Mock FacesContext to test my faces message displayer class

Question

My Backing bean:

@ManagedBean(name = "messageDisplayer")
@ViewScoped
public class MessageDisplayer implements Serializable
{
    private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());
    
    public void showMessage (FacesMessage.Severity severity, String summary, String detail)
    {
        FacesContext context = FacesContext.getCurrentInstance();
        LOGGER.debug("Showing message with severity='{}', summary='{}', detail='{}'", severity, summary, detail);
        context.addMessage(null, new FacesMessage(severity, summary, detail));
    }
}

Any help on how I can use Mockito to test this class!?

Check this http://illegalargumentexception.blogspot.co.uk/2011/12/jsf-mocking-facescontext-for-unit-ests.html#mockFacesCurrentInstance or http://stackoverflow.com/questions/4252353/mocking-facescontext — kaos, Oct 29 '14 at 14:22

score 2 · Answer 1 · edited Apr 24 '23 at 09:04

Use PowerMock to extend Mockito so you are able to mock the static methods of FacesContext.

If you are using Maven, use following link to check the needed dependency setup.

Annotate your JUnit test class using these two annotations. The first annotation tells JUnit to run the test using PowerMockRunner. The second annotation tells PowerMock to prepare to mock the FacesContext class.

@RunWith(PowerMockRunner.class)
@PrepareForTest({ FacesContext.class })
public class PageBeanTest {

Mock FacesContext using PowerMock. Use the Mockito verify() method to make sure the addMessage() method was called. Use an ArgumentCaptor in order to retrieve the FacesMessage that was passed to the addMessage() method call on the FacesContext. Then run assertEquals() to check if the correct values where set to the FacesMessage.

@Test
public void test() {
    // mock all static methods of FacesContext
    PowerMockito.mockStatic(FacesContext.class);

    FacesContext facesContext = mock(FacesContext.class);
    when(FacesContext.getCurrentInstance()).thenReturn(facesContext);

    MessageDisplayer messageDisplayer = new MessageDisplayer();
    messageDisplayer.showMessage(FacesMessage.SEVERITY_INFO, "summary", "detail");

    // create an ArgumentCaptor for the FacesMessage that will be added to
    // the FacesContext
    ArgumentCaptor<FacesMessage> facesMessageCaptor = ArgumentCaptor
            .forClass(FacesMessage.class);
    // verify if the call to addMessage() was made and capture the
    // FacesMessage that was passed
    verify(facesContext).addMessage(Mockito.anyString(),
            facesMessageCaptor.capture());

    // get the captured FacesMessage and check the set values
    FacesMessage message = facesMessageCaptor.getValue();
    assertEquals(FacesMessage.SEVERITY_INFO, message.getSeverity());
    assertEquals("summary", message.getSummary());
    assertEquals("detail", message.getDetail());
}

I've created a blog post which explains the above code sample in more detail.

Nice post and blog article, +1. – MWiesner Dec 01 '17 at 20:19 — MWiesner, Dec 01 '17 at 20:19

score 0 · Answer 2 · answered Oct 29 '14 at 14:12

0

You should use PowerMock to mock static methods. Here is an example of how to use it: https://code.google.com/p/powermock/wiki/MockStatic

answered Oct 29 '14 at 14:12

execc

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Mock FacesContext to test my faces message displayer class

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