2 * Copyright 2005-2010 the original author or authors.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package org.wamblee.support.persistence;
18 import javax.sql.DataSource;
20 import org.dbunit.IDatabaseTester;
23 * This class is the entry point for JPA tests. Test code should construct a
24 * JpaTester in the <code>@Before</code> method and call {@link #start()} on it
25 * in that method. Also, test code should call {@link #stop()} on it in the
26 * <code>@After</code> method.
28 * This class is constructed with a description of the persistence unit to be
29 * tested. The principle is that an existing <code>persistence.xml</code> can be
30 * tested without change in unit test code.
32 * It then takes care of the following:
34 * <li>Creating an inmemory database for testing (default) or connecting to an
35 * external database. See {@link DatabaseBuilder} for more information on how a
36 * databse is obtained.</li>
37 * <li>Drop all database tables that are related to the persistence unit under
38 * test, including JPA provider specific tables.</li>
39 * <li>Creating a datasource for the database and make the datasource available
41 * <li>Creating the entity manager factory for JPA and configuring it in such a
42 * way that schema creation happens. (Typically, schema creation will be
43 * disabled in the persistence.xml but this utility enables it for unit test).</li>
44 * <li>Creating a DBUnit database tester which is appropriately configured for
45 * the persistence unit under test.</li>
48 * The main entry point for all this functionality is the
49 * {@link PersistenceUnitDescription} which describes the persistence unit and
50 * must be provided at construction of the <code>JpaTester</code>
52 * NOTE: Persistence XML files should be explicitly configured with the classes
53 * that are part of the persistence unit since scanning of classes does not work
54 * correctly in a unit test environment. This is currently the only limitation.
56 public class JpaTester {
58 private PersistenceUnitDescription persistenceUnit;
60 private DataSource dataSource;
61 private DatabaseUtils dbUtils;
62 private JpaBuilder jpaBuilder;
63 private IDatabaseTester dbTester;
66 * Constructs the tester.
68 * @param aPersistenceUnit
69 * Persistence unit under test.
71 public JpaTester(PersistenceUnitDescription aPersistenceUnit) {
72 persistenceUnit = aPersistenceUnit;
76 * Starts the tester. This must be called prior to running the test.
80 public void start() throws Exception {
81 db = DatabaseBuilder.getDatabase();
82 dataSource = db.start();
84 dbUtils = new DatabaseUtils(dataSource, persistenceUnit.getTables());
86 dbUtils.dropTables(JpaCustomizerBuilder.getCustomizer().getJpaTables());
88 jpaBuilder = new JpaBuilder(dataSource, persistenceUnit);
91 // db tester should be created after Jpa builder because jpa builder
93 // tables that the tester looks at when it is initialized.
94 dbTester = dbUtils.createDbTester();
98 * Stops the tester. This must be called after the test.
101 if (jpaBuilder != null) {
109 public Database getDb() {
113 public DataSource getDataSource() {
117 public IDatabaseTester getDbTester() {
121 public DatabaseUtils getDbUtils() {
125 public JpaBuilder getJpaBuilder() {
129 public PersistenceUnitDescription getPersistenceUnit() {
130 return persistenceUnit;