test: rename variables and format multiline assertion in events gateway spec

- Renamed `jwtService` to `_jwtService` to align with conventions for unused test variables.
- Adjusted multiline assertion formatting for improved readability.

backend/src/realtime/events.gateway.spec.ts

@@ -1,12 +1,11 @@
 import { ConfigService } from "@nestjs/config";
 import { Test, TestingModule } from "@nestjs/testing";
-import { Server } from "socket.io";
 import { JwtService } from "../crypto/services/jwt.service";
 import { EventsGateway } from "./events.gateway";
 
 describe("EventsGateway", () => {
 	let gateway: EventsGateway;
-	let jwtService: JwtService;
+	let _jwtService: JwtService;
 
 	const mockJwtService = {
 		verifyJwt: jest.fn(),
@@ -26,7 +25,7 @@ describe("EventsGateway", () => {
 		}).compile();
 
 		gateway = module.get<EventsGateway>(EventsGateway);
-		jwtService = module.get<JwtService>(JwtService);
+		_jwtService = module.get<JwtService>(JwtService);
 		gateway.server = {
 			to: jest.fn().mockReturnThis(),
 			emit: jest.fn(),
@@ -46,7 +45,10 @@ describe("EventsGateway", () => {
 			gateway.sendToUser(userId, event, data);
 
 			expect(gateway.server.to).toHaveBeenCalledWith(`user:${userId}`);
-			expect(gateway.server.to(`user:${userId}`).emit).toHaveBeenCalledWith(event, data);
+			expect(gateway.server.to(`user:${userId}`).emit).toHaveBeenCalledWith(
+				event,
+				data,
+			);
 		});
 	});
 });