如何在Docker中为Node.js应用程序设置单元测试?

问题描述：

我正在尝试为我的节点应用程序运行摩卡单元测试.该应用程序是由docker映像构建的.

I am trying to run mocha unit test for my node application. The application is built by a docker image.

Docker映像:

FROM node:6.10.0-alpine

RUN mkdir -p /app
WORKDIR /app

COPY package.json /app
RUN npm install

COPY . /app

EXPOSE 3000
CMD ["npm", "start"]

Docker撰写:

version: "3"
services:
  web: #### nodejs image
    build: .
    volumes:
      - ./app/         
    ports:
      - "3000:3000"
    depends_on:
      - db
  db:
    build:  ##### postgres db image
      context: .
      dockerfile: dbDockerfile
    ports:
      - 5432:5432

可以按预期构建和运行安装程序.问题不在于我不确定如何运行mocha之类的单元测试命令来执行测试.

The setup can be built and worked as expected. The problem is not I am sure how to run unit test commands like mocha to perform the test.

我看到了一个名为dockunit的模块，但是我不确定这是否是目前的唯一方法.有人可以帮我这个忙吗?

I see a module called dockunit but I am not sure if that's the only way for now. Can anyone help me out about this?

答

使用docker(和docker-compose)，您可以在容器中运行任意命令. Dockerfile定义了没有指定其他命令时运行的默认命令，但这并不意味着它是唯一可以运行的命令.

With docker (and docker-compose), you can run arbitrary commands in a container. The Dockerfile defines the default command that is run when no other command is specified, but that doesn't mean it's the only one you can run.

在您的情况下:如果未指定其他命令，则运行npm start.当您执行docker-compose up时会发生这种情况.

In your case: npm start is run when no other command is specified. That happens when you do docker-compose up.

但是，您可以使用docker run或docker-compose run运行任何命令.对于您的测试，可能看起来像这样:docker-compose run web mocha.

But, you can run any command using docker run or docker-compose run. For your tests, that might look like this: docker-compose run web mocha.

up和run略有不同，我鼓励您继续阅读以下内容:

There is a slight difference in up and run, and I encourage you to read up on it: Should I use docker-compose start up or run?

这对您入门有帮助吗?

如何在Docker中为Node.js应用程序设置单元测试?

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