将一个上下文中的spring bean替换为另一上下文中的模拟版本 [英] Replace spring bean in one context with mock version from another context

问题描述

我正在编写一个集成测试，其中在启动过程中初始化了应用程序上下文xml.测试类中有几种测试方法，它们利用特定的bean'X'(已在xml中定义).我的实际要求是仅针对其中一种测试方法来模拟beanX.

I'm writing an integration test where an application context xml is initialized during startup. There are several test methods in the test class which make use of a specific bean 'X'(already defined in the xml). My actual requirement is to mock bean X only for one of the test methods.

在一种测试方法中:我尝试使用仅带有模拟豆'M'的ClassPathXMLApplicationContext创建一个单独的应用程序上下文.

Inside a test method: I tried creating a separate application context using ClassPathXMLApplicationContext with only the mock bean 'M'.

现在我有两个应用程序上下文(AC): 1.在测试用例启动期间创建的一个(包含实际的bean X)，然后 2.一个在测试方法中使用ClassPathXMLApplicationContext创建的模型(具有模拟豆M).

Now I have two Application Contexts (AC): 1. One created during test case startup (which contains the actual bean X) and 2. One created using ClassPathXMLApplicationContext within the test method (which has the mock bean M).

我想使用AC:2中的模拟bean定义"M"替换AC:1中的实际bean定义"X".

I want to replaced the actual bean definition 'X' within AC:1, using the mock bean definition 'M' from AC:2.

有人可以对此有所启发吗?

Can somebody throw some light on this please?

推荐答案

没有明确的方法来替换刷新后的ApplicationContext中的bean，除非您将其关闭并再次刷新.

There is not a clear way to replace a a bean in a refreshed ApplicationContext unless you close it and refresh it again.

要模拟它，常见的方法是使用要替换的bean的Proxy并在运行时更改目标.

To emulate it, the common approach is to use a Proxy of the bean that you want to replace and change the target at runtime.

您可以使用框架aop支持类轻松完成此操作:

You can do it easily using the framework aop support classes:

<bean id="realBean" class="RealClass" />
<bean id="mockBean" class="MockClass" />
<bean id="targetSource" class="org.springframework.aop.target.HotSwappableTargetSource">
    <constructor-arg ref="realBean" />
</bean>

<bean id="bean" class="org.springframework.aop.framework.ProxyFactoryBean">
    <property name="targetSource" ref="targetSource" />
</bean>

 

@Test
public void testWithMockBean() {
Object real = targetSource.swap(mock);
....
// do your test work
...
targetSource.swap(real);

}

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