reference correct system which is rebuilt every test

test/resolvers/StopResolverTests.test.ts

@@ -1,7 +1,10 @@
 import { beforeEach, describe, expect, it } from "@jest/globals";
-import { setupTestServerContext, setupTestServerHolder } from "../testHelpers/apolloTestServerHelpers";
+import {
+  setupTestServerContext,
+  setupTestServerHolder
+} from "../testHelpers/apolloTestServerHelpers";
 import { generateMockEtas, generateMockOrderedStops } from "../testHelpers/mockDataGenerators";
-import { IStop, IPassioSystem } from "../../src/entities/entities";
+import { IStop } from "../../src/entities/entities";
 import { addMockStopToRepository } from "../testHelpers/repositorySetupHelpers";
 import assert = require("node:assert");
 
@@ -10,18 +13,16 @@ describe("StopResolvers", () => {
   const context = setupTestServerContext();
 
   let mockStop: IStop;
-  let mockSystem: IPassioSystem;
 
   beforeEach(async () => {
-    mockSystem = context.systems[0];
-    mockStop = await addMockStopToRepository(context.systems[0].shuttleRepository, mockSystem.id);
+    mockStop = await addMockStopToRepository(context.systems[0].shuttleRepository, context.systems[0].id);
   })
 
   async function getResponseForQuery(query: string) {
     return await holder.testServer.executeOperation({
       query,
       variables: {
-        systemId: mockSystem.id,
+        systemId: context.systems[0].id,
         stopId: mockStop.id,
       },
     }, {