unstub fails with subclasses

[jreeves]

If you unstub a parent class and then a child class, the child class will be given methods from the parent. e.g.

irb> require 'rspec'
irb> RSpec::Mocks::setup(Object.new)
irb> class Foo; end
irb> class Bar < Foo; end
irb> Foo.stub(:new)
irb> Bar.stub(:new)
irb> Foo.unstub(:new)
irb> Bar.unstub(:new)
irb> Bar.new
=> #<Foo:0x101ec4cd8>

[aakashd]

I have written a spec which verifies the issue and explains my understanding of how the API should behave. Please verify if it's correct. I will start working on the issue.

[aakashd]

Also, if I change the sequence of stubbing, it works perfectly fine.

Child.stub(:new)
Parent.stub(:new)
Child.unstub(:new)
Parent.unstub(:new)
Child.new.should be_an_instance_of Child

I don't yet know exactly what it means, but it's a start.

[jreeves]

That spec looks like it'll correctly test the issue.

[alindeman]

I believe this was inadvertently fixed by a727464. I've added the spec from @aakashd to prevent its regression.

Thanks for the report and spec.