RSpec在简单类中出现错误：请先存根默认值

Question

我想测试遍历哈希数组的简单类，并仅返回状态为Pending且已更新两天以上的类。

fetch_pending.rb

  class FetchPending
    PROJECT_KEY = 'TPFJT'
    TWO_DAYS = Time.now - 2 * 24 * 60 * 60

    def call
      project.select do |issue|
        issue.fields.dig('status', 'name') == 'Pending' &&
          DateTime.parse(issue.fields.dig('updated')) < TWO_DAYS
      end
    end

    private

    def project
      @project ||= Jira::ProjectConnection.new(PROJECT_KEY).call
    end
  end

specs

RSpec.describe FetchPending do
  subject { described_class.new }

  let(:project_key) { 'TSW-123' }
  let(:project_hash) do
    [
      {
        'key': 'TP-47',
        'fields': {
          'status': {
            'name': 'Pending'
          },
          'assignee': {
            'name': 'michael.kelso',
            'emailAddress': '[email protected]'
          },
          'updated': '2020-02-19T13:20:50.539+0100'
        }
      }
    ]
  end
  let(:project) { instance_double(Jira::ProjectConnection) }

  before do
    allow(Jira::ProjectConnection).to receive(:new).with('TSW-123').and_return(project)
    allow(project).to receive(:call).and_return(project_hash)
  end

  it 'return project hash' do
    expect(subject.call).include(key[:'TP-47'])
  end

但是我有一个错误：

Failure/Error: expect(subject.call).include(key[:'TP-47'])

   #<Jira::ProjectConnection (class)> received :new with unexpected arguments
     expected: ("TSW-123")
          got: ("TPFJT")
    Please stub a default value first if message might be received with other args as well.

我在其他一些规范中也遇到了同样的问题，如何对这个变量进行存根处理？我应该用TWO_DAYS吗？

Answer 1

[实际代码正在将FetchPending::ProjectKey作为参数传递给Jira::ProjectConnection.new。

在测试中，您正在定义一个变量：

let(:project_key) { 'TSW-123' }

但是实际上并没有在任何地方使用。

一个简单的解决方法就是更改

allow(Jira::ProjectConnection).to receive(:new).with('TSW-123').and_return(project)

with

allow(Jira::ProjectConnection).to receive(:new).with(described_class::PROJECT_KEY).and_return(project)