在Node.js中没有与Mocha一起运行的承诺

Question

I have some code which makes use of promises, but it fails to run when run through Mocha. I have simplified it to the essentials:

process.env.NODE_ENV = 'test';

const Promise = require('bluebird');

console.log('zzzz IN');
Promise.resolve('xxx').then(function(val) {
    console.log('[normal]', val);
}).catch(function(error) {
    console.log('[error]', error);

})
console.log('zzzz OUT');

when run via node test/index.js I get:

zzzz IN
zzzz OUT
[normal] xxx

but via mocha:

> my-server@0.0.1 test /Users/ajmas/Development/mocha-and-promise
> eslint lib && mocha --timeout 10000

zzzz IN
zzzz OUT


0 passing (0ms)

Is this an issue in Mocha or in the way I have configured things?

Package.json:

{
    "name": "my-server",
    "version": "0.0.1",
    "description": "Mocha and Promises test case",
    "main": "lib/main.js",
    "scripts": {
        "start-dev": "NODE_ENV=dev node test/index.js",
        "start-dev-debug": "DEBUG=express:* npm run start-dev",
        "start": "node lib/main.js",
        "test": "eslint lib && mocha --timeout 10000"
    },
    "engines": {
        "node": ">=6.7.0"
    },
    "dependencies": {
        "bluebird": "^3.4.6"
    },
    "devDependencies": {
        "chai": "^3.5.0",
        "chai-http": "^3.0.0",
        "eslint": "^3.8.1",
        "eslint-config-standard": "^6.2.1",
        "eslint-plugin-promise": "^3.3.0",
        "eslint-plugin-standard": "^2.0.1",
        "mocha": "^3.2.0"
    }
}

Running with node 6.7.0 on MacOS X 10.12.2. Have also tried with ' bluebird ', ' promise ' and native Promise, but same behaviour with each.

BTW this code is meant to be part of the application I am integration testing, but because no promises are completing I can't launch the server from within Mocha.

Answer 1

Turns out it works, but you need to put the code with an 'it' function call, such that:

it('Run the promise', function(done) {
    Promise.resolve('xxx').then(function(val) {
        console.log('[normal]', val);
    }).catch(function(error) {
        console.log('[error]', error);
    })
})