mock_model_outside_rails_spec.rb

require 'active_model'
require 'active_support/core_ext'
require 'rspec/rails/mocks'

describe "Foo" do
  it "is mockable" do
    foo = mock_model("Foo")
    foo.id.should eq(1001)
    foo.to_param.should eq("1001")
  end
end