我有三个模型规范，它们的代码相似，但预期的数值结果稍有不同。我没有重复代码三次，而是尝试用一种干燥的方式来完成。
代码如下：

tests = [
  {test_name: "this-year", arrival_date: 2.days.ago,    ytd: 1, ly: 0},
  {test_name: "last-year", arrival_date: 14.months.ago, ytd: 0, ly: 1},
  {test_name: "very old",  arrival_date: 3.years.ago,   ytd: 0, ly: 0},
]

tests.each do |t|
  it "increments #{t[:test_name]} order correctly" do
    expect{
      order = create(:order, buyer: @bs.buyer, seller: @bs.seller, arrival_date: t[:arrival_date])
      @bs.reload
    }.to change{ @bs.orders_count }.from(0).to(1)
    .and change{ @bs.orders_count_ytd }.from(0).to(t[:ytd])
    .and change{ @bs.orders_count_ly }.from(0).to(t[:ly])
  end
end

对我来说，这个设置很有意义--它允许我们很容易地看到测试之间的区别，并且它消除了冗余代码。
但是，这会引发错误：

[Test 1]: expected `@bs.orders_count_ly` to have changed from 0 to 0, but did not change
[Test 2]: expected `@bs.orders_count_ytd` to have changed from 0 to 0, but did not change
[Test 3]: expected `@bs.orders_count_ytd` to have changed from 0 to 0, but did not change
            ...and:
          expected `@bs.orders_count_ly` to have changed from 0 to 0, but did not change

我所知道的唯一的解决方案是添加丑陋的if/then类型语句来改变基于测试的期望，但这似乎使这种方法的优点（简洁和清晰）变得没有意义。有没有一种优雅的方式来完成这项工作，尊重既定的模式？