async_test.ts•1.04 kB
/**
* Copyright 2024 Google LLC
*
* 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 * as assert from 'assert';
import { describe, it } from 'node:test';
import { LazyPromise } from '../src/async';
describe('LazyPromise', () => {
it('call its function lazily', async () => {
let called = false;
const lazy = new LazyPromise((resolver) => {
called = true;
resolver('foo');
});
assert.ok(!called);
const result = await lazy;
assert.ok(called);
assert.equal(result, 'foo');
});
});