spec_examples.rb

#http://eggsonbread.com/2010/03/28/my-rspec-best-practices-and-tips/
describe User do
  subject { user }
  let(:user) { User.new }

  context "when name empty" do
    it { should_not be_valid }
    specify { user.save.should be_false }
  end

  context "when name not empty" do
    let(:user) { User.new(:name => 'Sam') }

    it { should be_valid }
    specify { user.save.should be_true }
  end

  describe :present do
    subject { user.present }

    context "when user is a W" do
      let(:user) { User.new(:gender => 'W') }

      it { should be_a Flower }
    end

    context "when user is a M" do
      let(:user) { User.new(:gender => 'M') }

      it { should be_an IMac }
    end
  end
end