单元测试 mocha Visual Studio 代码描述未定义

Question

如果我运行在控制台中测试运行没问题

        mocha --require ts-node/register tests/**/*.spec.ts

注意：我安装了 mocha 和 mocha -g

我想运行来自 Visual Studio 代码

的单元测试

launcgh.js 文件

            "version": "0.2.0",
            "configurations": [
                {
                    "type": "node",
                    "request": "launch",
                    "name": "Mocha Tests",
                    "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
                    "args": [
                        "--require", 
                        "ts-node/register",
                        "-u",
                        "tdd",
                        "--timeout",
                        "999999",
                        "--colors",
                        "${workspaceFolder}/tests/**/*.spec.ts"
                    ],
                    "internalConsoleOptions": "openOnSessionStart"
                },

非常简单的测试文件

            import { expect } from 'chai';
            const hello = () => 'Hello world!'; 
            describe('Hello function', () => {
                it('should return hello world', () => {
                    const result = hello();
                    expect(result).to.equal('Hello world!');
                });
            });

但在 Visual studio 代码调试控制台中

            /usr/local/bin/node --inspect-brk=15767 node_modules/mocha/bin/_mocha --require ts-node/register -u tdd --timeout 999999 --colors /Applications/MAMP/htdocs/ddd-board-game/backend/tests/**/*.spec.ts 
            Debugger listening on ws://127.0.0.1:15767/bdec2d9c-39a7-4fb7-8968-8cfed914ea8d
            For help, see: https://nodejs.org/en/docs/inspector
            Debugger attached.
            /Applications/MAMP/htdocs/ddd-board-game/backend/tests/dummy.spec.ts:3
            source-map-support.js:441
            describe('Hello function', () => {
            ^
            ReferenceError: describe is not defined
            source-map-support.js:444
                at Object.<anonymous> (/Applications/MAMP/htdocs/ddd-board-game/backend/tests/dummy.spec.ts:1:1)
                at Module._compile (internal/modules/cjs/loader.js:701:30)
                at Module.m._compile (/Applications/MAMP/htdocs/ddd-board-game/backend/node_modules/ts-node/src/index.ts:414:23)

Answer 1

终于！！！经过长时间的搜索和阅读一些教程和评论后，我找到了解决方案：问题出在配置上。

打开测试配置文件并删除以下行：

            "-u", <<<< delete this line
            "tdd", <<<< delete this line

launch.js

        "version": "0.2.0",
        "configurations": [
            {
                "type": "node",
                "request": "launch",
                "name": "Mocha Tests",
                "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
                "args": [
                    "--require", 
                    "ts-node/register",
                    "-u", <<<< delete this line
                    "tdd", <<<< delete this line
                    "--timeout",
                    "999999",
                    "--colors",
                    "${workspaceFolder}/tests/**/*.spec.ts"
                ],
                "internalConsoleOptions": "openOnSessionStart"
            },

运行再次测试，就可以了。

Answer 2

我在这里偶然发现了 mocha 文档：

Interfaces and UI Switch

TLDR;

--ui, -u开关有两个选项：bdd和tdd。但是，它还声明当未提供 --ui, -u 开关时它将默认为 bdd。

因此，当您使用 --ui tdd 开关时，与 BDD 的 describe(), context(), it(), specify(), before(), after(), beforeEach(), and afterEach() 方法相比，您应该使用提供 suite(), test(), suiteSetup(), suiteTeardown(), setup(), and teardown() 的 TDD 接口。

这就解释了为什么它尖叫 describe 函数未定义。

Answer 3

如果有人要的话，这是我2020年6月的配置。

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Mocha Tests",
            "program": "${workspaceFolder}/node_modules/.bin/mocha",
            "args": [
                "--extension",
                "ts",
                "--watch",
                "src",
                "--require",
                "ts-node/register",
                "${workspaceFolder}/src/**/*.spec.ts"
            ],
            "internalConsoleOptions": "openOnSessionStart"
        }   
    ]
}

将 "src", 更改为您的自定义位置，将 "${workspaceFolder}/src/**/*.spec.ts" 更改为您的自定义测试文件

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