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Demonstrates a way to create an JSF bean integration test

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package de.larmic.joinfaces.test;

import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;

import javax.faces.component.UIViewRoot;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

public class FacesContextMock {

    private Map parameterMap = new HashMap<>();

    private Map viewMap = new HashMap();

    public FacesContextMock withExternalParameter(String key, String value) {
        this.parameterMap.put(key, value);
        return this;
    }

    public FacesContextMock withExternalParameters(Map parameters) {
        this.parameterMap.putAll(parameters);
        return this;
    }

    public FacesContextMock replaceIn(ApplicationContext applicationContext) {
        final FacesContext facesContext;
        final ConfigurableListableBeanFactory beanFactory = ((ConfigurableApplicationContext) applicationContext).getBeanFactory();
        if (!beanFactory.containsBean("facesContext")) {
            facesContext = mock(FacesContext.class);
            beanFactory.registerSingleton("facesContext", facesContext);
        } else {
            facesContext = (FacesContext) beanFactory.getBean("facesContext");
        }
        final ExternalContext externalContext = mock(ExternalContext.class);
        final UIViewRoot uiViewRoot = mock(UIViewRoot.class);
        when(facesContext.getExternalContext()).thenReturn(externalContext);
        when(externalContext.getRequestParameterMap()).thenReturn(parameterMap);
        when(facesContext.getViewRoot()).thenReturn(uiViewRoot);
        when(uiViewRoot.getViewMap()).thenReturn(viewMap);
        final Field field;
        try {
            field = FacesContext.class.getDeclaredField("instance");
            field.setAccessible(true);
            final ThreadLocal threadLocal = (ThreadLocal) field.get(null);
            threadLocal.set(facesContext);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        return this;
    }
}