Created
March 14, 2021 20:40
-
-
Save izelnakri/55cf66d2d134c694d8d538ca4179089c to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import { assert } from 'chai'; | |
| import { Readable, PassThrough } from 'stream'; | |
| import * as readline from 'readline'; | |
| import { spawn } from 'child_process'; | |
| // Adaptor for Node 10 to adapt readline streams for async iteration. | |
| // (via https://medium.com/@wietsevenema/node-js-using-for-await-to-read-lines-from-a-file-ead1f4dd8c6f) | |
| function readLines(input: Readable): Readable { | |
| let output = new PassThrough({ objectMode: true }); | |
| let lines = readline.createInterface({ input }); | |
| lines.on('line', line => output.write(line)); | |
| lines.on('close', () => output.destroy()); | |
| return output; | |
| } | |
| const NODE: string = process.execPath; | |
| describe('Test a child processes', () => { | |
| it('counts to three', async () => { | |
| let child = spawn(NODE, ['-e', "console.log(1); console.log(2); console.log(3);"]); | |
| let i = 0; | |
| for await (let line of readLines(child.stdout)) { | |
| assert.strictEqual(++i, Number(line)); | |
| } | |
| }); | |
| }); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment