node.js - 循环 Mocha 测试

Question

我正在尝试使用 mocha 中的数据提供程序来编写更少的代码

var should = require('should'); 
var assert = require('assert');
var request = require('supertest');  
var mongoose = require('mongoose');
var winston = require('winston');
var config = require('../app/config');

describe('Authentification', function() {
    var url = config.web.protocol + '://' + config.web.host + ':' + config.web.port;

    describe('signin',function()
    {
        var provider = [
            {
                describe: 'should return error trying to signin with empty body',
                body: {},
                status: 404,
                message: "firstName not found"
            },
            {
                describe: 'should return error trying to signin with no first name',
                body: {
                    lastName: 'test',
                    password: 'test',
                    email: 'test'
                },
                status: 404,
                message: "firstName not found"
            },
            {
                describe: 'should return error trying to signin with no last name',
                body: {
                    firtsName: 'test',
                    password: 'test',
                    email: 'test'
                },
                status: 404,
                message: "lastName not found"
            },
            {
                describe: 'should return error trying so signin with no password',
                body: {
                    lastName: 'test',
                    firstName: 'test',
                    email: 'test'
                },
                status: 404,
                message: "password not found"
            },
            {
                describe: 'should return error trying so signin with no email',
                body: {
                    lastName: 'test',
                    password: 'test',
                    firstName: 'test'
                },
                status: 404,
                message: "email not found"
            },
            {
                describe: 'should return error trying so signin a too long firstName',
                body: {
                    firstName: 'kldsfjghsldkglsqkdjghqlkfjdsghldfksjghfdlskjgkldjfsdj',
                    lastName: 'test',
                    password: 'testhdksjdhfb',
                    email: 'test@aa.aa'
                },
                status: 400,
                message: "invalid firstName"
            },
        ];

        for (var i in provider) {
            it(provider[i].describe, function(done) {
            request(url)
                .post('/user/signin')
                .send(provider[i].body)
                .expect(provider[i].status)
                .expect(function(res)
                {
                    assert.equal(res.body.code, provider[i].status);
                    assert.equal(res.body.message, provider[i].message);
                })
                .end(done);
            });
        }
    });
});

但在这种情况下，它只检查最后一个测试。

输出是

  Authentification
    signin
      ✓ should return error trying to signin with empty body 
      ✓ should return error trying to signin with no first name 
      ✓ should return error trying to signin with no last name 
      ✓ should return error trying so signin with no password 
      ✓ should return error trying so signin with no email 
      ✓ should return error trying so signin a too long firstName 


  6 passing (71ms)

但是如果最后一个测试失败，所有其他测试都会失败。如果其中一个测试错误，则测试通过。

可能是异步问题，不知道怎么解决

Answer 1

将您的 for 循环更改为如下所示:

function makeTest(p) {
    it(p.describe, function(done) {
        request(url)
            .post('/user/signin')
            .send(p.body)
            .expect(p.status)
            .expect(function(res) {
                assert.equal(res.body.code, p.status);
                assert.equal(res.body.message, p.message);
            })
            .end(done);
    });
}

for (var i in provider) {
    makeTest(provider[i]);
}

您的代码存在的问题是您实际上只测试了数组中的最后一个元素。 (是的，即使您看到了不同的测试名称。)您传递给 it 的匿名函数将在将来的某个时刻执行，当 Mocha 到达它时。到那时你的循环将完成执行并且 i 的值将是循环赋予它的最后一个值。对于您提供给 it 的第一个参数，这不是问题，因为该参数会立即求值。这就是为什么测试名称没问题，但测试本身只是测试数组中最后一个元素的多个实例。

上面的代码通过将 provider[i] 传递给 makeTest 解决了这个问题。当 makeTest 中的匿名函数引用创建时使用的 p 时，它具有 makeTest 时使用的值打电话。