如何测试Google Guava谓词工厂类的类

Question

I have a class called XxxPredicateFactory which return a single predicate or predicate combination. Something like this:

Public class XxxPredicateFactory {

     public Predicate<Abc> create() {
          if (this) {
              return new HelloPredicate<Abc>();
          }
          else if (that) {
              return new WorldPredicate<Abc>();
          }
          else {
               return Predicates.or(new HelloPredicate<Abc>(), new WorldPredicate<Abc>());
          }
     }

}

For the if and else if, it seems easy to test, but for the else part I am not quite sure how can I test this? How can I capture this situation?

Answer 1

你能不只是测试返回的谓词返回true两种东西， HelloPredicate应该返回true的和事WorldPredicate应返回true的呢？