Closing.

no issue you need to count all bears not only bears_pairs

There some not right random tests. For example some not right tests.

Testing for 6 and 'B8lB888B88Bii'
['B8B88B8B', False] should equal ['B8B88B8B', True]

I count pairs in right answer and theres only 4 pairs. But it returns True. I don't know my code is wrong or i misunderstood task.
More example. Sorry for my english if i wrote something wrong.

Testing for 6 and '8BBbBea8eB8BBf8b88B'
['8BB88B', False] should equal ['8BB88B', True] There is 3 pairs

Testing for 7 and 'Bb8BbgmBb8B8geB8BBaicii8B8'
['8B8BB88B', False] should equal ['8B8BB88B', True] There is 4 pairs

I think the some tests answer is not right.