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_scraper_extended.py

@@ -0,0 +1,45 @@
+import pytest
+import respx
+from httpx import Response
+from app.services.scraper import fetch_page_content
+
+@pytest.mark.asyncio
+@respx.mock
+async def test_fetch_page_content_success():
+    url = "https://example.com"
+    html_content = """
+    <html>
+        <head><title>Test Title</title><meta name="description" content="Test Description"></head>
+        <body>
+            <article>
+                <p>This is a long enough paragraph to be captured by the scraper logic which requires > 30 chars.</p>
+                <p>Another long paragraph that should be joined with the previous one for the final text.</p>
+            </article>
+        </body>
+    </html>
+    """
+    respx.get(url).mock(return_value=Response(200, text=html_content))
+
+    result = await fetch_page_content(url)
+    assert result["title"] == "Test Title"
+    assert result["description"] == "Test Description"
+    assert "This is a long enough paragraph" in result["text"]
+    assert result["error"] is None
+
+@pytest.mark.asyncio
+@respx.mock
+async def test_fetch_page_content_http_error():
+    url = "https://example.com/404"
+    respx.get(url).mock(return_value=Response(404))
+
+    result = await fetch_page_content(url)
+    assert result["error"] == "HTTP 404"
+
+@pytest.mark.asyncio
+@respx.mock
+async def test_fetch_page_content_request_error():
+    url = "https://broken.url"
+    respx.get(url).mock(side_effect=Exception("Connection reset"))
+
+    result = await fetch_page_content(url)
+    assert "Connection reset" in result["error"]