Testing Spring-JPA - jpa-2.0

Question

I am developping a web application using Spring (3.1.x), JSF 2, JPA 2 (Hibernate Provider) for tomcat 6.x.
I want to test my DAO classes.
In my DAO class: i do this:
#PersistenceContext
private EntityManager entityManager;
In Spring Configuration;
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
<property name="persistenceUnitName" value="OpenPU" />
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
In persistence.xml
<persistence-unit name="OpenPU" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<non-jta-data-source>java:comp/env/jdbc/mysql_open</non-jta-data-source>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLInnoDBDialect" />
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.transaction.flush_before_completion" value="true"/>
<property name="hibernate.cache.provider_class" value="org.hibernate.cache.HashtableCacheProvider"/>
<property name="hibernate.connection.zeroDateTimeBehavior" value="convertToNull"/>
</properties>
</persistence-unit>
It the first time I make test, and when I test I don't want to use the same persistence unit. I heard about dbunit for using xml data, but i don't understand how to change the persistence unit during the test.
Can you help me or give me some example, tutorial.
Thanks you.

Answer 1

Maybe this tutorial will help.
BTW, there is one interesting Spring feature to fit your needs - embedded database support. So, I usually just use following construction to create in-memory H2 db, create schema with schema.sql and fill it with some data from test-data.sql:
<jdbc:embedded-database id="dataSource" type="H2">
<jdbc:script location="classpath:schema.sql"/>
<jdbc:script location="classpath:test-data.sql"/>
</jdbc:embedded-database>
Then you could use this bean as datasource for you EntityManagerFactory bean:
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
p:dataSource-ref="dataSource"
p:persistence-xml-location="classpath:META-INF/persistence.xml">
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="databasePlatform" value="org.hibernate.dialect.MySQLInnoDBDialect"/>
<property name="showSql" value="true" />
<!-- other properties -->
</bean>
</property>
<property name="persistenceUnitName" value="OpenPU" />
</bean>
This is very convenient and concise way to create in-memory database for tests with Spring.
(don't forget to add H2 in your classpath)
See documentation for details, chapter "13.8 Embedded database support".