在下面的rspec示例中，为什么when Question不正确？

require "rails_helper"
class Question
end

describe Question do
  it "confuses me" do
    klass = Question

    # this passes
    expect(klass).to eq(Question)

    # this doesn't fail (thankfully)
    fail "loudly" if klass != Question

    case klass
    when Question # this doesn't match 🤔???
      tada = "🎉"
      expect(tada).to eq("🎉")
    else
      # why?????
      fail "into confusion"
    end
  end
end

不，这不是一个课程作业，哈哈。我在工作中遇到了这个现在我不知道什么是真的了。
边注，使用字符串比较工作：

require "rails_helper"
class Question
end

describe Question do
  it "confuses me" do
    klass = Question

    # this passes
    expect(klass).to eq(Question)

    # this doesn't fail (thankfully)
    fail "loudly" if klass != Question

    case klass.to_s
    when Question.to_s # this doesn't match 🤔???
      tada = "🎉"
      expect(tada).to eq("🎉")
    else
      # why?????
      fail "into confusion"
    end
  end
end

另一方面：使用rspec是测试这种意外行为的方便方法。这个问题与rspec无关。