用嘲笑在Nestjs单元测试中模拟文件对象

发布于 2025-02-12 04:20:03 字数 987 浏览 0 评论 0原文

我最近开始使用nest.js及其内置单元测试库开玩笑，而在上传一个.csv文件并在其上执行某些操作的任务，我决定也单位测试端点，这要求我模拟该端点CSV文件对象，因此

const mockFile = {
  fieldname: 'file',
  originalname: 'TradeHistory.csv',
  encoding: '7bit',
  mimetype: 'text/csv',
  buffer: Buffer.from(__dirname + '/../../TradeHistory.csv', 'utf8'),
  size: 51828,
}

我很快就遇到了这些问题；

对于文件上传，我使用的是@useInterceptors（）和@uploadedfile（）
，它采用 file的类型：express.multer.file.file
，它不接受我的模拟文件 object 类型作为参数，

因此我搜索了一种将模拟文件转换为类型 express.multer.file 的方法一段时间后，对我有用的事情变得令人尴尬而直接，就像使用类型的断言作为关键字铸造文件对象 express.multer.file.file

const mockFile = {
  fieldname: 'file',
  originalname: 'TradeHistory.csv',
  encoding: '7bit',
  mimetype: 'text/csv',
  buffer: Buffer.from(__dirname + '/../../TradeHistory.csv', 'utf8'),
  size: 51828,
} as Express.Multer.File

其他方式可能存在，我愿意接受建议

原文

I recently started working with Nest.js and its built-in unit testing library Jest, while on a task to upload a .CSV file and perform some operations on it, I decided to also unit test the endpoint and this required me to mock the CSV file object, which I did as thus

const mockFile = {
  fieldname: 'file',
  originalname: 'TradeHistory.csv',
  encoding: '7bit',
  mimetype: 'text/csv',
  buffer: Buffer.from(__dirname + '/../../TradeHistory.csv', 'utf8'),
  size: 51828,
}

I quickly ran into these issues;

For file upload, I was using the @UseInterceptors() and @UploadedFile()
which takes a type of file: Express.Multer.File
Which won't accept my mocked file object type as an argument

So I searched for a way to convert the mocked file into a type Express.Multer.File
and after a while what worked for me turned out to be embarrassingly simple and straightforward as using the type assertion as keyword to cast the file object Express.Multer.File

const mockFile = {
  fieldname: 'file',
  originalname: 'TradeHistory.csv',
  encoding: '7bit',
  mimetype: 'text/csv',
  buffer: Buffer.from(__dirname + '/../../TradeHistory.csv', 'utf8'),
  size: 51828,
} as Express.Multer.File

Other ways might exist, I'm open to suggestions

分享到QQ

分享到微博