gistfile1.rb

class User
  def full_name
    "%{first_name} %{last_name}"
  end
end

describe User
  describe "#full_name" do
    it "should be the merge of first and last name"
      subject.stub(:first_name).and_return("Marcelo")
      subject.stub(:last_name).and_return("Cajueiro")
      
      subject.full_name.should eq("Marcelo Cajueiro")
    end
  end
end