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unsubscribe from events

0 votes
Hello,
I want to write unit test for a function whose only duty is to unsubscribe from events. I tried to use ExpectRemoveEvent function but I have gotten exceptions. The situation is I have "ClassA" that creates "ClassB" instance in the constructor (not takes "ClassB" instance as a parameter) and subscribes to "ClassB" events in the constructor ; and in function "Fct" I unsubscribe from "ClassB" events. I tried to use MockAll or Mock for ClassB in my test function, but it didn't work. Could you tell me waht to do?
Thanx.
asked by mkg
Report User
 (4.3k points)

2 Answers

0 votes
Hi,

You can do that using the Arrange Act Assert private API:
When you create an event the compiler generate two private methods that are called when you use the operators += and -=
"add_YourEventName" and "remove_YourEventName" you can do the verification on those methods like in the example below: 

[Test, Isolated]
public void Test()
{
    var fake = Isolate.Fake.Instance<ClassB>();
    Isolate.Swap.NextInstance<ClassB>().With(fake);

    ClassA consumer = new ClassA();
    consumer.Unsubscribe();
    Isolate.Verify.NonPublic.WasCalled(fake, "remove_SomeEvent");
}


Please let me know if it helps.
answered by ohad
Report User
 (35.4k points)
0 votes
yes, that worked.
Thanx
answered by mkg
Report User
 (4.3k points)
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