feat: add polar x tts and storage integration adapters with tests

test/audio-generation.test.js

@@ -0,0 +1,59 @@
+"use strict";
+
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const { createAudioGenerationService } = require("../src/services/audio-generation");
+
+test("enqueueJob generates audio and uploads it", async () => {
+  const uploaded = [];
+  const service = createAudioGenerationService({
+    tts: {
+      async synthesize() {
+        return Buffer.from("bytes");
+      },
+    },
+    storage: {
+      async uploadAudio(payload) {
+        uploaded.push(payload);
+      },
+    },
+    logger: { error() {} },
+  });
+
+  const result = await service.enqueueJob({
+    assetId: "a1",
+    text: "hello",
+  });
+
+  assert.equal(result.storageKey, "audio/a1.mp3");
+  assert.equal(uploaded.length, 1);
+  assert.equal(uploaded[0].key, "audio/a1.mp3");
+});
+
+test("enqueueJob invokes onFailed on error", async () => {
+  let failed = false;
+  const service = createAudioGenerationService({
+    tts: {
+      async synthesize() {
+        throw new Error("tts_fail");
+      },
+    },
+    storage: {
+      async uploadAudio() {},
+    },
+    logger: { error() {} },
+  });
+
+  await assert.rejects(
+    () => service.enqueueJob({
+      assetId: "a2",
+      text: "hello",
+      onFailed() {
+        failed = true;
+      },
+    }),
+    /tts_fail/,
+  );
+
+  assert.equal(failed, true);
+});