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public class NewsItemTest { @Configuration(beforeTestClass = true) protected void setUp() throws ConfigurationException { ConfigurationLoader.loadMapping( new File(Paths.BASEDIR + "/dd/dynadto/NewsItem.dto.xml")); } @SuppressWarnings("unchecked") @Test(groups = {"dto"}) public void testNewsItemCreation() { // utility objects Date today = new Date(); // create a News domain object News news = new News(); news.setId(1); news.setUserId(4); news.setTitle("this is the title"); news.setBody("this body"); news.setConferenceId(1); news.setCreatedOn(today); news.setDate(today); news.setIsGlobal(false); news.setIsPublished(true); news.setRemoveOn(today); Builder builder = BuilderFactory.getInstance().getBuilder(NewsItem.class); NewsItem newsItem = (NewsItem) builder.build(news); Assert.assertEquals(news.getId(), newsItem.getId()); Assert.assertEquals(news.getTitle(), newsItem.getTitle()); Assert.assertEquals(news.getBody(), newsItem.getBody()); Assert.assertEquals(news.getConferenceId().intValue(), newsItem.getConferenceId()); Assert.assertEquals(news.getCreatedOn(), newsItem.getCreatedOn()); Assert.assertEquals(news.getDate(), newsItem.getDate()); Assert.assertEquals(news.getUserId().intValue(), newsItem.getUserId()); Assert.assertEquals(news.getIsGlobal(), newsItem.getIsGlobal()); Assert.assertEquals(news.getIsPublished().booleanValue(), newsItem.getIsPublished()); Assert.assertEquals(news.getRemoveOn(), newsItem.getRemoveOn()); } }
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One of the advantages of EJB3 being POJOs is that it makes testing them almost as easy as it is to test any other Java class. To demonstrate how to test a EJB3 SLSB we ll make use of mock objects. Mock objects are test-oriented objects that serve as stand-ins for the collaborating objects or the unit being tested. The technique has been around for a while, but it was formalized by Tim Mackinnon, Steve Freeman, and Philip Craig in a paper presented at an Extreme Programming conference in 2000. Mock objects are more than stubs in that they are more than a simple holder of data. Mock objects simulate part of the behavior of a collaborator and also provide for a way to verify the behavior. Mock objects can be used as stubs, but their real power lies in testing the interactions between a class and its collaborators. Unit testing is about testing the units of a system in isolation, but in most cases a unit s behavior can be tested only in the context of its interactions with collaborating objects. Mock objects provide a way to provide a testing-time replacement for a facet of the behavior provided by a collaborating object. Most of the EJB services in the TechConf system depend on DAOs to retrieve data from the database. In order to mock these DAO collaborators we ll use the EasyMock 2 library, which is a mock-objects library that can dynamically generate a mock object for a given interface. EasyMock 2 can be downloaded from www.easymock.org. To use EasyMock, simply add the easymock.jar file to your classpath. As an example of how to test an EJB3 SLSB, we ll use the LocationLookupServiceBean, which uses an instance of the ZipcodeDAO interface as a collaborator to retrieve data from the database. The EJB also uses the DynaDTO library to create DTOs to be returned to the EJB clients. Listing 8-26 shows the LocationLookupServiceBean. Listing 8-26. The LocationLookupServiceBean EJB package com.integrallis.techconf.ejb; import import import import import import import import import import import java.util.List; javax.annotation.EJB; javax.annotation.Resource; javax.ejb.PostConstruct; javax.ejb.Stateless; org.dynadto.Builder; org.dynadto.BuilderFactory; com.integrallis.techconf.dao.ZipcodeDAO; com.integrallis.techconf.domain.Zipcode; com.integrallis.techconf.dto.Location; com.integrallis.techconf.service.LocationLookupService;
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@Stateless public class LocationLookupServiceBean implements LocationLookupService {
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@Resource(name = "java:/dynadto/BuilderFactory") protected BuilderFactory builderFactory; // DAOs @EJB protected ZipcodeDAO zipcodeDAO; // DynaDTO Builders protected Builder locationBuilder; @PostConstruct public void initialization() { locationBuilder = builderFactory.getBuilder(Location.class); } @SuppressWarnings("unchecked") public List<Location> searchLocations(String zipCode) { List<Zipcode> entities = zipcodeDAO.find(zipCode); return locationBuilder.buildList(entities); } public Location getLocationByZipCode(String zipCode) { Integer id = Integer.parseInt(zipCode); Zipcode zip = zipcodeDAO.getById(id); Location location = null; if (zip != null) { location = (Location) locationBuilder.build(zip); } return location; } public void setZipcodeDAO(ZipcodeDAO zipcodeDAO) { this.zipcodeDAO = zipcodeDAO; } public void setBuilderFactory(BuilderFactory builderFactory) { this.builderFactory = builderFactory; } } Without a database present, we need to create a mock for the ZipcodeDAO collaborator. To create a proxy class that can be treated as the required DAO, we can use the following snippet of code: ZipcodeDAO mock = createMock(ZipcodeDAO.class); To make the createMock static method available to your test class, you need to use a static import (which allows unqualified access to static members) as shown next:
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