存根采用 Class<T> 的方法作为 Mockito 的参数

问题描述

有一个将类作为参数的通用方法，我在使用 Mockito 存根时遇到问题.该方法如下所示:

There is a generic method that takes a class as parameter and I have problems stubbing it with Mockito. The method looks like this:

public <U extends Enum<U> & Error, T extends ServiceResponse<U>> T validate(
    Object target, Validator validator, Class<T> responseClass,
    Class<U> errorEnum);

这太糟糕了，至少对我来说……我可以想象没有它的生活，但是代码库的其余部分很乐意使用它……

It's god awful, at least to me... I could imagine living without it, but the rest of the code base happily uses it...

我打算在我的单元测试中存根这个方法以返回一个新的空对象.但是我如何用 mockito 做到这一点?我试过了:

I was going to, in my unit test, stub this method to return a new empty object. But how do I do this with mockito? I tried:

when(serviceValidatorStub.validate(
    any(),
    isA(UserCommentRequestValidator.class),
    UserCommentResponse.class,
    UserCommentError.class)
).thenReturn(new UserCommentResponse());

但由于我混合和匹配匹配器和原始值，我得到org.mockito.exceptions.misusing.InvalidUseOfMatchersException:参数匹配器的无效使用！"

but since I am mixing and matching matchers and raw values, I get "org.mockito.exceptions.misusing.InvalidUseOfMatchersException: Invalid use of argument matchers!"

推荐答案

问题是，你不能在模拟调用中混合参数匹配器和真实参数.所以，宁愿这样做:

The problem is, you cannot mix argument matchers and real arguments in a mocked call. So, rather do this:

when(serviceValidatorStub.validate(
    any(),
    isA(UserCommentRequestValidator.class),
    eq(UserCommentResponse.class),
    eq(UserCommentError.class))
).thenReturn(new UserCommentResponse());

注意使用 eq() 参数匹配器来匹配相等性.

Notice the use of the eq() argument matcher for matching equality.

参见:https://static.javadoc.io/org.mockito/mockito-core/1.10.19/org/mockito/Matchers.html#eq(T)

此外，您可以将 same() 参数匹配器用于 Class<?> 类型 - 这匹配相同的身份，例如 == Java 运算符.

Also, you could use the same() argument matcher for Class<?> types - this matches same identity, like the == Java operator.

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