java如何模拟来自Faces上下文和外部上下文的请求？

Question

我有密码。java是这样的：

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

我也创建了FacesContextProvider类，这是我的FacesContextProvider。爪哇

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;
    }
    
}

这是我的测试。爪哇

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

当我运行测试时，MainBacking上出现了错误null。爪哇：请帮帮我。多谢各位

Answer 1

谢谢你的回复，我通过阅读this article解决了我的问题。当我使用FacesContextProvider时，我不知道出了什么问题。我仍然有空错误，但是当我使用Omnifaces将模拟的FacesContext设置为测试用例中的当前实例时，空错误得到了解决。谢谢大家!

Answer 2

看着其中的this answer和article linked，我无法重现NPE。 我就是这样测试的：

import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.servlet.http.*;

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

class MainBackingTest {

    MainBacking mainBackingUnderTest = new MainBacking();

    @Test
    void testInit() {
        // given
        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);

        // when
        try {
            mainBackingUnderTest.init();
        } finally {
            mockFacesContext.release();
        }

        // then
        verify(mockFacesContext, times(1)).getExternalContext();
        verify(mockExternalContext, times(1)).getRequest();
    }
}