refactor(main): split main.ts into focused runtime modules (#123)

src/main/runtime/internal-subtitle-extraction.test.ts

@@ -0,0 +1,47 @@
+import assert from 'node:assert/strict';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import process from 'node:process';
+import test from 'node:test';
+import {
+  buildFfmpegSubtitleExtractionArgs,
+  extractInternalSubtitleTrackToTempFile,
+  parseTrackId,
+} from './internal-subtitle-extraction';
+
+test('buildFfmpegSubtitleExtractionArgs rejects output paths without an extension', () => {
+  assert.throws(
+    () => buildFfmpegSubtitleExtractionArgs('/tmp/video.mkv', 2, '/tmp/subtitle-output'),
+    /outputPath.*file extension/,
+  );
+});
+
+test('parseTrackId rejects negative track ids', () => {
+  assert.equal(parseTrackId(-1), null);
+  assert.equal(parseTrackId(' -2 '), null);
+});
+
+test('extractInternalSubtitleTrackToTempFile times out stalled ffmpeg process', async () => {
+  const root = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-ffmpeg-timeout-'));
+  const videoPath = path.join(root, 'video.mkv');
+  fs.writeFileSync(videoPath, '');
+
+  try {
+    await assert.rejects(
+      () =>
+        extractInternalSubtitleTrackToTempFile(
+          process.execPath,
+          videoPath,
+          { 'ff-index': 0, codec: 'ass' },
+          {
+            extractionTimeoutMs: 20,
+            spawnArgsOverride: ['-e', 'setTimeout(() => {}, 1000);'],
+          },
+        ),
+      /ffmpeg extraction timed out/,
+    );
+  } finally {
+    fs.rmSync(root, { recursive: true, force: true });
+  }
+});