Mockito 参数匹配器，匹配具有泛型的任何类型，不包括空值

Question

Lets say I've got a class like this

public class Wrapper<T> {
    T data;
}

And I have a method call like this:

public interface ThingDoer {
     <T> boolean doSomething(Wrapper<T> wrapper)
}

which I want to mock out in a test. Lets say we're all set up with the mockito stuff, and now I'm trying to mock out this method call

when(thingDoer.doSomething(any(Wrapper.class))).thenReturn(true);

However, this will give me a warning: Unchecked assignment: 'package.Wrapper' to 'package.Wrapper<T>'

I read another suggestion somewhere that with Java 8, you're supposed to use any() instead of any(Wrapper.class) . However, reading through the documentation on these two methods, any() will accept null arguments and any(Class) will reject null arguments, so they are not quite synonymous. Is there a way to exclude nulls without getting a warning?

Answer 1

使用isNotNull()作为匹配器。

when(thingDoer.doSomething(isNotNull())).thenReturn(true);