javascript - Sinon - 如何检查数组键是否都具有特定值？

Question

我应该先说明我以前从未写过单元测试，所以如果你能对我说清楚并且不要假定你了解高级实践的话。比你。

我正在尝试创建一个单元测试来检查以确保每个键 "x" 都具有 "y" 的值。我的 javascript 将 "a"、"b" 或 "c" 传递到 module.exports.handler = async (letter ) =>。

这会根据参数 "a"、"b" 或 "c" 过滤 JSON> 并返回具有键/值对的对象数组。

如果传入"a"，则键为"x"的对象数组都具有值"y"；

如果 "b" 作为参数传递，则键为 "x" 的对象数组的值为 "z"；

最后，如果传入参数 "c"，则具有键 "x" 的对象数组的值为 "w" .

 describe('filtering spec', () => {
   it('should return an array of objects each of which with y as the value', async () => {
     // Makes sure the returned array of objects all have y as the corresponding value for key x
   });

   it('should return an array of objects each of which with z as the value', async () => {
     // Makes sure the returned array of objects all have z as the corresponding value for the key x
   });

   it('should return an array of objects each of which with y as the value', async () => {
     // Makes sure the returned array of objects all have w as the corresponding value for the key x
   });

我猜我最终会以某种方式使用 matcher(参见 https://sinonjs.org/releases/latest/matchers/)

Answer 1

我建议您使用 Array.Filter方法来查看是否有任何对象具有不需要的值，如果有，那么您的测试应该会失败。

let array = [{x: "y"}, {x: "y"}, {x: "y"}, {x: "b"}]

isCorrect = (array, req) => {
  return (array.filter(v => v.x !== req))
}

console.log(isCorrect(array, "y").length ? "failed" : "passed")

如评论中所述，Array.some实际上至少快 18%!

let isSome = (list, req) => {
    return (list.some(v => v.x === req))
}

你也可以使用，Array.includes ...