How to mock HttpSession in JSF - unit-testing

Question

i have a service method that get session attribute and i want to make unit test for this service method and i was wondering how to mock the HttpSession in jsf.

Answer 1

1- use the FacesContextMocker class:
public abstract class FacesContextMocker extends FacesContext {
private FacesContextMocker() {}
private static final Release RELEASE = new Release();
private static class Release implements Answer<Void> {
#Override
public Void answer(InvocationOnMock invocation) throws Throwable {
setCurrentInstance(null);
return null;
}
}
public static FacesContext mockFacesContext() {
FacesContext context = Mockito.mock(FacesContext.class);
setCurrentInstance(context);
Mockito.doAnswer(RELEASE).when(context).release();
return context;
}
}
2- in the test class #Before method do the following:
FacesContextMocker.mockFacesContext();
ExternalContext externalContext = Mockito.mock(ExternalContext.class);
Mockito.when(FacesContext.getCurrentInstance().getExternalContext())
.thenReturn(externalContext);
HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
Mockito.when(
FacesContext.getCurrentInstance().getExternalContext()
.getRequest()).thenReturn(request);
HttpSession httpSession = Mockito.mock(HttpSession.class);
Mockito.when(GeneralUtils.getHttpSession()).thenReturn(httpSession);
3- the getHttpSession method is as follows:
public static HttpSession getHttpSession() {
return ((HttpServletRequest) FacesContext.getCurrentInstance()
.getExternalContext().getRequest()).getSession();
}
4- in the test method do the following:
Mockito.when(
GeneralUtils.getHttpSession().getAttribute(
"userID")).thenReturn("1");
5- this is assuming that in your service method that you are making the unit test for you have code like:
String currentUserID = (String) GeneralUtils.getHttpSession()
.getAttribute(userID);