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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { DebounceLoader } from '@/misc/loader.js';
class Mock {
loadCountByKey = new Map<number, number>();
load = async (key: number): Promise<number> => {
const count = this.loadCountByKey.get(key);
if (typeof count === 'undefined') {
this.loadCountByKey.set(key, 1);
} else {
this.loadCountByKey.set(key, count + 1);
}
return key * 2;
};
reset() {
this.loadCountByKey.clear();
}
}
describe(DebounceLoader, () => {
describe('single request', () => {
it('loads once', async () => {
const mock = new Mock();
const loader = new DebounceLoader(mock.load);
expect(await loader.load(7)).toBe(14);
expect(mock.loadCountByKey.size).toBe(1);
expect(mock.loadCountByKey.get(7)).toBe(1);
});
});
describe('two duplicated requests at same time', () => {
it('loads once', async () => {
const mock = new Mock();
const loader = new DebounceLoader(mock.load);
const [v1, v2] = await Promise.all([
loader.load(7),
loader.load(7),
]);
expect(v1).toBe(14);
expect(v2).toBe(14);
expect(mock.loadCountByKey.size).toBe(1);
expect(mock.loadCountByKey.get(7)).toBe(1);
});
});
describe('two different requests at same time', () => {
it('loads twice', async () => {
const mock = new Mock();
const loader = new DebounceLoader(mock.load);
const [v1, v2] = await Promise.all([
loader.load(7),
loader.load(13),
]);
expect(v1).toBe(14);
expect(v2).toBe(26);
expect(mock.loadCountByKey.size).toBe(2);
expect(mock.loadCountByKey.get(7)).toBe(1);
expect(mock.loadCountByKey.get(13)).toBe(1);
});
});
describe('non-continuous same two requests', () => {
it('loads twice', async () => {
const mock = new Mock();
const loader = new DebounceLoader(mock.load);
expect(await loader.load(7)).toBe(14);
expect(mock.loadCountByKey.size).toBe(1);
expect(mock.loadCountByKey.get(7)).toBe(1);
mock.reset();
expect(await loader.load(7)).toBe(14);
expect(mock.loadCountByKey.size).toBe(1);
expect(mock.loadCountByKey.get(7)).toBe(1);
});
});
describe('non-continuous different two requests', () => {
it('loads twice', async () => {
const mock = new Mock();
const loader = new DebounceLoader(mock.load);
expect(await loader.load(7)).toBe(14);
expect(mock.loadCountByKey.size).toBe(1);
expect(mock.loadCountByKey.get(7)).toBe(1);
mock.reset();
expect(await loader.load(13)).toBe(26);
expect(mock.loadCountByKey.size).toBe(1);
expect(mock.loadCountByKey.get(13)).toBe(1);
});
});
});
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