Your code expects classA to be a ClassB object, but it is not (unless ClassA extends ClassB, but then you wouldn't need the cast). Have you tried
ClassA mockedClassA = PowerMock.createMock(ClassB.class)
Question
I have a object which I mock using powermock while unit testing.
ClassA mockedClassA = PowerMock.createMock(ClassA.class);
Later in mycode I'm using that object with a cast. Life follows.
String hello = ((ClassB)classA).someMethod();
Junit test throws following exception at thie place.
java.lang.ClassCastException: $Proxy15 incompatible with ClassB
It looks like casting the mocked object is not possible. So how can I go through this?
I tried following thigs.
Easymock.expect((ClassB)mockedClassA.somemethod())...;
doesn't work.
Solution
Your code expects classA to be a ClassB object, but it is not (unless ClassA extends ClassB, but then you wouldn't need the cast). Have you tried
ClassA mockedClassA = PowerMock.createMock(ClassB.class)