使用 Mockito 模拟具有泛型参数的类 [英] Using Mockito to mock classes with generic parameters

问题描述

是否有一种干净的方法来模拟带有泛型参数的类?假设我必须模拟一个 Foo 类，我需要将它传递给一个需要 Foo 的方法.我可以很容易地做到以下几点:

Is there a clean method of mocking a class with generic parameters? Say I have to mock a class Foo<T> which I need to pass into a method that expects a Foo<Bar>. I can do the following easily enough:

Foo mockFoo = mock(Foo.class);
when(mockFoo.getValue).thenReturn(new Bar());

假设 getValue() 返回泛型类型 T.但是，当我稍后将它传递给一个期望 Foo 的方法时，它将会有小猫.铸造是这样做的唯一方法吗?

Assuming getValue() returns the generic type T. But that's going to have kittens when I later pass it into a method expecting Foo<Bar>. Is casting the only means of doing this?

推荐答案

我认为你确实需要投射它，但应该不会太糟糕:

I think you do need to cast it, but it shouldn't be too bad:

Foo<Bar> mockFoo = (Foo<Bar>) mock(Foo.class);
when(mockFoo.getValue()).thenReturn(new Bar());

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