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Listing 14-4. Creating a Test-specific Version of a Business Interface public class VacationBeanTest { @Test public void testYearsOfService() throws Exception { VacationBean bean = new VacationBean(); bean.empService = new EmployeeService() { public Employee findEmployee(int id) { Employee emp = new Employee(); emp.setStartDate(new Time(System.currentTimeMillis() VacationBean.MILLIS_PER_YEAR * 5)); return emp; } // ... }; int yearsOfService = bean.getYearsOfService(0); Assert.assertEquals(5, yearsOfService);

Servlet Filter It is possible to solve some of the requirements mentioned earlier with filters that are built into the servlet API. All modern web servers provide support for filters code that is executed before control passes to a target servlet, after control leaves the servlet, or both.

// ...

The EntityManager and Query interfaces present a challenge to developers writing unit tests. Code that interacts with the entity manager can vary from the simple (persisting an object) to the complex (issuing a JP QL query and obtaining the results). There are two basic approaches to dealing with the presence of standard interfaces: Introduce a subclass that replaces methods containing entity manager or query operations with test-specific versions that do not interact with JPA. Provide custom implementations of standard interfaces that may be predictably used for testing.

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n our simple example programs in 1 and 3, we demonstrated how a mapping file could be used to establish the relationship between the object model and the database schema. A mapping file can map a single class or multiple classes to the database. The mapping can also describe standard queries (in HQL and in SQL) and filters.

In fact, it is possible to configure a chain of filters to be executed for each request, as shown in Figure 3-12.

Before covering these strategies in detail, consider the session bean implementation shown in Listing 14-5 that provides a simple authentication service. For such a simple class, it is surprisingly challenging to unit test. The entity manager operations are embedded directly within the authenticate() method, coupling the implementation to JPA. Listing 14-5. Session Bean that Performs Basic Authentication @Stateless public class UserServiceBean implements UserService { @PersistenceContext(unitName="EmployeeService") EntityManager em; public User authenticate(String userId, String password) { User user = em.find(User.class, userId); if (user != null) { if (password.equals(user.getPassword())) {

} return null;

Filters are pluggable components that provide preprocessing and postprocessing support around a servlet. This technique works with JSPs too, because they are effectively servlets. The filters are configured in web.xml without affecting the existing application code. Listing 3-42 shows the servlet filter used to add time-based access to the production application.

return user;

Although we have referred to the Hibernate types in passing, we have not discussed the terminology in any depth. In order to express the behavior of the mapping file elements, we need to make these fine distinctions explicit. Hibernate types fall into three broad categories: entities, components, and values.

The first technique we will demonstrate to make this class testable is to introduce a subclass that eliminates entity manager calls. For the UserServiceBean example shown in Listing 14-5, entity manager access must first be isolated to a separate method before it can be tested. Listing 14-6 demonstrates such a refactoring. Listing 14-6. Isolating Entity Manager Operations for Testing @Stateless public class UserServiceBean implements UserService { @PersistenceContext(unitName="EmployeeService") EntityManager em; public User authenticate(String userId, String password) { User user = findUser(userId); // ... } User findUser(String userId) { return em.find(User.class, userId); }

public class TimebasedAccessFilter implements Filter { private int startHour; private int endHour; public void destroy() {} public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { int currentHrofDay = Calendar.getInstance().get(Calendar.HOUR_OF_DAY); if((startHour <= currentHrofDay) && (currentHrofDay <= endHour)){ chain.doFilter(request, response); } else{

With this refactoring complete, the authenticate() method no longer has any direct dependency on the entity manager. The UserServiceBean class can now be subclassed for testing, replacing the findUser() method with a test-specific version that returns a well-known result. Listing 14-7 demonstrates a complete test case using this technique. Listing 14-7. Using a Subclass to Eliminate Entity Manager Dependencies public class UserServiceTest { static final String USER_ID = "test_id"; static final String PASSWORD = "test_password"; static final String INVALID_USER_ID = "test_user"; @Test public void testAuthenticateValidUser() throws Exception { TestUserService service = new TestUserService(); User user = service.authenticate(USER_ID, PASSWORD); Assert.assertNotNull(user); Assert.assertEquals(USER_ID, user.getName()); Assert.assertEquals(PASSWORD, user.getPassword()); } @Test public void testAuthenticateInvalidUser() throws Exception { TestUserService service = new TestUserService(); User user = service.authenticate(INVALID_USER_ID, PASSWORD);

Assert.assertNull(user);

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