Java SpringWebFlow：为JUnit测试设置请求参数 介绍

我有一个Java/Tomcat/Spring2.5/SpringWebFlow2.0.9Web应用程序。为了测试一些页面，我创建了JUnit测试，它为表单对象设置值并模拟来自浏览器的请求。JUnit测试类如下所示：

@TestExecutionListeners({ DependencyInjectionTestExecutionListener.class })
@ContextConfiguration(locations = { "classpath:/WebTests-context.xml", "classpath:/messageSourceConfig.xml" })
@RunWith(SpringJUnit4ClassRunner.class)

public class InitechValidatorTests {

    protected MockHttpSession session;
    protected MockHttpServletRequest request;

    //test methods omitted

    protected void startSession() {
        session = new MockHttpSession();
    }

    protected void endSession() {
        session.clearAttributes();
        session = null;
    }

    protected void startRequest() {
        request = new MockHttpServletRequest();
        request.setSession(session);
        RequestContextHolder.setRequestAttributes(new ServletRequestAttributes(request));

        MockRequestContext mrc = new MockRequestContext();
        org.springframework.webflow.execution.RequestContextHolder.setRequestContext(mrc);

        MessageContext messageContext = org.springframework.webflow.execution.RequestContextHolder.getRequestContext()
                .getMessageContext();
        this.validationContext.setMessageContext(messageContext);
    }

    protected void endRequest() {
        ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).requestCompleted();
        RequestContextHolder.resetRequestAttributes();
        request = null;

        org.springframework.webflow.execution.RequestContextHolder.setRequestContext(null);
    }
}

RequestContext requestContext = RequestContextHolder.getRequestContext();
ExternalContext externalContext = requestContext.getExternalContext();
String printPressed = externalContext.getRequestParameterMap().get("printPressed");

org.springframework.webflow.execution.RequestContext requestContext = org.springframework.webflow.execution.RequestContextHolder
                    .getRequestContext();
ExternalContext externalContext = requestContext.getExternalContext();
Map requestParamMap = externalContext.getRequestParameterMap().asMap();
requestParamMap.put("printPressed", "true");

对于每个测试方法，我调用startRequest和endRequest方法（在第一个测试方法之前调用startSession，在最后一个测试方法之后调用endSession）。如果没有这个构造，我无法在我正在测试的代码中使用例如RequestContextHolder

问题 在要测试的类中，我从web流中读取请求参数的内容，如下所示：

@TestExecutionListeners({ DependencyInjectionTestExecutionListener.class })
@ContextConfiguration(locations = { "classpath:/WebTests-context.xml", "classpath:/messageSourceConfig.xml" })
@RunWith(SpringJUnit4ClassRunner.class)

public class InitechValidatorTests {

    protected MockHttpSession session;
    protected MockHttpServletRequest request;

    //test methods omitted

    protected void startSession() {
        session = new MockHttpSession();
    }

    protected void endSession() {
        session.clearAttributes();
        session = null;
    }

    protected void startRequest() {
        request = new MockHttpServletRequest();
        request.setSession(session);
        RequestContextHolder.setRequestAttributes(new ServletRequestAttributes(request));

        MockRequestContext mrc = new MockRequestContext();
        org.springframework.webflow.execution.RequestContextHolder.setRequestContext(mrc);

        MessageContext messageContext = org.springframework.webflow.execution.RequestContextHolder.getRequestContext()
                .getMessageContext();
        this.validationContext.setMessageContext(messageContext);
    }

    protected void endRequest() {
        ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).requestCompleted();
        RequestContextHolder.resetRequestAttributes();
        request = null;

        org.springframework.webflow.execution.RequestContextHolder.setRequestContext(null);
    }
}

RequestContext requestContext = RequestContextHolder.getRequestContext();
ExternalContext externalContext = requestContext.getExternalContext();
String printPressed = externalContext.getRequestParameterMap().get("printPressed");

org.springframework.webflow.execution.RequestContext requestContext = org.springframework.webflow.execution.RequestContextHolder
                    .getRequestContext();
ExternalContext externalContext = requestContext.getExternalContext();
Map requestParamMap = externalContext.getRequestParameterMap().asMap();
requestParamMap.put("printPressed", "true");

我需要在JUnit测试方法中设置“printPressed”请求参数，如下所示：

@TestExecutionListeners({ DependencyInjectionTestExecutionListener.class })
@ContextConfiguration(locations = { "classpath:/WebTests-context.xml", "classpath:/messageSourceConfig.xml" })
@RunWith(SpringJUnit4ClassRunner.class)

public class InitechValidatorTests {

    protected MockHttpSession session;
    protected MockHttpServletRequest request;

    //test methods omitted

    protected void startSession() {
        session = new MockHttpSession();
    }

    protected void endSession() {
        session.clearAttributes();
        session = null;
    }

    protected void startRequest() {
        request = new MockHttpServletRequest();
        request.setSession(session);
        RequestContextHolder.setRequestAttributes(new ServletRequestAttributes(request));

        MockRequestContext mrc = new MockRequestContext();
        org.springframework.webflow.execution.RequestContextHolder.setRequestContext(mrc);

        MessageContext messageContext = org.springframework.webflow.execution.RequestContextHolder.getRequestContext()
                .getMessageContext();
        this.validationContext.setMessageContext(messageContext);
    }

    protected void endRequest() {
        ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).requestCompleted();
        RequestContextHolder.resetRequestAttributes();
        request = null;

        org.springframework.webflow.execution.RequestContextHolder.setRequestContext(null);
    }
}

RequestContext requestContext = RequestContextHolder.getRequestContext();
ExternalContext externalContext = requestContext.getExternalContext();
String printPressed = externalContext.getRequestParameterMap().get("printPressed");

org.springframework.webflow.execution.RequestContext requestContext = org.springframework.webflow.execution.RequestContextHolder
                    .getRequestContext();
ExternalContext externalContext = requestContext.getExternalContext();
Map requestParamMap = externalContext.getRequestParameterMap().asMap();
requestParamMap.put("printPressed", "true");

然而，这是不可能的，因为映射是不可变的，并且会导致不支持的操作异常

问题是：如何将请求参数设置为类中的requestParameterMap？返回的参数映射是不可变的，因此我无法在其中添加参数。我注意到，例如，有一个对象，听起来很有希望：“一个参数映射的扩展，允许参数的变异。作为测试的存根很有用。”

---

如何将MockParameterMap注入测试类中的ExternalContext？或者是否有其他方法来设置单元测试的请求参数？

通过修改startRequest方法来解决问题，以便我将设置为一个新对象，该对象设置如下：

MockParameterMap mpp = new MockParameterMap();
MockExternalContext mec = new MockExternalContext(mpp);
mrc.setExternalContext(mec);

org.springframework.webflow.execution.RequestContext requestContext = org.springframework.webflow.execution.RequestContextHolder
                    .getRequestContext();
ExternalContext externalContext = requestContext.getExternalContext();
MockParameterMap requestParameterMap = (MockParameterMap) externalContext.getRequestParameterMap();
requestParameterMap.put("printPressed", "true");

然后在JUnit测试方法中，我可以设置以下参数：

MockParameterMap mpp = new MockParameterMap();
MockExternalContext mec = new MockExternalContext(mpp);
mrc.setExternalContext(mec);

org.springframework.webflow.execution.RequestContext requestContext = org.springframework.webflow.execution.RequestContextHolder
                    .getRequestContext();
ExternalContext externalContext = requestContext.getExternalContext();
MockParameterMap requestParameterMap = (MockParameterMap) externalContext.getRequestParameterMap();
requestParameterMap.put("printPressed", "true");