JUnit for both try and catch block coverage

Question

I am trying to write a JUnit for below code but I am not getting any idea how to cover the code which is written in catch block statement. Please can any one write a sample JUni

Answer 1

Mockito, or another mocking framework can be used. You will need two test cases - with and without the exception being thrown. You can mock your DAOs to return a known object so you verify your service is exhibiting the correct behaviour.

I've written a full example below.

public class MocksExample {

    private ProductService service;
    @Mock
    private ProductDao productDao;
    @Mock
    private ProductCacheDao productCacheDao;
    @Mock
    private Product product;

    @Before
    public void setup() {
        MockitoAnnotations.initMocks(this);
        service = new ProductService();
        service.setProductCacheDao(productCacheDao);
        service.setProductDao(productDao);
    }

    @Test
    public void serviceReturnsProduct() {
        when(productCacheDao.getProductLookUpData()).thenReturn(product);
        assertThat(service.getProductLookUpData(), is(product));
    }

    @Test
    public void ipacProductReturnedWhenDaoThrowsException() {
        when(productDao.getIpacMetricCodeLookUpData()).thenReturn(product);
        when(productCacheDao.getProductLookUpData()).thenThrow(new IllegalStateException("foo"));
        assertThat(service.getProductLookUpData(), is(product));
    }
}