Shared Example Groups

下記のようにshared_examples_forで定義したexample groupは、it_should_behave_likeメソッドを使うことで、複数の箇所で使い回せる。controllerのテストを書くときなどに使えそう(modelでは使う場面はないような気がする？)

shared_examples_for "All Employees" do
  it "should be payable" do
    @employee.should respond_to(:calculate_pay)
  end
end

shared_examples_for "All Managers" do
  it_should_behave_like "All Employees"
  it "should be bonusable" do
    @employee.should respond_to(:apply_bonus)
  end
end

describe Officer do
  before(:each) do
    @employee = Officer.new
  end

  it_should_behave_like "All Managers"

  it "should be optionable" do
    @employee.should respond_to(:grant_options)
  end
end

$ spec officer_spec.rb

Officer
- should be payable
- should be bonusable
- should be optionable

参考

RSpec.info: RSpec
it_should_behave_like が割と便利 - milk1000cc