Week2

week 2 mid-week code review
I did a bit more digging, instead of `response.body.to include`, probably I should do this: `expect(response).to has_selector('review_content', value: 'keep this!')`, but the testing result came back with `undefined method has_selector`, Google it, someone says it has something to do with `Capybara` or something, I believe our course will cover `Capybara` later, guess I'll wait then :) Thanks again.