为什么我的“期望与之一起接收”测试如此缓慢且行为如此怪异？

Question

我有这样的RSpec代码：

describe 'self.run' do
  context 'if the related object is a subclass' do
    it 'ensures proper \'Suggested property - Class\' relationships' do
      allow(described_class).to receive(:inherit_suggested_properties)
      expect(described_class).to receive(:inherit_suggested_properties).once.with(
        CoreObject.find('class-class'),
        CoreObject.find('class-instance-class')
      )
      described_class.run(
        observed_object: CoreObject.find('class-class'),
        this_change_observer: CoreObject.find('observer'),
        related_object: CoreObject.find('class-instance-class'),
        relationship: CoreObject.find('class-class--class-instance-class')
      )
    end
    it 'ensures proper \'Change observer - Object\' relationship' do
      allow(described_class).to receive(:inherit_change_observer)
      expect(described_class).to receive(:inherit_change_observer).once.with(
        CoreObject.find('observer'),
        CoreObject.find('class-instance-class')
      )
      described_class.run(
        observed_object: CoreObject.find('class-class'),
        this_change_observer: CoreObject.find('observer'),
        related_object: CoreObject.find('class-instance-class'),
        relationship: CoreObject.find('class-class--class-instance-class')
      )
    end
  end
  # ...
end

通常它可以工作，但是我注意到这些情况大约需要13秒钟才能运行。奇怪的是，当我只运行其中一个时，它也需要大约13秒钟，因此看起来好像是在准备过程中花费的时间。这里发生了什么？我可以以某种方式对其进行优化吗？