javascript - assertEquals 中的对象相等

Question

我试图比较两个对象，首先比较它们是否具有相同的键，然后比较它们的键值是否相等，但来自assertEquals的测试仍然失败。我认为这是因为这两个对象位于一个数组内部，所以它实际上是在比较一个对象数组与另一个对象数组。另外，我的实际对象是由函数组成的，而预期对象是文字。

function getRandomIntInclusive(min, max) {
  min = Math.ceil(min);
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function decorateClassListWithAges(classList) {
  return classList.reduce((arr, c) => {
    arr.push({
      'Name': c,
      'Age': getRandomIntInclusive(10, 10) //Currently always 10 for test purposes
    })
    return arr
  }, [])
}

function assertEquals(actual, expected, testName) {

  if (actual == null || typeof actual != 'object')
    return console.log('FAILED: expected ' + JSON.stringify(expected) + ' but got ' + JSON.stringify(actual));

  if (Object.keys(actual).length !== Object.keys(expected).length)
    return console.log('FAILED: expected ' + JSON.stringify(expected) + ' but got ' + JSON.stringify(actual));

     for (let k in actual)
       if (!expected.hasOwnProperty(k))
         return console.log('FAILED: expected ' + JSON.stringify(expected) + ' but got ' + JSON.stringify(actual));

         for (let k in expected) {
           if (actual[k] !== expected[k])
             return console.log('FAILED: expected ' + JSON.stringify(expected) + ' but got ' + JSON.stringify(actual));
         }
  return console.log('passed');
}


let a = ['James', 'Paul']
let e = [{'Name' : 'James', 'Age' : 10}, {'Name' : 'Paul', 'Age' : 10}]
assertEquals(decorateClassListWithAges(a), e)

Answer 1

在这里，您尝试比较两个不同的对象:

for (let k in actual)
       if (!expected.hasOwnProperty(k))
         return console.log('FAILED: expected ' + JSON.stringify(expected) + ' but got ' + JSON.stringify(actual));

         for (let k in expected) {
           if (actual[k] !== expected[k])
             return console.log('FAILED: expected ' + JSON.stringify(expected) + ' but got ' + JSON.stringify(actual));
         }

但在 JS 中，如果两个对象引用完全相同的对象，则它们相等。

您可以使用 lodash isEqual 方法比较这两个对象:

if (!_.isEqual(actual[k], expected[k]))...

尝试下面的代码片段:

 function getRandomIntInclusive(min, max) {
      min = Math.ceil(min);
      max = Math.floor(max);
      return Math.floor(Math.random() * (max - min + 1)) + min;
    }

    function decorateClassListWithAges(classList) {
      return classList.reduce((arr, c) => {
        arr.push({
          'Name': c,
          'Age': getRandomIntInclusive(10, 10) //Currently always 10 for test purposes
        })
        return arr
      }, [])
    }

    function assertEquals(actual, expected, testName) {

      if (actual == null || typeof actual != 'object')
        return console.log('FAILED: expected ' + JSON.stringify(expected) + ' but got ' + JSON.stringify(actual));

      if (Object.keys(actual).length !== Object.keys(expected).length)
        return console.log('FAILED: expected ' + JSON.stringify(expected) + ' but got ' + JSON.stringify(actual));

         for (let k in actual)
           if (!expected.hasOwnProperty(k))
             return console.log('FAILED: expected ' + JSON.stringify(expected) + ' but got ' + JSON.stringify(actual));

             for (let k in expected) {
               if (!_.isEqual(actual[k], expected[k]))
                 return console.log('FAILED: expected ' + JSON.stringify(expected) + ' but got ' + JSON.stringify(actual));
             }
      return console.log('passed');
    }


    let a = ['James', 'Paul']
    let e = [{'Name' : 'James', 'Age' : 10}, {'Name' : 'Paul', 'Age' : 10}]
    assertEquals(decorateClassListWithAges(a), e)

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