Problem with the scenario writing in Mockito

Question

I am writing the unit test for my class using JUnit and Mockito. For a particular test I have Mocked httpServletRequest object but instead of returning Hello it is throwing NullPointerException can anyone tell me how to write the scenario correctly.

HttpServletRequest httpServletRequest = mock(HttpServletRequest.class);

// Trying to fetch the Request Body     

when(httpServletRequest.getReader().lines().collect(Collectors.joining(System.lineSeparator()))).thenReturn
        ("Hello");

Answer 1

To mock a class I would use org.mockito.Mockito.mock()

HttpServletRequest httpServletRequest = org.mockito.Mockito.mock(HttpServletRequest.class);

then, use when for the scenario.

I hope to be helpful.

Answer 2

You are mocking HttpServletRequest. So httpServletRequest is not null, but httpServletRequest.getReader() is. Calling lines() then causes NPE.

Want do you actually want to achieve?