTourIdAndCustomerId(tourId, customerId).orElseThrow(() ->
new NoSuchElementException("Tour-Rating pair for request("
+ tourId + " for customer" + customerId));
}
}
Unit testing:
package com.example.ec.service;
import com.example.ec.domain.Tour;
import com.example.ec.domain.TourRating;
import com.example.ec.repo.TourRatingRepository;
import com.example.ec.repo.TourRepository;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnitRunner;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import java.util.Arrays;
import java.util.Optional;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.*;
@RunWith(MockitoJUnitRunner.class)
public class TourRatingServiceTest {
private static final int CUSTOMER_ID = 123;
private static final int TOUR_ID = 1;
private static final int TOUR_RATING_ID = 100;
@Mock
private TourRepository tourRepositoryMock;
@Mock
TourRatingRepository tourRatingRepositoryMock;
// will inject tourRepositoryMock, tourRatingRepositoryMock to service
@InjectMocks
private TourRatingService service;
@Mock
private Tour tourMock;
@Mock
private TourRating tourRatingMock;
/**
* Mock Response to commonly invoked methods
*/
@Before
public void setupReturnValuesOfMockMethods() {
when(tourRepositoryMock.findById(TOUR_ID)).thenReturn(Optional.of(tourMock));
when(tourMock.getId()).thenReturn(TOUR_ID);
when(tourRatingRepositoryMock.findByTourIdAndCustomerId(TOUR_ID,CUSTOMER_ID)).thenReturn(Optional.of(tourRatingMock));
when(tourRatingRepositoryMock.findByTourId(TOUR_ID)).thenReturn(Arrays.asList(tourRatingMock));
}
@Test
public void lookupRatingById() {
when(tourRatingRepositoryMock.findById(TOUR_RATING_ID)).thenReturn(Optional.of(tourRatingMock));
//invoke and verify lookupRatingById
assertThat(service.lookupRatingById(TOUR_RATING_ID).get(), is(tourRatingMock));
}
@Test
public void lookupAll() {
when(tourRatingRepositoryMock.findAll()).thenReturn(Arrays.asList(tourRatingMock));
//invoke and verify lookupAll
assertThat(service.lookupAll().get(0), is(tourRatingMock));
}
@Test
public void getAverageScore() {
when(tourRatingMock.getScore()).thenReturn(10);
//invoke and verify getAverageScore
assertThat(service.getAverageScore(TOUR_ID), is(10.0));
}
@Test
public void lookupRatings() {
//create mocks of Pageable and Page (only needed in this test)
Pageable pageable = mock(Pageable.class);
Page page = mock(Page.class);
when(tourRatingRepositoryMock.findByTourId(1, pageable)).thenReturn(page);
//invoke and verify lookupRatings
assertThat(service.lookupRatings(TOUR_ID, pageable), is(page));
}
/**************************************************************************************
*
* Verify the invocation of dependencies.
*
**************************************************************************************/
@Test
public void delete() {
//invoke delete
service.delete(1,CUSTOMER_ID);
//verify tourRatingRepository.delete invoked
verify(tourRatingRepositoryMock).delete(any(TourRating.class));
}
@Test
public void rateMany() {
//invoke rateMany
service.rateMany(TOUR_ID, 10, new Integer[]{CUSTOMER_ID, CUSTOMER_ID + 1});
//verify tourRatingRepository.save invoked twice
verify(tourRatingRepositoryMock, times(2)).save(any(TourRating.class));
}
@Test
public void update() {
//invoke update
service.update(TOUR_ID,CUSTOMER_ID,5, "great");
//verify tourRatingRepository.save invoked once
verify(tourRatingRepositoryMock).save(any(TourRating.class));
//verify and tourRating setter methods invoked
verify(tourRatingMock).setComment("great");
verify(tourRatingMock).setScore(5);
}
@Test
public void updateSome() {
//invoke updateSome
service.updateSome(TOUR_ID, CUSTOMER_ID, 1, "awful");
//verify tourRatingRepository.save invoked once
verify(tourRatingRepositoryMock).save(any(TourRating.class));
//verify and tourRating setter methods invoked
verify(tourRatingMock).setComment("awful");
verify(tourRatingMock).setScore(1);
}
/**************************************************************************************
*
* Verify the invocation of dependencies
* Capture parameter values.
* Verify the parameters.
