```ruby
# TO RUN THIS:
#   $ rspec calculator_spec.rb
# YOU MAY NEED TO:
#   $ gem install rspec  # (and get v 2.14 or higher)

require_relative 'calculator'

describe Calculator do
  let(:calculator) { Calculator.new }

  describe "addition" do
    it "puts two and two together" do
      expect( calculator.add(2, 2) ).to eq(4)
    end
  end

  # IF YOU'RE BORED...
  describe "parsing for fun and profit" do
    it "does simple addition" do
      expect( calculator.evaluate("2+2") ).to eq(4)
    end

    it "copes well with spaces" do
      expect( calculator.evaluate("  2    + 2") ).to eq(4)
    end

    it "understands order of operations" do
      expect( calculator.evaluate("2+2*5") ).to eq(12)
    end
  end
end
```

Mark "bored" specs as pending for now
user
```ruby
# TO RUN THIS:
#   $ rspec calculator_spec.rb
# YOU MAY NEED TO:
#   $ gem install rspec  # (and get v 2.14 or higher)

require_relative 'calculator'

describe Calculator do
  let(:calculator) { Calculator.new }

  describe "addition" do
    it "puts two and two together" do
      expect( calculator.add(2, 2) ).to eq(4)
    end
  end

  # IF YOU'RE BORED...
  describe "parsing for fun and profit", pending: true do
    it "does simple addition" do
      expect( calculator.evaluate("2+2") ).to eq(4)
    end

    it "copes well with spaces" do
      expect( calculator.evaluate("  2    + 2") ).to eq(4)
    end

    it "understands order of operations" do
      expect( calculator.evaluate("2+2*5") ).to eq(12)
    end
  end
end
```
assistant