It is possible to have the FacesMessages class implements an interface because 
I want to make unit test on my bean with EasyMock (http://www.easymock.org/) 
library and this library can only mock an interface.

Code to test:

  | @Name("action")
  | @Interceptors(SeamInterceptor.class)
  | public class Action implements IAction {
  |   @In(create = true)
  |   private FacesMessages facesMessages;
  | 
  |   public void addErrorMessage(String aMessageKey) {
  |    this.facesMessages.add(FacesMessage.SEVERITY_INFO, "${" + aMessageKey + 
"}");
  |   }
  | 
  |   protected void setFacesMessages(FacesMessage aFacesMessages) {
  |     this.facesMessages = aFacesMessages;
  |   }
  | 

Test code.

  | public class ActionUnitTest extends TestCase {
  | 
  |   private Action classUnderTest;
  |   private FacesMessages mockFacesMessages;
  | 
  |   public void testAddErrorMessage() {
  |       // Setup
  |      expect(this.mockFacesMessages.add("${test.key}"));
  |      replay(this.mockFacesMessages);
  | 
  |       // Execute test
  |       this.classUnderTest.addErrorMessage("test.key");
  | 
  |       // Verify
  |      verify(this.mockFacesMessages);
  |   }
  | 
  |   protected void setUp() throws Exception {
  |     this.mockFacesMessages = createMock(FacesMessages.class); // EXCEPTION 
Cause an exception because the class is not an interface
  |     this.classUnderTest = new Action();
  |     this.classUnderTest.setFacesMessages(this.mockEntityManager);
  |   }
  | }
  | 

Thanks,

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http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3929175#3929175

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http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3929175


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