如何检查测试用例是通过还是失败并知道它的索引值

Question

我需要检查测试用例的状态，例如它是通过还是失败，并知道它的索引值。

我怎样才能做到这一点？

我尝试了二进制搜索。这是代码：

class Array
  def binary_search(val, low = 0, high = length - 1)
    return nil if high < low
    mid = (low + high) >> 1
    case val <=> self[mid]
    when -1
      binary_search(val, low, mid - 1)
    when 1
      binary_search(val, mid + 1, high)
    else
      mid
    end
  end
end

ary = [0, 1, 4, 5, 6, 7, 8, 9, 12, 26, 45, 67, 78, 90]
[0, 42, 45, 24324, 99999].each do |val|
  i = ary.binary_search(val)
  if i
    puts "found #{val} at index #{i}: #{ary[i]}"
  else
    puts "#{val} not found in array"
  end
end

但那是关于是否找到密钥。

Answer 1

您不妨考虑以下事项。

ary = [0, 1, 4, 5, 6, 7, 8, 9, 12, 26, 45, 67, 78, 90]
a = [0, 42, 45, 24324, 99999]

h = ary.each_with_index.to_h
  #=> {0=>0, 1=>1, 4=>2, 5=>3, 6=>4, 7=>5, 8=>6, 9=>7, 12=>8, 26=>9,
  #    45=>10, 67=>11, 78=>12, 90=>13}

a.each do |val|
   i = h[val]
   puts i ? "found #{val} at index #{i}: #{ary[i]}" : "#{val} not found in array"
end
found 0 at index 0: 0
42 not found in array
found 45 at index 10: 45
24324 not found in array
99999 not found in array

使用散列可以快速查找键和h 中的匹配值a。