Updated test case for gateway response and resolved ruff and flake8 issue

Signed-off-by: <Keval Mahajan> <[email protected]>

Author: kevalmahajan

mcpgateway/admin.py

@@ -763,7 +763,6 @@ async def admin_add_gateway(request: Request, db: Session = Depends(get_db), use
         auth_header_key=form.get("auth_header_key", ""),
         auth_header_value=form.get("auth_header_value", ""),
     )
-    root_path = request.scope.get("root_path", "")
     try:
         await gateway_service.register_gateway(db, gateway)
         return JSONResponse(
@@ -781,7 +780,6 @@ async def admin_add_gateway(request: Request, db: Session = Depends(get_db), use
         return JSONResponse(content={"message": str(ex), "success": False}, status_code=500)
 
 
-
 @admin_router.post("/gateways/{gateway_id}/edit")
 async def admin_edit_gateway(
     gateway_id: int,

tests/unit/mcpgateway/test_admin.py

@@ -561,7 +561,7 @@ async def test_admin_add_gateway(self, mock_register_gateway, mock_request, mock
 
         # Assert
         mock_register_gateway.assert_called_once()
-        assert isinstance(result, RedirectResponse) #JSONResponse
+        assert isinstance(result, JSONResponse) 
         assert result.status_code == 303
         assert "/admin#gateways" in result.headers["location"]