@Test public void testdeleteArticle() { String url = "test.at"; int id = 5; Article ar = new Article(); ar.setUrl(url); ar.setId(id); EntityManager mockEm = createMock(EntityManager.class); expect(mockEm.find(Article.class, ar.getId())).andReturn(ar); mockEm.remove(ar); replay(mockEm); ArticleDao aDAO = new ArticleDao(); aDAO.setEntityManager(mockEm); // Test aDAO.deleteArticle(ar.getId()); // Verify verify(mockEm); }