Update to RSpec 2.99.
Fix this method to return a boolean.
Convert specs to the latest RSpec syntax with Transpec

This conversion is done by Transpec 1.3.1 with the following command:
    transpec -m --keep stub -b true,false

* 46 conversions
    from: be_true
      to: be true

* 34 conversions
    from: be_false
      to: be false

* 4 conversions
    from: expect(collection).to have(n).items
      to: expect(collection.size).to eq(n)

* 4 conversions
    from: its(:attr) { }
      to: describe 'attr' do subject { super().attr }; it { } end

* 3 conversions
    from: expect(obj).to have(n).previously_recorded_interactions
      to: expect(obj.send(:previously_recorded_interactions).size).to eq(n)
These predicates return truthy, not boolean values.
Fix another RSpec warning.
Update to RSpec 3.

Fuubar RSpec dependency is pinned to RSpec 2.x,
so we can't install it yet.