[FIXED] Java Unit Test Mock HttpServletRequest getResourceAsStream

Issue

How to mock HttpServletRequest getResourceAsStream in a Java unit test? I am using it to read a resource file from a servlet request.

HttpServletRequest.getSession().getServletContext().getResourceAsStream()

I am using org.mockito.Mock to Mock HttpServletRequest.

Solution

There is quite a bit of mocking you need to do. I would suggest using annotations:

import static org.mockito.Mockito.when;

public class TestClass{

   @Mock
   private HttpServletRequest httpServletRequestMock;

   @Mock
   private HttpSession httpsSessionMock;

   @Mock
   private ServletContext servletContextMock;

   @Before
   public void init(){
      MockitoAnnotations.initMocks(this);
   }

   @Test
   public void test(){
       // Arrange
       when(httpServletRequestMock.getSession()).thenReturn(httpSessionMock);
       when(httpSessionMock.getServletContext()).thenReturn(servletContextMock);

       InputStream inputStream = // instantiate;

       when(servletContextMock.getResourceAsStream()).thenReturn(inputStream);

       // Act - invoke method under test with mocked HttpServletRequest

   }
}

Answered By - Maciej Kowalski