尽管没有差异，RSpec 失败的参数匹配期望答案

【问题标题】：RSpec Fails argument match expectation despite no diff尽管没有差异，RSpec 失败的参数匹配期望
【发布时间】：2020-07-12 15:39:47
【问题描述】：

您如何期望正确的ActiveRecord::Relation 作为关键字参数发送？我以前见过这种问题，过去使用hash_including matcher 解决了这个问题，但没有ActiveRecord::Relation。这太令人沮丧了，因为错误表明期望值和实际收到的值之间没有 diff。

我有一个看起来像这样的规范：

describe ProcessAccountsJob, type: :job do
  subject { described_class.new }
  let!(:incomplete) { create(:account, :incomplete_account) }

  it 'calls process batch service' do
    expect(ProcessAccounts).to receive(:batch).with(
      accounts: Account.where(id: incomplete.id)
    )
    subject.perform
  end
end

我得到一个看起来像这样的错误：

  1) ProcessAccounts calls process batch service
     Failure/Error: ProcessAccounts.batch(accounts: accounts)

       ProcessAccounts received :batch with unexpected arguments
         expected: ({:accounts=>#<ActiveRecord::Relation [#<Account id: 14819, account_number: nil...solar: nil, pap: nil, types: [], annualized_usage: nil>]>})
              got: ({:accounts=>#<ActiveRecord::Relation [#<Account id: 14819, account_number: nil...solar: nil, pap: nil, types: [], annualized_usage: nil>]>})
       Diff:

     # ./app/jobs/process_accounts_job.rb:13:in `perform'
     # ./spec/jobs/process_accounts_job_spec.rb:9:in `block (2 levels) in <main>'

如前所述，尝试使用 hash_including 并没有帮助。当规范更改为：

describe ProcessAccountsJob, type: :job do
  subject { described_class.new }
  let!(:incomplete) { create(:account, :incomplete_account) }

  it 'calls process batch service' do
    expect(ProcessAccounts).to receive(:batch).with(
      hash_including(accounts: Account.where(id: incomplete.id))
    )
    subject.perform
  end
end

差异变为：

       -["hash_including(:accounts=>#<ActiveRecord::Relation [#<Account id: 14822, account_number: nil, service_address: \"123 Main St\", created_at: \"2020-07-12 15:50:00\", updated_at: \"2020-07-12 15:50:00\", solar: nil, pap: nil, types: [], annualized_usage: nil>]>)"]
       +[{:accounts=>
       +   #<ActiveRecord::Relation [#<Account id: 14822, account_number: nil, service_address: "123 Main St", created_at: "2020-07-12 15:50:00", updated_at: "2020-07-12 15:50:00", solar: nil, pap: nil, types: [], annualized_usage: nil>]>}]

【问题讨论】：

试试hash_including：with(hash_including(accounts: Account.where(id: incomplete.id)))。
@SebastianPalma 是的，这在这种情况下没有帮助。请参阅上面的更新输出。
抱歉，没看到。问题是 match 正在检查两个对象是否相同，而它们不是，除非您以某种方式将它们从 perform 方法传递给ProcessAccounts.batch。 ProcessAccountsJob 是如何定义的？你用什么accounts 在那里打电话给batch？
看来match_array是我这里需要做的。
从 Rspec-rails 5.0.2 -> 5.1.0 升级时随机遇到此错误，使用 hash_including 修复了我的错误。

标签： ruby-on-rails ruby rspec rspec-rails

【解决方案1】：

原来match_array matcher 解决了这种情况下的问题；这很容易引起误解，因为预期的和实际的都不是数组。 ??‍♂️

describe ProcessAccountsJob, type: :job do
  subject { described_class.new }
  let!(:incomplete) { create(:account, :incomplete_account) }

  it 'calls process batch service' do
    expect(ProcessAccounts).to receive(:batch).with(
      accounts: match_array(Account.where(id: incomplete.id))
    )
    subject.perform
  end
end

【讨论】：