Mocking FacesContext

Question

I am trying to add some unit tests to a JSF application. This application didnt rely heavily on any best practices, so many service methods use the FacesContext to

Answer 1

Here's another way to use Mockito and reflection to mock FacesContext and to make sure normal calls to FacesContext.getCurrentInstance() returns the (mocked) instance you want:

@Before
public void setUp() {

    // Use Mockito to make our Mocked FacesContext look more like a real one
    // while making it returns other Mocked objects
    ExternalContext externalContext = Mockito.mock(ExternalContext.class);
    Flash flash = Mockito.mock(Flash.class);
    FacesContext facesContext = Mockito.mock(FacesContext.class);
    Mockito.when(facesContext.getExternalContext()).thenReturn(externalContext);
    Mockito.when(externalContext.getFlash()).thenReturn(flash);

    // Use Java reflection to set the FacesContext to our Mock, since
    // FacesContext.setCurrentInstance() is protected.
    try {
        Method setter = FacesContext.class.getDeclaredMethod("setCurrentInstance", new Class[]{FacesContext.class});
        setter.setAccessible(true);
        setter.invoke(null, new Object[]{facesContext});
    } catch (Exception e) {
        System.err.println("Exception in reflection-based access to FacesContext");
        e.printStackTrace();
    }
}

(This is adapted / extended from @McDowell's answer below.)