Mock BeanInfo class from Object using mockito

Question

Suppose I have the following method structure:

protected static void sub(Object obj, String filler) {

    class cls = obj.getClass();
    BeanInfo beanInfo = Introspector.getBeanInfo(cls);

    // Other code...
}

How do I mock the BeanInfo class given this structure?

Answer 1

Move this logic to separate method:

static BeanInfo beanInfo(Object obj) {
    Class cls = obj.getClass();
    BeanInfo beanInfo = Introspector.getBeanInfo(cls);
}

and then mock beanInfo method.

Answer 2

You should code with dependency injection in mind. Then you can pass the mock as a parameter in your test.

protected static void sub(BeanInfo beanInfo, String filler) {
    // code...
}