ruby-on-rails - Rspec 模拟服务并接收整数

Question

我想模拟一个将返回整数1的服务。在端点中它被称为

CompanyNameFetcher.new(params[:filters][:company_name].downcase).call

所有这行我想模拟接收1

这是我到目前为止所拥有的:

      let(:company_name_fetcher) do
        class_double CompanyNameFetcher
      end
      before do
        allow(company_name_fetcher).to receive(:new).and_return { 1 }
      end

有错误

Failure/Error: allow(company_name_fetcher).to receive(:new).and_return { 1 }

ArgumentError: wrong number of arguments (given 0, expected 1+)

Answer 1

I want to mock a service that will returns the integer 1. In an endpoint it's called

CompanyNameFetcher.new(params[:filters][:company_name].downcase).call

and all of this line I want to mock to receive 1

选项 1 -allow_any_instance_of

allow_any_instance_of(CompanyNameFetcher).to( 
  receive(:call).and_return(1)
)

选项 2 - 对构造函数进行 stub

mock_fetcher = instance_double(CompanyNameFetcher)
allow(CompanyNameFetcher).to( 
  receive(:new).and_return(mock_fetcher)
)
allow(mock_fetcher).to rececive(:call).and_return(1)