Add comprehensive test suite for image processing and related services

- Implement tests for database generator to ensure proper session handling.
- Create tests for EXIF extraction and conversion functions.
- Add tests for image-related endpoints, ensuring proper data retrieval and isolation between clients.
- Develop tests for OCR functionality, including language detection and text extraction.
- Introduce tests for the image processing pipeline, covering success and failure scenarios.
- Validate rate limiting functionality and ensure independent counters for different clients.
- Implement scraper tests to verify HTML content fetching and error handling.
- Add unit tests for various services, including storage and filename generation.
- Establish worker entry point for ARQ to handle background image processing tasks.

tests/test_storage_extended.py

@@ -0,0 +1,46 @@
+import pytest
+from fastapi import HTTPException
+from app.services.storage import save_upload, delete_files, get_image_url
+from unittest.mock import MagicMock, patch, AsyncMock
+import io
+
+@pytest.mark.asyncio
+async def test_save_upload_unsupported_mime():
+    mock_file = MagicMock()
+    mock_file.content_type = "text/plain"
+    with pytest.raises(HTTPException) as exc:
+        await save_upload(mock_file, "client_id")
+    assert exc.value.status_code == 415
+
+@pytest.mark.asyncio
+@patch("app.services.storage.settings")
+async def test_save_upload_too_large(mock_settings):
+    mock_settings.max_upload_bytes = 10
+    mock_settings.MAX_UPLOAD_SIZE_MB = 10
+    mock_file = MagicMock()
+    mock_file.content_type = "image/jpeg"
+    mock_file.read = AsyncMock(return_value=b"a" * 20)
+    with pytest.raises(HTTPException) as exc:
+        await save_upload(mock_file, "client_id")
+    assert exc.value.status_code == 413
+
+def test_delete_files_exists(tmp_path):
+    f1 = tmp_path / "f1.txt"
+    f1.write_text("hello")
+    f2 = tmp_path / "f2.txt"
+    f2.write_text("world")
+    
+    assert f1.exists()
+    assert f2.exists()
+    
+    delete_files(str(f1), str(f2))
+    
+    assert not f1.exists()
+    assert not f2.exists()
+
+def test_get_image_url():
+    url = get_image_url("img.jpg", "client1")
+    assert "/static/uploads/client1/img.jpg" in url
+    
+    thumb_url = get_image_url("img.jpg", "client1", thumb=True)
+    assert "/static/thumbnails/client1/img.jpg" in thumb_url