Replace MockPromise with existing createDeferred

Signed-off-by: Jacob Raihle kdm951 <jacob.raihle@teliacompany.com>

plugins/catalog-react/src/hooks/useEntityListProvider.test.tsx

@@ -40,7 +40,7 @@ import {
   EntityTypeFilter,
   EntityUserFilter,
 } from '../filters';
-import { MockPromise } from '../testUtils/MockPromise';
+import { createDeferred } from '@backstage/types';
 import { EntityListPagination } from '../types';
 import { EntityListProvider, useEntityList } from './useEntityListProvider';
 
@@ -349,8 +349,8 @@ describe('<EntityListProvider />', () => {
       wrapper: createWrapper({ pagination }),
     });
 
-    const firstResult = new MockPromise<GetEntitiesResponse>();
-    const secondResult = new MockPromise<GetEntitiesResponse>();
+    const firstResult = createDeferred<GetEntitiesResponse>();
+    const secondResult = createDeferred<GetEntitiesResponse>();
 
     await waitFor(() => {
       expect(result.current.backendEntities.length).toBeGreaterThan(0);

plugins/catalog-react/src/testUtils/MockPromise.test.ts

@@ -1,31 +0,0 @@
-/*
- * Copyright 2025 The Backstage Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import { MockPromise } from './MockPromise.ts';
-
-describe('MockPromise', () => {
-  it('is resolved when its resolve function is called', async () => {
-    const p = new MockPromise<number>();
-    p.resolve(12);
-    return expect(p).resolves.toBe(12);
-  });
-
-  it('is rejected when its reject function is called', async () => {
-    const p = new MockPromise();
-    p.reject('Test rejection');
-    return expect(p).rejects.toMatch('Test rejection');
-  });
-});

plugins/catalog-react/src/testUtils/MockPromise.ts

@@ -1,47 +0,0 @@
-/*
- * Copyright 2025 The Backstage Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-type ResolveFn<T> = (value: T | PromiseLike<T>) => void;
-type RejectFn = (reason?: any) => void;
-type Executor<T> = (resolve: ResolveFn<T>, reject: RejectFn) => void;
-
-export class MockPromise<T> extends Promise<T> {
-  private _resolve!: ResolveFn<T>;
-  private _reject!: RejectFn;
-
-  constructor(executor?: Executor<T>) {
-    if (executor !== undefined) {
-      super(executor);
-      return;
-    }
-
-    let res: ResolveFn<T>;
-    let rej: RejectFn;
-    super((resolve, reject) => {
-      res = resolve;
-      rej = reject;
-    });
-    this._resolve = res!;
-    this._reject = rej!;
-  }
-
-  get resolve() {
-    return this._resolve;
-  }
-
-  get reject() {
-    return this._reject;
-  }
-}