Remove redis

backend/tests/README.md

@@ -1,6 +1,6 @@
 # Backend API Test Guide
 
-This directory contains the backend API test suite. The tests use pytest, FastAPI's `TestClient`, and an isolated in-memory SQLite database. The goal is to cover the business-critical API behaviour without relying on MySQL, Redis, SMTP, or a running browser.
+This directory contains the backend API test suite. The tests use pytest, FastAPI's `TestClient`, and an isolated in-memory SQLite database. The goal is to cover the business-critical API behaviour without relying on MySQL, SMTP, or a running browser.
 
 ## How To Run
 
@@ -190,8 +190,8 @@ Why it matters:
 
 ## Current Scope
 
-The suite intentionally focuses on API behaviour and database side effects. It does not deeply test:
-- WebSocket connection lifecycle and Redis pub/sub behaviour.
+The suite intentionally focuses on API behaviour, local WebSocket broadcast behaviour, and database side effects. It does not deeply test:
+- Full browser WebSocket lifecycle.
 - Real SMTP delivery.
 - Browser UI behaviour.
 - Every branch of low-level validators or helper functions.

backend/tests/test_app_health.py

@@ -1,3 +1,10 @@
+import json
+
+import pytest
+
+from app.main import ConnectionManager
+
+
 def test_root_returns_api_metadata(client):
     response = client.get("/")
 
@@ -12,3 +19,34 @@ def test_health_check_reports_database_connection(client):
     assert response.status_code == 200
     assert response.json()["status"] == "healthy"
     assert response.json()["database"] == "connected"
+
+
+class FakeWebSocket:
+    def __init__(self, fail_send=False):
+        self.accepted = False
+        self.fail_send = fail_send
+        self.messages = []
+
+    async def accept(self):
+        self.accepted = True
+
+    async def send_text(self, message):
+        if self.fail_send:
+            raise RuntimeError("socket closed")
+        self.messages.append(message)
+
+
+@pytest.mark.asyncio
+async def test_connection_manager_broadcasts_to_active_connections_and_removes_dead_ones():
+    manager = ConnectionManager()
+    active_socket = FakeWebSocket()
+    dead_socket = FakeWebSocket(fail_send=True)
+
+    await manager.connect(active_socket)
+    await manager.connect(dead_socket)
+    await manager.broadcast({"type": "ppr_updated", "id": 123})
+
+    assert active_socket.accepted is True
+    assert dead_socket.accepted is True
+    assert json.loads(active_socket.messages[0]) == {"type": "ppr_updated", "id": 123}
+    assert manager.active_connections == [active_socket]