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_ai_extended.py

@@ -0,0 +1,57 @@
+import pytest
+from httpx import AsyncClient
+from unittest.mock import patch, MagicMock
+
+@pytest.mark.asyncio
+async def test_ai_summarize(async_client: AsyncClient, client_a, auth_headers_a):
+    mock_page = {
+        "title": "Example Title",
+        "description": "Example Description",
+        "text": "Example Text content for the page.",
+    }
+    mock_ai_result = {
+        "summary": "This is a summary.",
+        "tags": ["tag1", "tag2"],
+        "model": "gemini-1.5-flash"
+    }
+
+    with patch("app.routers.ai.fetch_page_content", return_value=mock_page), \
+         patch("app.routers.ai.summarize_url", return_value=mock_ai_result), \
+         patch("app.routers.ai.settings.AI_ENABLED", True):
+        
+        payload = {"url": "https://example.com", "language": "français"}
+        response = await async_client.post("/ai/summarize", json=payload, headers=auth_headers_a)
+        
+        assert response.status_code == 200
+        data = response.json()
+        assert data["summary"] == "This is a summary."
+        assert "tag1" in data["tags"]
+        assert data["title"] == "Example Title"
+
+@pytest.mark.asyncio
+async def test_ai_draft_task(async_client: AsyncClient, client_a, auth_headers_a):
+    mock_task = {
+        "title": "Fix Bug",
+        "description": "Fix the bug in the code",
+        "steps": ["Step 1", "Step 2"],
+        "priority": "high",
+        "estimated_time": "1h"
+    }
+
+    with patch("app.routers.ai.draft_task", return_value=mock_task), \
+         patch("app.routers.ai.settings.AI_ENABLED", True):
+        
+        payload = {"description": "Fix bug", "context": "Backend project"}
+        response = await async_client.post("/ai/draft-task", json=payload, headers=auth_headers_a)
+        
+        assert response.status_code == 200
+        data = response.json()
+        assert data["title"] == "Fix Bug"
+        assert data["priority"] == "high"
+
+@pytest.mark.asyncio
+async def test_ai_disabled(async_client: AsyncClient, client_a, auth_headers_a):
+    with patch("app.routers.ai.settings.AI_ENABLED", False):
+        response = await async_client.post("/ai/draft-task", json={"description": "test"}, headers=auth_headers_a)
+        assert response.status_code == 503
+        assert response.json()["detail"] == "AI désactivée"