feat: add queued image derivative lifecycle

apps/worker/tests/image-derivative-worker.test.js

@@ -1,7 +1,11 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
 
-import { runImageDerivativeJob } from '../src/image-derivative-worker.js';
+import {
+  createInMemoryImageDerivativeQueue,
+  processNextImageDerivativeJob,
+  runImageDerivativeJob,
+} from '../src/image-derivative-worker.js';
 
 test('completes an image derivative job after loading and processing the source', async () => {
   const calls = [];
@@ -37,4 +41,29 @@ test('records a failed image derivative job without throwing worker errors', asy
   assert.equal(result.status, 'FAILED');
   assert.equal(result.error, 'source unavailable');
   assert.ok(result.failedAt instanceof Date);
+});
+
+test('claims queued jobs and persists their processing lifecycle', async () => {
+  const queue = createInMemoryImageDerivativeQueue();
+  await queue.enqueue({ id: 'job-3', type: 'IMAGE_DERIVATIVES', sourceKey: 'queued.jpg', status: 'PENDING' });
+
+  const claimed = await queue.claimNext();
+  assert.equal(claimed.status, 'PROCESSING');
+  assert.equal(queue.getJob('job-3').status, 'PROCESSING');
+
+  const result = await processNextImageDerivativeJob({
+    queue,
+    async loadSource(sourceKey) {
+      return { sourceKey, data: Buffer.from('queued-image') };
+    },
+    processor: {
+      async process(source) {
+        return [{ name: 'thumbnail', key: `${source.sourceKey}-thumbnail.webp` }];
+      },
+    },
+  });
+
+  assert.equal(result.status, 'COMPLETED');
+  assert.equal(queue.getJob('job-3').status, 'COMPLETED');
+  assert.equal(queue.getJob('job-3').derivatives[0].key, 'queued.jpg-thumbnail.webp');
 });