Thanks to Josh Nichols for pointing out that the original code (and the RSpec mock code!) did not handle stubbing the same part of the chain multiple times, for example:

stub_chain(:votes, :supporting, :count).returns(supporting_count)
stub_chain(:votes, :opposing, :count).returns(opposing_count)

Here is the updated snippet that works when you stub the same part of the chain multiple times:

 1 module StubChainMocha
 2   module Object
 3     def stub_chain(*methods)
 4       if methods.length > 1
 5         next_in_chain = ::Object.new
 6         stubs(methods.shift).returns(next_in_chain)
 7         next_in_chain.stub_chain(*methods)
 8       else
 9         stubs(methods.shift)
10       end
11     end
12   end
13 end
14 
15 Object.send(:include, StubChainMocha::Object)

Copy that into spec/stub_chain_mocha.rb and then require it from spec_helper.rb.