youtubeDownloader/server/test/ytDlpRunner.test.ts

import { afterEach, describe, expect, it } from 'vitest';
import { YtDlpError, runYtDlp } from '../src/services/ytDlpRunner.js';

describe('runYtDlp', () => {
	afterEach(() => {
		// biome-ignore lint/performance/noDelete: une assignation à `undefined` stockerait la chaîne "undefined" dans process.env.
		delete process.env.YTDLP_PATH;
	});

	it('retourne stdout quand le processus réussit', async () => {
		process.env.YTDLP_PATH = process.execPath;

		const stdout = await runYtDlp(['-e', "console.log('bonjour')"]);

		expect(stdout.trim()).toBe('bonjour');
	});

	it('lève YtDlpError quand le processus se termine en échec', async () => {
		process.env.YTDLP_PATH = process.execPath;

		await expect(runYtDlp(['-e', "console.error('boom'); process.exit(3)"])).rejects.toBeInstanceOf(
			YtDlpError,
		);
	});

	it('appelle onStdoutLine pour chaque ligne, sans attendre la fin du processus', async () => {
		process.env.YTDLP_PATH = process.execPath;
		const lines: string[] = [];

		await runYtDlp(['-e', "console.log('a'); console.log('b'); console.log('c')"], {
			onStdoutLine: (line) => lines.push(line),
		});

		expect(lines).toEqual(['a', 'b', 'c']);
	});

	it('émet le fragment final même sans saut de ligne terminal', async () => {
		process.env.YTDLP_PATH = process.execPath;
		const lines: string[] = [];

		await runYtDlp(['-e', "process.stdout.write('sans-newline')"], {
			onStdoutLine: (line) => lines.push(line),
		});

		expect(lines).toEqual(['sans-newline']);
	});

	it('donne le processus lancé à onSpawn, avant toute sortie', async () => {
		process.env.YTDLP_PATH = process.execPath;
		const spawns: Array<{
			pid: number | undefined;
			canPause: boolean;
			canResume: boolean;
			linesSoFar: number;
		}> = [];
		let lines = 0;

		await runYtDlp(['-e', "console.log('a')"], {
			onSpawn: (child) => {
				spawns.push({
					pid: child.pid,
					canPause: typeof child.stdout.pause === 'function',
					canResume: typeof child.stdout.resume === 'function',
					linesSoFar: lines,
				});
			},
			onStdoutLine: () => {
				lines += 1;
			},
		});

		expect(spawns).toEqual([
			{ pid: expect.any(Number), canPause: true, canResume: true, linesSoFar: 0 },
		]);
		expect(lines).toBe(1);
	});

	it("rejette avec une AbortError quand le signal d'annulation se déclenche", async () => {
		process.env.YTDLP_PATH = process.execPath;
		const controller = new AbortController();

		const promise = runYtDlp(['-e', 'setTimeout(() => {}, 5000)'], { signal: controller.signal });
		controller.abort();

		await expect(promise).rejects.toMatchObject({ name: 'AbortError' });
	});
});