feat(api): add liblib memoir image provider adapter

Made-with: Cursor

api/tests/test_memoir_image_provider.py

@@ -0,0 +1,58 @@
+import unittest
+from unittest.mock import Mock
+
+from api.services.memoir_images.provider import LiblibImageProvider
+
+
+class MemoirImageProviderTest(unittest.TestCase):
+    def test_submit_generation_handles_sync_provider_response(self):
+        http_client = Mock()
+        http_client.post.return_value.json.return_value = {
+            "status": "succeeded",
+            "image_url": "https://provider.example.com/1.png",
+        }
+        provider = LiblibImageProvider(http_client=http_client, api_key="test-key", base_url="https://example.com")
+
+        job = provider.submit_generation(prompt="foo", size="1024x1024", style="watercolor")
+
+        self.assertEqual(job["status"], "completed")
+        self.assertEqual(job["image_url"], "https://provider.example.com/1.png")
+
+    def test_submit_generation_handles_async_provider_response(self):
+        http_client = Mock()
+        http_client.post.return_value.json.return_value = {
+            "task_id": "job-123",
+            "status": "queued",
+        }
+        provider = LiblibImageProvider(http_client=http_client, api_key="test-key", base_url="https://example.com")
+
+        job = provider.submit_generation(prompt="foo", size="1024x1024", style="watercolor")
+
+        self.assertEqual(job["status"], "processing")
+        self.assertEqual(job["job_id"], "job-123")
+
+    def test_poll_until_complete_returns_completed_job(self):
+        http_client = Mock()
+        http_client.get.return_value.json.side_effect = [
+            {"status": "queued"},
+            {"status": "succeeded", "image_url": "https://provider.example.com/1.png"},
+        ]
+        provider = LiblibImageProvider(http_client=http_client, api_key="test-key", base_url="https://example.com")
+
+        job = provider.poll_until_complete(
+            {"status": "processing", "job_id": "job-123"},
+            poll_interval_seconds=0,
+            max_attempts=2,
+        )
+
+        self.assertEqual(job["status"], "completed")
+        self.assertEqual(job["image_url"], "https://provider.example.com/1.png")
+
+    def test_download_image_fetches_binary_payload(self):
+        http_client = Mock()
+        http_client.get.return_value.content = b"png-bytes"
+        provider = LiblibImageProvider(http_client=http_client, api_key="test-key", base_url="https://example.com")
+
+        payload = provider.download_image({"image_url": "https://provider.example.com/1.png"})
+
+        self.assertEqual(payload, b"png-bytes")