Mocking an object under observation

Question

I am seeing an exception when mocking an object that is already under KVO observation. Here is a simplified example that shows the problem:

[sourceObject addObserver:destinationObject forKeyPath:@"stringProperty" options:NSKeyValueObservingOptionNew context:nil];
[OCMockObject partialMockForObject:sourceObject];
[sourceObject removeObserver:destinationObject forKeyPath:@"stringProperty"];

When calling "-removeObserver:forKeyPath:" I get an exception that I am not currently observing the object. If I call "-stopMocking" on the mock before calling "-removeObserver:forKeyPath:" everything works fine.

score 0 · Accepted Answer · answered Oct 21 '13 at 18:10

Both OCMock and KVO dynamically subclass the object and they so they can't work properly together. The only real solution is to modify your tests in such a way to not have to mock the object under observation. Worst case you will have to create your own test subclass to be used while testing.

Mocking an object under observation

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