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Q&A 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 o...

3 answers · posted 2y ago by klutt‭ · last activity 2y ago by klutt‭

Question java mocking junit mockito

#3: Post edited by

Alexei‭ · 2022-02-25T15:50:12Z (over 2 years ago)
added relevant tag

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java junit mockito

java mocking junit mockito

#2: Post edited by

klutt‭ · 2022-02-25T14:47:28Z (over 2 years ago)

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Let's say I have this class I want to mock
class A {
~~protected B b;~~
public void add(T arg) {
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?

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.

#1: Initial revision by

klutt‭ · 2022-02-25T11:35:04Z (over 2 years ago)

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Mocking methods with arguments

Let's say I have this class I want to mock

    class A {
        protected B b;

        public void add(T arg) {
            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?

java junit mockito

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