Spring Framework TEST RESTful Web Service (Controller) Offline i.e. No Server, No Database

Here is one suggestion that should give you some ideas. I assume that you are familiar with the SpringJUnit4ClassRunner and the @ContextConfiguration. Start by creating an test application context that contains PcUserController and a mocked PcUserService. In the example PcUserControllerTest class below, Jackson is used to convert JSON messages and Mockito is used for mocking.

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(/* Insert test application context here */)
public class PcUserControllerTest {

    MockHttpServletRequest requestMock;
    MockHttpServletResponse responseMock;
    AnnotationMethodHandlerAdapter handlerAdapter;
    ObjectMapper mapper;
    PcUser pcUser;

    @Autowired
    PcUserController pcUserController;

    @Autowired
    PcUserService pcUserServiceMock;

    @Before
    public void setUp() {
        requestMock = new MockHttpServletRequest();
        requestMock.setContentType(MediaType.APPLICATION_JSON_VALUE);
        requestMock.addHeader(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE);

        responseMock = new MockHttpServletResponse();

        handlerAdapter = new AnnotationMethodHandlerAdapter();
        HttpMessageConverter[] messageConverters = {new MappingJacksonHttpMessageConverter()};
        handlerAdapter.setMessageConverters(messageConverters);

        mapper = new ObjectMapper();
        pcUser = new PcUser(...);

        reset(pcUserServiceMock);
    }
}

Now, we have all the code needed to create the tests:

@Test
public void shouldGetUser() throws Exception {
    requestMock.setMethod("GET");
    requestMock.setRequestURI("/pcusers/1");

    when(pcUserServiceMock.read(1)).thenReturn(pcUser);

    handlerAdapter.handle(requestMock, responseMock, pcUserController);

    assertThat(responseMock.getStatus(), is(HttpStatus.SC_OK));
    PcUser actualPcUser = mapper.readValue(responseMock.getContentAsString(), PcUser.class);
    assertThat(actualPcUser, is(pcUser));
}


@Test
public void shouldCreateUser() throws Exception {
    requestMock.setMethod("POST");
    requestMock.setRequestURI("/pcusers/create/1");
    String jsonPcUser = mapper.writeValueAsString(pcUser);
    requestMock.setContent(jsonPcUser.getBytes());

    handlerAdapter.handle(requestMock, responseMock, pcUserController);

    verify(pcUserServiceMock).create(pcUser);
}