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

test/storage-client-integration.test.js

@@ -0,0 +1,39 @@
+"use strict";
+
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const { createStorageAdapter } = require("../src/integrations/storage-client");
+
+test("uploadAudio sends put command", async () => {
+  const sent = [];
+  const adapter = createStorageAdapter({
+    bucket: "b1",
+    client: {
+      async send(command) {
+        sent.push(command.input);
+      },
+    },
+    signedUrlFactory: async () => "https://signed.example",
+  });
+
+  const res = await adapter.uploadAudio({
+    key: "audio/1.mp3",
+    body: Buffer.from("abc"),
+  });
+
+  assert.equal(res.bucket, "b1");
+  assert.equal(sent.length, 1);
+  assert.equal(sent[0].Bucket, "b1");
+  assert.equal(sent[0].Key, "audio/1.mp3");
+});
+
+test("getSignedDownloadUrl uses provided signer", async () => {
+  const adapter = createStorageAdapter({
+    bucket: "b1",
+    client: { async send() {} },
+    signedUrlFactory: async (_client, command, options) => `signed:${command.input.Key}:${options.expiresIn}`,
+  });
+
+  const url = await adapter.getSignedDownloadUrl("audio/2.mp3", 120);
+  assert.equal(url, "signed:audio/2.mp3:120");
+});