mockito:通过反射使用参数模拟方法调用 [英] mockito : mock method call with parameters by reflection
问题描述
我正在使用 mockito 并使用 java6 和 spring 进行开发.
I'm using mockito and developping with java6 and spring.
我正在为一些开发人员开发一个测试 API，我提出了一些模拟对象和方法的方法(这是一个遗留代码......).现在，我想用 mockito 替换所有这些东西，但我总是提出一个测试 API.所以，我开发了一些使用 mockito 的方法.
I'm working on a test API for some developpers and I propose a few methods for mocking objects and methods (it's a legacy code...). Now, I want to replace all this things by mockito but I always propose a test API. So, I developped some methods using mockito.
我有一个带有两个参数(字符串)的旧方法.第一个参数是模拟的服务 ID 及其带参数的方法.第二个参数是返回的对象.示例:
I have an old method with two parameters (String). A first parameter is a mocked service id and its method with parameters. And the second parameter is the returned Object. Example :
mockReturnObject("myServiceId.myMethod(String, Integer)", myReturnedObject);
现在，我想用mock，when和then返回mockito方法，不知道怎么...也许使用反射但使用何时"方法是不可能的，因为 mockito 需要有效的方法.我怎样才能做到这一点 ?谢谢.
Now, I want to use mock, when and thenReturn mockito methods, and I don't see how... Perhaps with reflection but with "when" method it's impossible because mockito need the effective method. How can I do that ? thanks.
推荐答案
这是个坏主意:您试图重新实现 Mockito 已经提供的一些系统，同时失去了 Mockito 提供的许多功能.但是，有一种方法可以使这项工作发挥作用，但有一些困难.关键是要写一个 自定义答案，使其成为默认答案 用于模拟，然后使用 InvocationOnMock.
This is a bad idea: you're trying to reimplement some of the systems Mockito already provides while losing out on many of the features Mockito offers. However, there is a way to make this work, with some difficulty. The key is to write a custom Answer, make it the default answer for the mock, and then compare your object, method name, and method parameter types using InvocationOnMock.
public class ReflectiveMockAnswer implements Answer<Object> {
@Override public Object answer(InvocationOnMock invocation) {
// Assume you've successfully parsed each String into a StubbedResponse, with
// Object target, String method, String[] argTypes, and Object returnValue.
// A Set would beat a for-loop here, should you need to optimize.
for (StubbedResponse stubbedResponse : allStubbedResponses) {
if (stubbedResponse.target == invocation.getMock()
&& stubbedResponse.method.equals(invocation.getMethod().getName())
&& stringArraysEqual(stubbedResponse.argTypes,
typeNamesFrom(invocation.getMethod().getParameterTypes())) {
return stubbedResponse.returnValue;
}
}
throw new RuntimeException("Unstubbed method called.");
}
}
// Later...
Object yourMockObject = Mockito.mock(classToMock, new ReflectiveMockAnswer());
此时，您已经在 Mockito 的完整版内并基于实现了 Mockito 的简化版.您还需要:
At that point, you've implemented a simplified version of Mockito within and based on the full version of Mockito. You'll also need to:
- 将字符串解析为 StubbedResponse，可能使用正则表达式
- 按名称标识被测 bean 中的字段
- 在被测 bean 有机会与其交互之前，用上面创建的适当类的模拟替换该字段
...并承认此解决方案无法处理:
...and acknowledge that this solution doesn't handle:
- 验证
- 任何类型的参数匹配，包括基本的等于"匹配
- 参数类型中的名称冲突(com.foo.SomeClass 与 com.bar.SomeClass)
- 重复调用 (
thenReturn(1, 2, 3).thenThrow(new RuntimeException()))
...并且不能处理:
- 代码搜索工具:您只能通过搜索字符串来判断哪些方法被模拟，而不能使用诸如查找引用"之类的工具.在 Eclipse 中使用 Mockito 的方式
- 编译时检查和自动重构工具:如果字段名称、方法名称或参数发生变化，您的测试将在运行时中断；Mockito 没有这个问题
- 最终方法:Mockito 不能，所以你也不能
除非这是一个稻草人"；或者非常临时的解决方案，我强烈建议将 Mockito 直接引入您的测试用例，一次一个测试.
Unless this is a "straw man" or very temporary solution, I recommend strongly to just introduce Mockito directly into your test cases, one test at a time.
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