refactor(youtube): extract subtitle generation pipeline

launcher/youtube/whisper.test.ts

@@ -0,0 +1,47 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import { buildWhisperArgs } from './whisper';
+
+test('buildWhisperArgs includes threads and optional VAD flags', () => {
+  assert.deepEqual(
+    buildWhisperArgs({
+      modelPath: '/models/ggml-large-v2.bin',
+      audioPath: '/tmp/input.wav',
+      outputPrefix: '/tmp/output',
+      language: 'ja',
+      translate: false,
+      threads: 8,
+      vadModelPath: '/models/vad.bin',
+    }),
+    [
+      '-m',
+      '/models/ggml-large-v2.bin',
+      '-f',
+      '/tmp/input.wav',
+      '--output-srt',
+      '--output-file',
+      '/tmp/output',
+      '--language',
+      'ja',
+      '--threads',
+      '8',
+      '-vm',
+      '/models/vad.bin',
+      '--vad',
+    ],
+  );
+});
+
+test('buildWhisperArgs includes translate flag when requested', () => {
+  assert.ok(
+    buildWhisperArgs({
+      modelPath: '/models/base.bin',
+      audioPath: '/tmp/input.wav',
+      outputPrefix: '/tmp/output',
+      language: 'ja',
+      translate: true,
+      threads: 4,
+    }).includes('--translate'),
+  );
+});