*
**************************************************************************************/
@Test
public void createNew() {
//prepare to capture a TourRating Object
ArgumentCaptor<TourRating> tourRatingCaptor = ArgumentCaptor.forClass(TourRating.class);
//invoke createNew
service.createNew(TOUR_ID, CUSTOMER_ID, 2, "ok");
//verify tourRatingRepository.save invoked once and capture the TourRating Object
verify(tourRatingRepositoryMock).save(tourRatingCaptor.capture());
//verify the attributes of the Tour Rating Object
assertThat(tourRatingCaptor.getValue().getTour(), is(tourMock));
assertThat(tourRatingCaptor.getValue().getCustomerId(), is(CUSTOMER_ID));
assertThat(tourRatingCaptor.getValue().getScore(), is(2));
assertThat(tourRatingCaptor.getValue().getComment(), is("ok"));
}
}
Integration testing:
package com.example.ec.service;
import com.example.ec.domain.TourRating;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.dao.DataIntegrityViolationException;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
import java.util.NoSuchElementException;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
/**
* Created by Mary Ellen Bowman
*/
@RunWith(SpringRunner.class)
@SpringBootTest
@Transactional
public class TourRatingServiceIntegrationTest {
private static final int CUSTOMER_ID = 456;
private static final int TOUR_ID = 1;
private static final int NOT_A_TOUR_ID = 123;
@Autowired
private TourRatingService service;
//Happy Path delete existing TourRating.
@Test
public void delete() {
List<TourRating> tourRatings = service.lookupAll();
service.delete(tourRatings.get(0).getTour().getId(), tourRatings.get(0).getCustomerId());
assertThat(service.lookupAll().size(), is(tourRatings.size() - 1));
}
//UnHappy Path, Tour NOT_A_TOUR_ID does not exist
@Test(expected = NoSuchElementException.class)
public void deleteException() {
service.delete(NOT_A_TOUR_ID, 1234);
}
//Happy Path to Create a new Tour Rating
@Test
public void createNew() {
//would throw NoSuchElementException if TourRating for TOUR_ID by CUSTOMER_ID already exists
service.createNew(TOUR_ID, CUSTOMER_ID, 2, "it was fair");
//Verify New Tour Rating created.
TourRating newTourRating = service.verifyTourRating(TOUR_ID, CUSTOMER_ID);
assertThat(newTourRating.getTour().getId(), is(TOUR_ID));
assertThat(newTourRating.getCustomerId(), is(CUSTOMER_ID));
assertThat(newTourRating.getScore(), is(2));
assertThat(newTourRating.getComment(), is ("it was fair"));
}
//UnHappy Path, Tour NOT_A_TOUR_ID does not exist
@Test(expected = NoSuchElementException.class)
public void createNewException() {
service.createNew(NOT_A_TOUR_ID, CUSTOMER_ID, 2, "it was fair");
}
//Happy Path many customers Rate one tour
@Test
public void rateMany() {
int ratings = service.lookupAll().size();
service.rateMany(TOUR_ID, 5, new Integer[]{100, 101, 102});
assertThat(service.lookupAll().size(), is(ratings + 3));
}
//Unhappy Path, 2nd Invocation would create duplicates in the database, DataIntegrityViolationException thrown
@Test(expected = DataIntegrityViolationException.class)
public void rateManyProveRollback() {
int ratings = service.lookupAll().size();
Integer customers[] = {100, 101, 102};
service.rateMany(TOUR_ID, 3, customers);
service.rateMany(TOUR_ID, 3, customers);
}
//Happy Path, Update a Tour Rating already in the database
@Test
public void update() {
createNew();
TourRating tourRating = service.update(TOUR_ID, CUSTOMER_ID, 1, "one");
assertThat(tourRating.getTour().getId(), is(TOUR_ID));
assertThat(tourRating.getCustomerId(), is(CUSTOMER_ID));
assertThat(tourRating.getScore(), is(1));
assertThat(tourRating.getComment(), is("one"));
}
//Unhappy path, no Tour Rating exists for tourId=1 and customer=1
@Test(expected = NoSuchElementException.class)
public void updateException() throws Exception {
service.update(1, 1, 1, "one");
}
//Happy Path, Update a Tour Rating already in the database
@Test
public void updateSome() {
createNew();
TourRating tourRating = service.update(TOUR_ID, CUSTOMER_ID, 1, "one");
assertThat(tourRating.getTour().getId(), is(TOUR_ID));
assertThat(tourRating.getCustomerId(), is(CUSTOMER_ID));
assertThat(tourRating.getScore(), is(1));
assertThat(tourRating.getComment(), is("one"));
}
//Unhappy path, no Tour Rating exists for tourId=1 and customer=1
@Test(expected = NoSuchElementException.class)
public void updateSomeException() throws Exception {
service.update(1, 1, 1, "one");
}
//Happy Path get average score of a Tour.
@Test
public void getAverageScore() {
assertTrue(service.getAverageScore(TOUR_ID) == 4.0);
}
//UnHappy Path, Tour NOT_A_TOUR_ID does not exist
@Test(expected = NoSuchElementException.class)
public void getAverageScoreException() {
service.getAverageScore(NOT_A_TOUR_ID); //That tour does not exist
}
}
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