RSpec：带有参数的存根链

如何在RSpec中使用带有参数的存根链

bash
gem install rspec

ruby
class Calculator
  def add(a, b)
    a + b
  end
  def multiply(a, b)
    a * b
  end
end

ruby
require 'calculator'
RSpec.describe Calculator do
  let(:calculator) { Calculator.new }
  describe '#add' do
    it 'returns the sum of two numbers' do
      allow(calculator).to receive(:add).with(3, 4).and_return(7)
      result = calculator.add(3, 4)
      expect(result).to eq(7)
    end
  end
  describe '#multiply' do
    it 'returns the product of two numbers' do
      allow(calculator).to receive(:multiply).with(2, 5).and_return(10)
      result = calculator.multiply(2, 5)
      expect(result).to eq(10)
    end
  end
end