require 'rails_helper' describe Animal, :type => :model do it { is_expected.to be_versioned } describe "STI", :versioning => true do it { expect(Animal.inheritance_column).to eq('species') } describe "updates to the `inheritance_column`" do subject { Cat.create!(:name => 'Leo') } it "should be allowed" do subject.update_attributes(:name => 'Spike', :species => 'Dog') dog = Animal.find(subject.id) expect(dog).to be_instance_of(Dog) end end end end