Testing the Service Layer - the Foo service unit test

FooServiceUnitTest.java

public class FooServiceUnitTest{
   
   FooService instance;
   
   private HibernateTemplate hibernateTemplateMock;
   
   @Before
   public final void before(){
      this.instance = new FooService();
      this.instance.dao = new FooDAO();
      this.hibernateTemplateMock = mock( HibernateTemplate.class );
      this.instance.dao.setHibernateTemplate( this.hibernateTemplateMock );
   }
   
   @Test
   public final void whenCreateIsTriggered_thenNoException(){
      // When
      this.instance.create( new Foo( "testName" ) );
   }
	
   @Test( expected = NullPointerException.class )
   public final void whenCreateIsTriggeredForNullEntity_thenException(){
      // When
      this.instance.create( null );
   }
   
   @Test
   public final void whenCreateIsTriggered_thenEntityIsCreated(){
      // When
      final Foo entity = new Foo( "testName" );
      this.instance.create( entity );
      
      // Then
      final ArgumentCaptor< Foo > argument = ArgumentCaptor.forClass( Foo.class );
      verify( this.hibernateTemplateMock ).save( argument.capture() );
      assertThat( entity, is( argument.getValue() ) );
   }
   
}

This gist is used in:
http://www.baeldung.com/2011/10/02/testing-the-service-layer/