refactor: Enable stricter test linting

test/unit/server/WebSocketServerConfigurator.test.ts

@@ -34,9 +34,10 @@ describe('A WebSocketServerConfigurator', (): void => {
     // Clearing the logger mock
     jest.clearAllMocks();
     server = new EventEmitter() as any;
-    webSocket = new EventEmitter() as any;
-    webSocket.send = jest.fn();
-    webSocket.close = jest.fn();
+    webSocket = {
+      send: jest.fn(),
+      close: jest.fn(),
+    } as any;
 
     upgradeRequest = new EventEmitter() as any;
 

test/unit/server/middleware/StaticAssetHandler.test.ts

@@ -222,7 +222,8 @@ describe('A StaticAssetHandler', (): void => {
   it('does not handle a request to a known folder URL with parent path segments.', async(): Promise<void> => {
     const request = { method: 'GET', url: '/foo/bar/folder/../def.css' };
     const response = createResponse({ eventEmitter: EventEmitter });
-    await expect(handler.canHandle({ request, response } as any)).rejects.toThrow();
+    await expect(handler.canHandle({ request, response } as any))
+      .rejects.toThrow('No static resource configured at /foo/bar/folder/../def.css');
   });
 
   it('caches responses when the expires option is set.', async(): Promise<void> => {

test/unit/server/notifications/WebSocketChannel2023/WebSocket2023Emitter.test.ts

@@ -1,4 +1,3 @@
-import { EventEmitter } from 'events';
 import type { WebSocket } from 'ws';
 import { BasicRepresentation } from '../../../../../src/http/representation/BasicRepresentation';
 import type { NotificationChannel } from '../../../../../src/server/notifications/NotificationChannel';
@@ -20,9 +19,10 @@ describe('A WebSocket2023Emitter', (): void => {
   let emitter: WebSocket2023Emitter;
 
   beforeEach(async(): Promise<void> => {
-    webSocket = new EventEmitter() as any;
-    webSocket.send = jest.fn();
-    webSocket.close = jest.fn();
+    webSocket = {
+      send: jest.fn(),
+      close: jest.fn(),
+    } as any;
 
     socketMap = new WrappedSetMultiMap();
 
@@ -46,8 +46,9 @@ describe('A WebSocket2023Emitter', (): void => {
   });
 
   it('can send to multiple matching WebSockets.', async(): Promise<void> => {
-    const webSocket2: jest.Mocked<WebSocket> = new EventEmitter() as any;
-    webSocket2.send = jest.fn();
+    const webSocket2: jest.Mocked<WebSocket> = {
+      send: jest.fn(),
+    } as any;
 
     socketMap.add(channel.id, webSocket);
     socketMap.add(channel.id, webSocket2);
@@ -61,8 +62,9 @@ describe('A WebSocket2023Emitter', (): void => {
   });
 
   it('only sends to the matching WebSockets.', async(): Promise<void> => {
-    const webSocket2: jest.Mocked<WebSocket> = new EventEmitter() as any;
-    webSocket2.send = jest.fn();
+    const webSocket2: jest.Mocked<WebSocket> = {
+      send: jest.fn(),
+    } as any;
     const channel2: NotificationChannel = {
       ...channel,
       id: 'other',

test/unit/server/notifications/WebSocketChannel2023/WebSocket2023Listener.test.ts

@@ -1,4 +1,3 @@
-import { EventEmitter } from 'events';
 import type { WebSocket } from 'ws';
 
 import type { HttpRequest } from '../../../../../src/server/HttpRequest';
@@ -36,9 +35,10 @@ describe('A WebSocket2023Listener', (): void => {
   let listener: WebSocket2023Listener;
 
   beforeEach(async(): Promise<void> => {
-    webSocket = new EventEmitter() as any;
-    webSocket.send = jest.fn();
-    webSocket.close = jest.fn();
+    webSocket = {
+      send: jest.fn(),
+      close: jest.fn(),
+    } as any;
 
     upgradeRequest = { url: `/foo/123456` } as any;
 

test/unit/server/notifications/WebSocketChannel2023/WebSocket2023Storer.test.ts

@@ -12,6 +12,7 @@ import type { SetMultiMap } from '../../../../../src/util/map/SetMultiMap';
 import { WrappedSetMultiMap } from '../../../../../src/util/map/WrappedSetMultiMap';
 import { flushPromises } from '../../../../util/Util';
 
+/* eslint-disable jest/prefer-spy-on */
 describe('A WebSocket2023Storer', (): void => {
   const channel: NotificationChannel = {
     id: 'id',