example_spec.rb

describe String do

  it "responds to #to_s" do
    expect("").to respond_to(:to_s)
  end

  it "responds to the correct methods" do
    [ :to_s, :to_i, :to_f ].each do |method|
      expect("").to respond_to(method)
    end
  end

  [ :to_s, :to_i, :to_f ].each do |method|
    it "responds to #{method}" do
      expect("").to respond_to(method)
    end
  end
  
  def required_methods
    [ :to_s, :to_i, :to_f ]
  end
  
  required_methods.each do |method|
    it "responds to #{method}" do
      expect("").to respond_to(method)
    end
  end
  
  # Or something that is a little more Rspec
  let(:methods_to_test) do
    [ :to_s, :to_i, :to_f ]
  end
  
  methods_to_test.each do |method|
    it "responds to #{method}" do
      expect("").to respond_to(method)
    end
  end
  
  

end