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Comments on Mocking methods with arguments
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Mocking methods with arguments
Let's say I have this class I want to mock
class A {
public void add(T arg) {
B b = A.getB();
U val = somefunc(arg);
V ret = b.add(val);
}
}
I have a spy on A and a mock on B, but when A::foo calls B::bar, I want it to be mocked. But I want some stuff to be done inside it. Something like this:
class BMock {
List<U> ulist = new ArrayList<>();
R add(U u) {
if(ulist.contains(u)) throw exception;
}
return new R(x);
}
But I'm having a bit of a problem how to do this. I'm looking for something on this form:
A a = spy(A.class);
B b = mock(B.class);
a.b = b;
BMock bm = new BMock();
doAnswer(bm.add(arg)).when(b).add(any());
^ |
| |
------------------
What I want to do is to send the any argument over to bm.add
In the real code, B::add will contact a remote server to add an item. If it gets called twice with the same item, the server will return an error. A::add will analyze this return code and act accordingly. And this is what I'm trying to simulate. How should I do it?
EDIT
I got some suggestions in comment section. But I might add that I cannot change B because it's an external library, and the class B both misses default constructor and is final.
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