How to Mocking Request from Faces Context External Context?

I have code on MainBacking.java like this :

public void init() {
    // Blah... 
    ExternalContext context = FacesContext.getCurrentInstance().getExternalContext(); // line 10
    HttpServletRequest request = (HttpServletRequest) context.getRequest(); // line 11
    // Blah...
}

I made FacesContextProvider class too and here is my FacesContextProvider.java

public abstract class FacesContextProvider extends FacesContext {

    private FacesContextProvider() {
    }

    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 getCurrentInstance() {
        FacesContext context = Mockito.mock(FacesContext.class);
        setCurrentInstance(context);
        Mockito.doAnswer(RELEASE).when(context).release();
        return context;
    }
    
}

And here is my test.java

FacesContext mockFacesContext = FacesContextProvider.getCurrentInstance();
HttpServletRequest mockRequest = Mockito.mock(HttpServletRequest.class);
ExternalContext mockExternalContext = Mockito.mock(ExternalContext.class);

when(mockFacesContext.getExternalContext()).thenReturn(mockExternalContext);
when(mockExternalContext.getRequest()).thenReturn(mockRequest);

// Run Test
mainBackingUnderTest.init(); // has been declare at top using @InjectMocks

When I run the test i got error null on MainBacking.java:11 Please help me. Thank You.

Answer

Thank You for all response, I’ve solved my problem by reading this article. I didn’t know whats wrong when I’m using FacesContextProvider I’m still got null error, but when I’m using Omnifaces to set the mocked FacesContext as current instance in my test-case, the null error was solved. Thank You!