Rspec 请求 header 失败

Question

我正在编写一个代码，它将调用一些第 3 方 API。因此，我正在使用 API_HELPER 模块来调用第 3 方 api。

module ApiHelper
    def self.get_header(header)
      @request['Accept'] = header[:accept].blank? ? 'application/json' : header[:accept]
      @request['Content-Type'] = header[:content_type].blank? ? 'application/json' : header[:content_type]
  end
end

这是此帮助程序文件的 Rspec：

describe '.get_header' do
    let(:request) { double('request') }

    before do
      allow(ApiHelper).to receive(:get_header).and_call_original
      allow(ApiHelper).to receive(:instance_variable_get).and_return(request)
      allow(request).to receive(:[]=)
    end

    context 'when header values are provided' do
      let(:header) { { accept: 'application/json', content_type: 'application/json' } }

      it 'sets the Accept and Content-Type header values' do
        ApiHelper.get_header(header)
        expect(request).to have_received(:[]=).with('Accept', 'application/json')
        # expect(request).to have_received(:[]=).with('Content-Type', 'application/json')
      end
    end

    context 'when header values are not provided' do
      let(:header) { {} }

      it 'sets default values for the Accept and Content-Type headers' do
        ApiHelper.get_header(header)
        expect(request).to have_received(:[]=).with('Accept', 'application/json')
        expect(request).to have_received(:[]=).with('Content-Type', 'application/json')
      end
    end
  end

但是我运行这个规范，它显示错误：

Failures:

  1) ApiHelper.get_header when header values are provided sets the Accept and Content-Type header values
     Failure/Error: expect(request).to have_received(:[]=).with('Accept', 'application/json')
     
       (Double "request").[]=("Accept", "application/json")
           expected: 1 time with arguments: ("Accept", "application/json")
           received: 0 times
     # ./spec/helpers/api_helper_spec.rb:41:in `block (4 levels) in <top (required)>'

  2) ApiHelper.get_header when header values are not provided sets default values for the Accept and Content-Type headers
     Failure/Error: expect(request).to have_received(:[]=).with('Accept', 'application/json')
     
       (Double "request").[]=("Accept", "application/json")
           expected: 1 time with arguments: ("Accept", "application/json")
           received: 0 times
     # ./spec/helpers/api_helper_spec.rb:51:in `block (4 levels) in <top (required)>'

Finished in 0.23741 seconds (files took 1.39 seconds to load)
4 examples, 2 failures

我不明白什么会更正此代码的 rspec。

Answer 1

@request与您的double('request')无关。

这实际上测试起来有点棘手，因为它是一个模块。

一种方法是创建一个 class 以混入模块。

class ControllerHarness
  include ApiHelper

  def initialize request
    @request = request

然后用测试替身实例化 class。

let(:controller) { ControllerHarness.new(request) }