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Unit testing with JUnit and DBUnit
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HibernateFactory.close(session); HibernateFactory.close(session2); } }
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Overall, the testPersists() method creates an Event, saves it, loads it, and finally cleans up and deletes it. So if it works, it verifies a number of the conditions we mentioned in section 10.3.1. Here s a detailed breakdown:
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B You initialize the
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and create two different sessions. Why two Remember that sessions keep an in-memory cache of all the objects that they save or load for performance reasons. So if you saved an event and then loaded it through the same session, it wouldn t really tell you that the new row was created in the database. Using a second session is one way to verify it s a complete trip to the database.
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C Here you create your event and give it some sample data. D Next, you save the event and flush the changes to the database. E Here you load the event through the second session, using the primary
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key that was assigned to the event object by Hibernate.
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F Do a few tests to make sure the object was returned (not null), and that
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it matches the id and name field. You can easily verify that other fields are persisting as well by adding them to the method, just like the name field.
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G After your test is done, you need to clean up after yourself. You want to
reset the database to its original state before the test so that you don t alter the behavior of other unit tests. So you delete the event that you created and close the sessions. That s a sample unit test in a nutshell. It certainly could use a bit of refactoring, but it gets the job done. Some potential points of refactoring include moving the setup of data and cleanup into JUnit s setUp() and tearDown() methods, which you ll see in section 10.3.4.
Testing the persistence layer
10.3.3 Testing queries
Much like testing basic persistence, you can also do tests to verify that your queries work correctly. The general rule to follow involves putting a few objects into the database, some of which should be returned and others that will not. This allows you to avoid both false positives and negatives, where a query returns either too much or too little data. Assume for a moment that you want to test the findEventsFor() method from the EventDao class in chapter 8, which looked like this:
public List findEventsFor(int month, int year);
It returns all Events based on a Date for a given month and year. Under the covers, it uses an HQL query that looks something like this:
from Event event where event.startDate >= :firstDay and event.startDate < :lastDay
You want to verify that the HQL is written correctly and that your method works as expected, so you need to write a unit test for it. Go ahead and create a TestEventDao (listing 10.4) in the same directory as the TestEvent class. Listing 10.4, with a testEventsFor() method
package com.manning.hq.ch10; import import import import import import java.util.List; org.hibernate.Session; com.manning.hq.ch10.HibernateFactory; com.manning.hq.ch10.EventDao; com.manning.hq.ch10.DateUtils; junit.framework.TestCase;
public void testFindEventsFor() throws Exception{ Event eventBefore = new Event(); Creates three events Event eventIn = new Event(); Sets dates for Event eventAfter = new Event(); months being testing eventBefore.setStartDate(DateUtils.newDate(6, 1, 2005)); eventIn.setStartDate(DateUtils.newDate(7, 1, 2005));
Unit testing with JUnit and DBUnit
eventAfter.setStartDate(DateUtils.newDate(8, 1, 2005)); EventDao eventDao = new EventDao(); Session session = HibernateFactory.openSession(); try {; Persists the test events;; session.flush();
Runs the query
List eventsFor = eventDao.findEventsFor(7, 2005); assertEquals("Should return 1", 1, eventsFor.size()); Event actualEvent = (Event) eventsFor.get(0); assertEquals("Should be eventIn, not the other events.", eventIn.getId(), actualEvent.getId()); Verifies the results of } finally { the query session.delete(eventBefore); Cleans up session.delete(eventIn); session.delete(eventAfter); session.flush(); HibernateFactory.close(session); } }
Let s review the code more in depth. First, by creating three events, you can test that the query returns events in the given month, but not those from the two surrounding months. Note that you save the months using the session, rather than the EventDao, since you re testing the findEventsFor(), not the create() or delete() method. After running the query, check the size of the results list. Verify that only one event is returned, and that the event you expected was the one returned. Note that there is a pretty big assumption underlying this test: as it s written, you might get false negatives. In other words, this method can actually fail, even though the findEventsFor() method works correctly. If there are excess objects (events) in the database (maybe from other tests), they could be returned by the query, causing failures. We discuss ways to avoid this in the next section.
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