选择循环内的 RSpec 模拟方法 [英] RSpec mock method inside of select loop

问题描述

我想测试一个简单的类，它遍历哈希数组，并只返回状态为 Pending 且更新时间超过 2 天的类.

I want to test simple class which iterate through array of hashes and return only those with status Pending which were updated more than 2 days ago.

  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

如何测试 fields 方法，它是 Jira-Ruby gem 的方法.我认为它 来自这里(字段类gem 资源) 因为我在其他地方找不到 fields 方法.

How to test fields method which is a method of Jira-Ruby gem. I think it comes from here (Field class in resource of gem) because nowhere else have I found fields method.

以下是我调试后的想法:

Here are my thoughts after debugging:

• project.class - 数组

issue.class - JIRA::Resource::Issue

issue.class - JIRA::Resource::Issue

我的自然想法是:

  before do
    # (...) some other mocks
    allow(JIRA::Resource::Issue).to receive(:fields)
  end

但我收到一个错误:

失败/错误:允许(JIRA::Resource::Issue).to receive(:fields)

Failure/Error: allow(JIRA::Resource::Issue).to receive(:fields)

JIRA::Resource::Issue 没有实现:fields

JIRA::Resource::Issue does not implement: fields

我一直在努力解决这个问题 DAYS，我在这里非常绝望.如何模拟这个方法?

I have been struggling with this problem for DAYS, I'm pretty desperate here. How to mock this method?

这是我的其余规格:

RSpec.describe FetchPending do
  subject { described_class.new }

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

  before do
    allow(Jira::ProjectConnection).to receive(:new).with(described_class::PROJECT_KEY).and_return(project)
    allow(project).to receive(:call).and_return(project_hash)
    allow(JIRA::Resource::Issue).to receive(:fields)
  end

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

推荐答案

and_return 通常用于返回值(例如字符串或整数)或值序列，但有时用于对象需要使用 block.此外，如果 call 是返回 project_hash 值的 Jira::ProjectConnection 对象上的有效方法，则您可以在声明实例 double 时直接模拟其行为(此功能从 Relish 文档中不清楚，因为它们有点可怕).这样的事情可能会奏效:

and_return is generally used for returning a value (such as a string or an integer) or sequence of values, but for objects you sometimes need use a block. Additionally, if call is a valid method on a Jira::ProjectConnection object that returns the value of project_hash, you can directly mock its behavior when declaring your instance double (this functionality is unclear from the Relish docs bc they are kinda terrible). Something like this will probably work:

let(:project) { instance_double(Jira::ProjectConnection, call: project_hash) }

before do
  # Ensure new proj conns always return mocked 'project' obj
  allow(Jira::ProjectConnection).to receive(:new).with(
    described_class::PROJECT_KEY
  ) { project }
end

如果还是不行，尝试暂时用anything替换scribed_class::PROJECT_KEY进行调试；这可以帮助您确认是否指定了发送给 new 的错误参数.

If it still doesn't work, try temporarily replacing described_class::PROJECT_KEY with anything to debug; this can help you confirm if you specified the wrong arg(s) being sent to new.

关于错误信息，它看起来像 JIRA::Resource::Issue 没有 fields 属性/方法，尽管 fields 似乎嵌套在 attrs 中?JIRA::Resource::Project#issues 方法还将 JSON 中的问题转换为问题对象，因此如果您使用该方法，则需要更改 project_hash 的内容.

With regard to the error message, it looks like JIRA::Resource::Issue doesn't have a fields attribute/method, though fields appears to be nested in attrs? The JIRA::Resource::Project#issues method also translates the issues in the JSON into Issue objects, so if you're using that method you will need to change the contents of project_hash.

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