Question: how to mock with jest

Although this is for tracing bugs, since my question is specific to csv-parser I thought maybe it's the right place to ask. (hope you don't mind)

I have the following code to parse csv files:

const records = [];
const parser = fs
  .createReadStream(`${process.cwd()}/${file.destination}/${file.filename}`)
  .pipe(parse({}));

for await (const record of parser) {
  records.push(record);
}

I wanted to know how to mock this code in unit tests with jest. Any idea would be appreciated.

No repository file or test is named in the issue. Start with the shown createReadStream(...).pipe(parse({})) entry point and determine how the Jest unit test should isolate it; done means a repeatable unit test can supply mocked stream/parser behavior and verify the collected records.