使用Cypress和Node-imap接收邮件的测试在缺少“net”模块时失败。

Question

我想使用节点imap或来自Cypress中NPM的imap包来检查是否收到了某些电子邮件并检查它们的内容。

当我尝试从imap和docs中获取的示例中的基本副本时，它会失败，出现以下错误：

./node_modules/imap/lib/Connection.js
Module not found: Error: Can't resolve 'net' in '/Users/username/Documents/test-e2e/node_modules/imap/lib'
resolve 'net' in '/Users/username/Documents/test-e2e/node_modules/imap/lib'
  Parsed request is a module
  using description file: /Users/username/Documents/test-e2e/node_modules/imap/package.json (relative path: ./lib)
    Field 'browser' doesn't contain a valid alias configuration
    resolve as module
      /Users/username/Documents/test-e2e/node_modules/imap/lib/node_modules doesn't exist or is not a directory
      /Users/username/Documents/test-e2e/node_modules/node_modules doesn't exist or is not a directory
      /Users/username/Documents/node_modules doesn't exist or is not a directory
      /Users/username/node_modules doesn't exist or is not a directory
      /Users/node_modules doesn't exist or is not a directory
      /node_modules doesn't exist or is not a directory
      looking for modules in /Users/username/Documents/test-e2e/node_modules/imap/node_modules
        using description file: /Users/username/Documents/test-e2e/node_modules/imap/package.json (relative path: ./node_modules)
          Field 'browser' doesn't contain a valid alias configuration
      looking for modules in /Users/username/Documents/test-e2e/node_modules
        using description file: /Users/username/Documents/test-e2e/package.json (relative path: ./node_modules)
          Field 'browser' doesn't contain a valid alias configuration
          using description file: /Users/username/Documents/test-e2e/node_modules/imap/package.json (relative path: ./node_modules/net)
            no extension
              Field 'browser' doesn't contain a valid alias configuration
          using description file: /Users/username/Documents/test-e2e/package.json (relative path: ./node_modules/net)
            no extension
              Field 'browser' doesn't contain a valid alias configuration
              /Users/username/Documents/test-e2e/node_modules/imap/node_modules/net doesn't exist
            .ts
              Field 'browser' doesn't contain a valid alias configuration
              /Users/username/Documents/test-e2e/node_modules/net doesn't exist
            .ts
              Field 'browser' doesn't contain a valid alias configuration
              /Users/username/Documents/test-e2e/node_modules/imap/node_modules/net.ts doesn't exist
            .js
              Field 'browser' doesn't contain a valid alias configuration
              /Users/username/Documents/test-e2e/node_modules/net.ts doesn't exist
            .js
              Field 'browser' doesn't contain a valid alias configuration
              /Users/username/Documents/test-e2e/node_modules/imap/node_modules/net.js doesn't exist
              /Users/username/Documents/test-e2e/node_modules/net.js doesn't exist
            as directory
              /Users/username/Documents/test-e2e/node_modules/imap/node_modules/net doesn't exist
            as directory
              /Users/username/Documents/test-e2e/node_modules/net doesn't exist

因此不能运行任何测试。我试图寻找这个'net'，也结合imap包，但我真的找不到任何解决方案。有可能在Cypress中使用Imap吗？

Answer 1

Cypress在浏览器中执行它的代码。所以你不能使用这样的NPM模块。要解决这个问题，必须使用cy.task。Cypress在节点进程中执行任务，因此您可以使用任意的lib。任务必须在插件文件中定义，因为该文件是在节点上下文中加载的。

因此，您必须在cypress.json中告诉柏树您使用的是一个插件文件：

{
    ...
    "pluginsFile": "cypress/plugins/plugins.js",
    ...
  }

然后在plugins.js中定义一个任务

on('task', {
    sendMail({ subject, to, body }) {
      return getEmail(subject, to, body);
    }
  });

getEmail应该是您的示例代码。

使用这样的任务：

cy.task("sendMail", { subject, to, body }, { timeout: 30000 });