Rspec 输出格式：文档

ruby
# calculator_spec.rb
require 'calculator'
describe Calculator do
  it 'adds two numbers' do
    calculator = Calculator.new
    result = calculator.add(2, 3)
    expect(result).to eq(5)
  end
  it 'subtracts two numbers' do
    calculator = Calculator.new
    result = calculator.subtract(5, 3)
    expect(result).to eq(2)
  end
end

bash
rspec --format documentation

Calculator
  adds two numbers
    should return the sum of two numbers
  subtracts two numbers
    should return the difference of two numbers