Junit to test Spring service and DAO layer

Question

I am working on a Spring application (Spring 3.0) and following layered architecture i.e. Controller -> Service -> DAO layers.

I want to write unit test cases for service and DAO layer using Junit.
I checked Spring official site and also tried many other sites but couldn't figure out an easy and simple way of doing it.

Can anybody provide me some helpful resources ?

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EDIT :
Looks like Mockito is the good option. Any good link to use it in Spring.

Thank you Alex for suggesting it.

• Mocking Hibernate DAO

Answer 1

In terms of resources the Spring documentation on testing is very good. This can be found here.

When you test your service layer you will want to use a mocking library such as Mockito to mock your DAOs and therefore your domain layer. This ensures that they are true unit tests.

Then to integration test your DAOs against a database you can use the Spring transactional test utilities described in that reference documentation.

Answer 2

Don't know much about resources, but it's not that hard to do if you have your dao + spring setup nicely. You'll need the following:

1. JUNIT dependencies obivously. with maven, something like that:

   <dependency>     <groupId>junit</groupId>     <artifactId>junit</artifactId>     <version>4.8.2</version> </dependency> 

2. The test class, which you place inside src/test/java:

   @TransactionConfiguration(defaultRollback = true) @ContextConfiguration({ "classpath:test-spring-context.xml" }) @Transactional   @RunWith(SpringJUnit4ClassRunner.class)   public class SomeTests {      // ... } 

3. The context file for your spring setup referencing your DAO datasource placed inside src/test/resources. Somewhere in your test-spring-context.xml:

   <import resource="datasource-test.xml" /> 

Now for example in eclipse you can run the project as a JUNIT test.

Need more details? Is this solution applicable?