update test helpers to consolidate ServerContext creation into one method

test/testHelpers/apolloTestServerHelpers.ts

@@ -4,6 +4,7 @@ import { MergedResolvers } from "../../src/MergedResolvers";
 import { UnoptimizedInMemoryRepository } from "../../src/repositories/UnoptimizedInMemoryRepository";
 import { beforeEach } from "@jest/globals";
 import { ServerContext } from "../../src/ServerContext";
+import { NotificationService } from "../../src/services/NotificationService";
 
 
 function setUpTestServer() {
@@ -17,14 +18,28 @@ function setUpTestServer() {
 }
 
 export function setupTestServerContext() {
-  // @ts-ignore
-  const context: { testServer: ApolloServer<ServerContext>; repository: UnoptimizedInMemoryRepository } = {};
+  const context: { [key: string] : any } = {};
 
   beforeEach(() => {
-    context.testServer = setUpTestServer();
     context.repository = new UnoptimizedInMemoryRepository();
+    context.notificationService = new NotificationService(context.repository);
   });
 
-  // Return a reference, not destructured values
-  return context;
-}
+  return context as ServerContext;
+}
+
+/**
+ * Returns an object which holds a test server.
+ * This server is reset before every test.
+ * Tests should keep a reference to the holder object,
+ * and not destructure it.
+ */
+export function setupTestServerHolder() {
+  const holder: { [key: string]: any } = {};
+
+  beforeEach(() => {
+    holder.testServer = setUpTestServer();
+  });
+
+  return holder as { testServer: ApolloServer };
+}