Mocha测试无法在nodejs服务器上运行

Question

目的

找出我失败断言时我的测试崩溃的原因.

背景

我有一个非常简单的NodeJs应用程序,我使用Mocha for BDD而没有断言框架(只是来自NodeJs的基本断言).

我使用我的Mocha测试npm test,我有以下package.json文件:

{
  "name": "server",
  "version": "1.0.0",
  "description": "Mah Project!",
  "main": "index.js",
  "scripts": {
    "test": "mocha test.js",
    "test-kitten": "mocha -R nyan test.js",
    "watch": "gulp watch",
    "start": "node server.js"
  },
  "repository": {
    "type": "git",
    "url": ""
  },
  "keywords": [
    "awesome"
  ],
  "author": "Rick and Morty",
  "license": "ISC",
  "homepage": "",
  "dependencies": {
    "express": "^4.14.0",
    "mongodb": "^2.2.6",
    "underscore": "^1.8.3"
  },
  "devDependencies": {
    "gulp": "^3.9.1",
    "gulp-mocha": "^3.0.1",
    "mocha": "^3.0.2",
    "superagent": "^2.2.0"
  }
}

码

为了尝试Mocha,我创建了一个非常简单的测试:

"use strict";

let assert = require("assert");

describe("server", function(){
    it("prints out 'Hello, world'", function(){
        assert.equal('A', 'B');
    });
});

问题

当我有assert.equal('A', 'A');,测试通过,一切都很好.

但是,当我有assert.equal('A', 'B');,测试失败(按照预期),但应用程序也崩溃了!

根据我正在关注的教程,这不应该崩溃:

• https://youtu.be/MrZ-XwDGPto?t=146

它还会创建一个调试文件:

0 info it worked if it ends with ok
1 verbose cli [ '/home/ubuntu/.nvm/versions/node/v4.4.5/bin/node',
1 verbose cli   '/home/ubuntu/.nvm/versions/node/v4.4.5/bin/npm',
1 verbose cli   'run',
1 verbose cli   'test' ]
2 info using npm@2.15.5
3 info using node@v4.4.5
4 verbose run-script [ 'pretest', 'test', 'posttest' ]
5 info pretest server@1.0.0
6 info test server@1.0.0
7 verbose unsafe-perm in lifecycle true
8 info server@1.0.0 Failed to exec test script
9 verbose stack Error: server@1.0.0 test: `mocha test.js`
9 verbose stack Exit status 1
9 verbose stack     at EventEmitter.<anonymous> (/home/ubuntu/.nvm/versions/node/v4.4.5/lib/node_modules/npm/lib/utils/lifecycle.js:217:16)
9 verbose stack     at emitTwo (events.js:87:13)
9 verbose stack     at EventEmitter.emit (events.js:172:7)
9 verbose stack     at ChildProcess.<anonymous> (/home/ubuntu/.nvm/versions/node/v4.4.5/lib/node_modules/npm/lib/utils/spawn.js:24:14)
9 verbose stack     at emitTwo (events.js:87:13)
9 verbose stack     at ChildProcess.emit (events.js:172:7)
9 verbose stack     at maybeClose (internal/child_process.js:827:16)
9 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:211:5)
10 verbose pkgid server@1.0.0
11 verbose cwd /home/ubuntu/workspace/server
12 error Linux 4.2.0-c9
13 error argv "/home/ubuntu/.nvm/versions/node/v4.4.5/bin/node" "/home/ubuntu/.nvm/versions/node/v4.4.5/bin/npm" "run" "test"
14 error node v4.4.5
15 error npm  v2.15.5
16 error code ELIFECYCLE
17 error server@1.0.0 test: `mocha test.js`
17 error Exit status 1
18 error Failed at the server@1.0.0 test script 'mocha test.js'.
18 error This is most likely a problem with the server package,
18 error not with npm itself.
18 error Tell the author that this fails on your system:
18 error     mocha test.js
18 error You can get information on how to open an issue for this project with:
18 error     npm bugs server
18 error Or if that isn't available, you can get their info via:
18 error
18 error     npm owner ls server
18 error There is likely additional logging output above.
19 verbose exit [ 1, true ]

纠正暂定

我试着纠正这个

"dependencies": {
    "express": "^4.14.0",
    "mongodb": "^2.2.6",
    "underscore": "^1.8.3",
    "gulp": "^3.9.1",
    "gulp-mocha": "^3.0.1",
    "mocha": "^3.0.2",
    "superagent": "^2.2.0"
}

并devDependencies从package.json中完全删除对象,但这不是一个真正的解决方案,只是解决问题的一个微薄的解决方法.如果我有一个仅用于开发环境的软件包和工具,我应该可以单独使用和安装它们!

即使在之前的尝试之后问题仍然存在.

题

• 当断言失败时,为什么我的代码会崩溃？

Answer 1

TL; DR

这是某种预期的行为npm run.

说明

经过长时间的搜索,我发现了一种以正确方式引导我的威胁:

• 运行测试时npm错误ELIFECYCLE

这里发生的是,mocha返回失败测试的数量.因此,如果所有测试都通过,则mocha返回0并继续npm而不抛出异常.

但是,如果X测试失败,则mocha将返回X.因为运行脚本的返回结果与0不同,所以npm将使用代码X引发异常并且将无法执行.

放空

就个人而言,这种行为是废话.我不知道在这里应该责怪谁,如果mocha在任意数量的测试失败时返回一个任意数字,npm是拒绝0以外的任何东西,或者我,因为显然不知道如何运行测试,或者至少保持这些技术......

现在我需要继续寻找一种使用mocha和npm运行测试的好方法.希望这有助于某人.