wishful_spec.rb

describe Person do
  subject(:person) { Person.new(age: age) }
  describe "minor?" do
    context "over 18" do
      let(:age) { 20 }
      it { person.minor?.should == false }
    end
    context "under 18" do
      let(:age) { 16 }
      it { person.minor?.should == true }
    end
    context "exactly 18" do
      let(:age) { 18 }
      it { person.minor?.should == true }.because(
        "Some obscure law in our client's district that requires treating 18 year olds as minors", 
         see: "http://jira.foo.com/SS-123245")
    end  
  end
end