95 lines
3.3 KiB
TypeScript
95 lines
3.3 KiB
TypeScript
// (C) Copyright 2015 Moodle Pty Ltd.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import { AsyncInstance, asyncInstance } from '@/core/utils/async-instance';
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import { expectAnyType, expectSameTypes } from '@/testing/utils';
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describe('AsyncInstance', () => {
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it('initializes instances lazily', async () => {
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const asyncService = asyncInstance(() => new LazyService());
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expect(asyncService.instance).toBe(undefined);
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expect(await asyncService.hello()).toEqual('Hi there!');
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expect(asyncService.instance).toBeInstanceOf(LazyService);
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});
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it('does not initialize instance for eager properties', async () => {
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const asyncService = asyncInstance(() => new LazyService());
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asyncService.setEagerInstance(new EagerService());
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expect(asyncService.instance).toBeUndefined();
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expect(asyncService.answer).toEqual(42);
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expect(asyncService.instance).toBeUndefined();
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expect(await asyncService.hello()).toEqual('Hi there!');
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expect(asyncService.instance).toBeInstanceOf(LazyService);
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});
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it('preserves undefined properties after initialization', async () => {
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const asyncService = asyncInstance(() => new LazyService()) as { thisDoesNotExist?: () => Promise<void>};
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await expect(asyncService.thisDoesNotExist?.()).rejects.toBeInstanceOf(Error);
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expect(asyncService.thisDoesNotExist).toBeUndefined();
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});
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it('restricts types hierarchy', () => {
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type GetInstances<T> = T extends AsyncInstance<infer TLazyInstance, infer TEagerInstance>
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? { eager: TEagerInstance; lazy: TLazyInstance }
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: never;
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type GetEagerInstance<T> = GetInstances<T>['eager'];
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type GetLazyInstance<T> = GetInstances<T>['lazy'];
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expectSameTypes<GetLazyInstance<AsyncInstance<LazyService>>, LazyService>(true);
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expectSameTypes<GetEagerInstance<AsyncInstance<LazyService>>, Partial<LazyService>>(true);
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expectSameTypes<GetLazyInstance<AsyncInstance<LazyService, EagerService>>, LazyService>(true);
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expectSameTypes<GetEagerInstance<AsyncInstance<LazyService, EagerService>>, EagerService>(true);
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// @ts-expect-error LazyService should extend FakeEagerService.
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expectAnyType<AsyncInstance<LazyService, FakeEagerService>>();
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});
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it('makes methods asynchronous', () => {
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expectSameTypes<AsyncInstance<LazyService>['hello'], () => Promise<string>>(true);
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expectSameTypes<AsyncInstance<LazyService>['goodbye'], () => Promise<string>>(true);
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});
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});
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class EagerService {
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answer = 42;
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}
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class FakeEagerService {
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answer = '42';
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}
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class LazyService extends EagerService {
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hello(): string {
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return 'Hi there!';
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}
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async goodbye(): Promise<string> {
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return 'Sayonara!';
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}
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}
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