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10.4.2 ProjectDatabaseTestCase
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You saw our ProjectDatabaseTestCase in the previous section. In this section you ll flesh it out and create a subclass suitable for testing your EventDao class. To begin, it s important to understand why you needed to subclass DBUnit s DatabaseTestCase in the first place. In your unit tests thus far you have one XML file per test case, which allows you to isolate the test data for each test case. In our experience, having a massive XML file containing test data for all unit tests quickly becomes cumbersome. Having a base class for your tests cases to extend allows you to centralize the logic used to load the dataset. With the administration functions located in a superclass, your test cases can focus on testing functionality. Listing 10.7 shows the complete ProjectDatabaseTestCase. Listing 10.7 ProjectDatabaseTestCase
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package com.manning.hq.ch10; import org.dbunit.DatabaseTestCase;
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import org.dbunit.database.IDatabaseConnection; import org.dbunit.database.DatabaseConnection; import org.dbunit.operation.DatabaseOperation; import import import import java.io.InputStream; java.sql.Connection; java.sql.DriverManager; java.util.Properties;
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public abstract class ProjectDatabaseTestCase extends DatabaseTestCase { private static String driver = "hibernate.connection.driver_class"; private static String url = "hibernate.connection.url"; private static String username = "hibernate.connection.username"; private static String password = "hibernate.connection.password"; public ProjectDatabaseTestCase(String name) { super(name); } protected abstract String getDataSetFilename(); protected IDataSet getDataSet() throws Exception { String file = getDataSetFilename(); if (file == null) { return null; } else { InputStream fileStream = loadFromClasspath(file); InputStream dtdStream = loadFromClasspath("database-schema.xml"); return new FlatXmlDataSet(fileStream, dtdStream); } } protected DatabaseOperation getSetUpOperation() { return DatabaseOperation.REFRESH; } protected DatabaseOperation getTearDownOperation() {
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return DatabaseOperation.DELETE_ALL; } protected IDatabaseConnection getConnection() throws Exception { Properties p = new Properties(); p.load(loadFromClasspath("hibernate.properties")); Class.forName(p.getProperty(driver)); Connection c = DriverManager.getConnection(p.getProperty(url), p.getProperty(username), p.getProperty(password)); return new DatabaseConnection(c); } private InputStream loadFromClasspath(String s) throws Exception { ClassLoader cl = Thread.currentThread().getContextClassLoader(); return cl.getResourceAsStream(s); } }
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The getConnection() method, returning an instance of DBUnit s IDatabaseConnection class, is also an abstract method inherited from DatabaseTestCase. You create a JDBC connection and wrap it with an instance of DatabaseConnection, another DBUnit class. While your Hibernate classes won t use the connection, your test code will use it to verify that your Hibernate operations actually impacted the database. The base class also overrides two methods from DatabaseTestCase: getSetUpOperation() and getTearDownOperation(). These two methods define the operations that DBUnit will use to set up and tear down the database state before and after each test, respectively. This is significant because, as we ve explained several times, you need to ensure the state of the database before and after each test. The default implementation is to refresh data before each test and delete everything after each test completes.
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Now let s implement the new TestEventDao class.
TestEventDao
The updated version of the TestEventDao class, which subclasses ProjectDatabaseTestCase, is shown in listing 10.8. Listing 10.8 Updated TestEventDao class
public class TestEventDao extends ProjectDatabaseTestCase { private EventDao eventDao; public TestEventDao(String name) { super(name); } public String getDataSetFilename() { return "TestEventDao.xml"; } public void setUp() throws Exception { super.setUp(); eventDao = new EventDao(); } Defines the name of the test data file Verifies the number of results
Retrieves the Events for a certain date public void testFindEventsFor () throws Exception { List eventsFor = eventDao.findEventsFor(7, 2005); assertEquals("Should return 1", 1, eventsFor.size()); Event event = (Event) eventsFor.get(0); assertEquals("ID should be 1000", new Long(1000), event.getId()); Verifies that the Event id } matches your assertion }
If you compare the testFindEventsFor() method with the one found in section 10.3.3, you can see that it skips loading the test data and restoring the state of the database. You re almost ready to run this test case. Before you can test, you must define your test data. The XML file shown here contains three entries for the events table that are similar to the Event instances created when you used vanilla JUnit in section 10.3.3:
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