如何测试在节点中抛出的特定异常。js和水龙头

I use assert(...) on methods to validate arguments, e.g.

我在方法上使用assert(…)来验证参数，例如。

var assert = require('assert')

function someFunction(a, b, c) {
  assert(a, 'a required')
  assert(b, 'b required')
  assert(c, 'c required')
}

I am using tap and would like to write a test to validate that an assert exception was thrown. I cannot just test that another error is thrown, because the assert is essentially an early-guard. The bad input will eventually throw an error.

我正在使用tap并希望编写一个测试来验证抛出了断言异常。我不能只测试另一个错误，因为断言本质上是一个早期的守卫。错误的输入最终会抛出一个错误。

1 个解决方案

#1

You compare against an assert.AssertionError in your t.throws() e.g.

与断言进行比较。你的t.throw()中的AssertionError ()

var test = require('tap').test

test('calling someFunction without arguments', function(t){
  t.throws(function(){
    someFunction()
  }, new assert.AssertionError({
    message: 'a required'
  }), 'throws assert error')
  t.end()
})

The AssertionError takes an object in it's constructor whose .message property will be compared against the thrown exception.

AssertionError在其构造函数中获取一个对象，该对象的.message属性将与抛出的异常进行比较。

#1