Unit testing a method dependent to the request context

I'm writing a unit test for a method that contains the following line:

String sessionId = RequestContextHolder.currentRequestAttributes().getSessionId();

I get the following error:

java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.

The reason is quite obvious — I'm not running the test in a request context.

The question is, how can I test a method that contains a call to a method dependent to the request context in a test environnment?

Thank you very much.

Solution 1:

Spring-test has a flexible request mock called MockHttpServletRequest.

MockHttpServletRequest request = new MockHttpServletRequest();
RequestContextHolder.setRequestAttributes(new ServletRequestAttributes(request));

Solution 2:

You can mock/stub the RequestAttributes object to return what you want, and then call RequestContextHolder.setRequestAttributes(RequestAttributes) with your mock/stub before you start your test.

@Mock
private RequestAttributes attrs;

@Before
public void before() {
    MockitoAnnotations.initMocks(this);
    RequestContextHolder.setRequestAttributes(attrs);

    // do you when's on attrs
}

@Test
public void testIt() {
    // do your test...
}