How can I test uncaught errors in mocha?

Question

I would like to test that the following function performs as expected:

function throwNextTick(error) {
    process.nextTick(function () {
        throw error;
           


        

Answer 1

Base on timoxley & Casey Foster, in node v6++

const assert = require('assert')

describe('throwNextTick', function() {
    it('works as expected', function(next) {

        function cb(err) {
            assert.equal(err instanceof Error, true)
            next()
        }

        function test(){
            process.nextTick(() => {
                throw new Error('err')
            })
        }

        process.prependOnceListener('uncaughtException', cb)
        test()

    })
})