Question

我有一个课程如下......

     class Sequencer

            def initialize(error_raiser: nil)
            @error_raiser = error_raiser || ErrorRaiser.new
            end

            def order(string)
            error_raiser.raise_error(string)
            end

            attr_reader :error_raiser

            end

我如何检查我的sequencer_spec文件中@error_raiser收到带字符串的raise_error？我试过像这样使用一个实例间谍......

  let(:error_raiser) { instance_spy("ErrorRaiser" }
  describe Sequencer do
    describe '.order' do
      it "passes the string to an error_raiser" do
        subject.order("a => b,")
        expect(error_raiser).to have_received(:raise_error).with("a => b")
      end
    end
  end

但是我收到以下错误......

 (InstanceDouble(ErrorRaiser) (anonymous)).raise_error("a => b")
 expected: 1 time with arguments: ("a => b")
 received: 0 times

Answer 1

您应该告诉rspec您将其error_raiser替换为let中定义的错误。

subject.stub(:error_raiser).and_return(error_raiser)

（取决于rspec版本）通常没有必要做一个实例间谍。以下应该有效

describe '.order' do
    it "passes the string to an error_raiser" do
        expect(subject.error_raiser).to receive(:raise_error).with("a => b")
        subject.order("a => b")
    end
end

RSpec，检查实例是否收到了一个方法＆amp;争论

1 个答案: