feat: Add Progressive Web App (PWA) support with service worker, manifest, and icons, including associated tests.

tests/backend/test_pwa.py

@@ -0,0 +1,68 @@
+"""
+Tests pour les routes PWA (manifest.json, sw.js).
+
+Couvre:
+- Servir le manifest à la racine
+- Servir le Service Worker à la racine avec l'en-tête Service-Worker-Allowed
+- Validation du contenu JSON du manifest
+"""
+
+import json
+
+import pytest
+
+pytestmark = pytest.mark.unit
+
+
+class TestManifest:
+    """Tests pour GET /manifest.json."""
+
+    @pytest.mark.asyncio
+    async def test_manifest_served(self, client):
+        """Le manifest est servi à /manifest.json avec le bon content-type."""
+        resp = await client.get("/manifest.json")
+        assert resp.status_code == 200
+        content_type = resp.headers.get("content-type", "")
+        assert "manifest+json" in content_type or "application/json" in content_type
+
+    @pytest.mark.asyncio
+    async def test_manifest_valid_json(self, client):
+        """Le manifest contient les champs PWA requis."""
+        resp = await client.get("/manifest.json")
+        assert resp.status_code == 200
+        data = json.loads(resp.text)
+        assert "name" in data
+        assert "icons" in data
+        assert "start_url" in data
+        assert "display" in data
+        assert data["display"] == "standalone"
+        assert len(data["icons"]) >= 2
+
+
+class TestServiceWorker:
+    """Tests pour GET /sw.js."""
+
+    @pytest.mark.asyncio
+    async def test_sw_served(self, client):
+        """Le Service Worker est servi à /sw.js."""
+        resp = await client.get("/sw.js")
+        assert resp.status_code == 200
+        content_type = resp.headers.get("content-type", "")
+        assert "javascript" in content_type
+
+    @pytest.mark.asyncio
+    async def test_sw_has_scope_header(self, client):
+        """Le Service Worker a l'en-tête Service-Worker-Allowed."""
+        resp = await client.get("/sw.js")
+        assert resp.status_code == 200
+        assert resp.headers.get("service-worker-allowed") == "/"
+
+    @pytest.mark.asyncio
+    async def test_sw_contains_cache_logic(self, client):
+        """Le Service Worker contient la logique de cache."""
+        resp = await client.get("/sw.js")
+        assert resp.status_code == 200
+        body = resp.text
+        assert "caches" in body
+        assert "install" in body
+        assert "fetch" in body