Mock polymorphic associations with Mocha

mock_polymorphic.rb

def mock_polymorphic
  mock().tap do |p|
    p.expects(:class).returns(p).at_least_once
    p.expects(:base_class).returns(p).at_least_once
    p.expects(:name).returns('Mock').at_least_once
    p.expects(:id).returns((rand * 10e5).round).at_least_once
    p.expects(:blank?).returns(false).at_least_once
    p.expects(:destroyed?).returns(false).at_least_once
    p.expects(:new_record?).returns(false).at_least_once
  end
end