module RSpec::Core::Subject::ClassMethods

end
its("phone_numbers.first") { should == "555-1212" }

end
person.phone_numbers << "555-1212"
person = Person.new
let(:person) do
describe Person

onto the subject in an expression.
with dots, the result is as though you concatenated that +String+
The attribute can be a +Symbol+ or a +String+. Given a +String+

end
end
end
subject.size.should == 0
it "should == 0" do
describe "size" do
describe Array do
# ... generates the same runtime structure as this:

end
its(:size) { should == 0 }
describe Array do
# This ...

and then generates an example using the submitted block.
Creates a nested example group named by the submitted +attribute+,

def its(attribute, &block)
  describe(attribute) do
    example do
      self.class.class_eval do
        define_method(:subject) do
          attribute.to_s.split('.').inject(super()) do |target, method|
            target.send(method)
          end
        end
      end
      instance_eval(&block)
    end
  end
end