存根返回多个值的方法rspec

# app/services/data_service.rb
class DataService
  def fetch_data(param)
    # 实际实现会调用外部服务
    ExternalService.fetch(param)
  end
end

# spec/services/data_service_spec.rb
require 'rails_helper'

RSpec.describe DataService, type: :service do
  describe '#fetch_data' do
    let(:data_service) { DataService.new }

    before do
      allow(ExternalService).to receive(:fetch)
    end

    it 'returns expected data for valid param' do
      allow(ExternalService).to receive(:fetch).with('valid_param').and_return({ status: 'success', data: [1, 2, 3] })
      result = data_service.fetch_data('valid_param')
      expect(result).to eq({ status: 'success', data: [1, 2, 3] })
    end

    it 'returns error for invalid param' do
      allow(ExternalService).to receive(:fetch).with('invalid_param').and_return({ status: 'error', message: 'Invalid parameter' })
      result = data_service.fetch_data('invalid_param')
      expect(result).to eq({ status: 'error', message: 'Invalid parameter' })
    end
  end
end

allow(ExternalService).to receive(:fetch).with('valid_param').and_return({ status: 'success', data: [1, 2, 3] })