115 lines
4.0 KiB
TypeScript
115 lines
4.0 KiB
TypeScript
/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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import { Singleflight } from "../../src/utils/Singleflight";
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describe("Singleflight", () => {
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afterEach(() => {
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Singleflight.forgetAll();
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});
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it("should throw for bad context variables", () => {
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const permutations: [Object, string][] = [
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[null, null],
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[{}, null],
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[null, "test"],
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];
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for (const p of permutations) {
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try {
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Singleflight.for(p[0], p[1]);
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// noinspection ExceptionCaughtLocallyJS
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throw new Error("failed to fail: " + JSON.stringify(p));
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} catch (e) {
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expect(e.message).toBe("An instance and key must be supplied");
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}
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}
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});
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it("should execute the function once", () => {
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const instance = {};
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const key = "test";
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const val = {}; // unique object for reference check
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const fn = jest.fn().mockReturnValue(val);
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const sf = Singleflight.for(instance, key);
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const r1 = sf.do(fn);
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expect(r1).toBe(val);
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expect(fn.mock.calls.length).toBe(1);
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const r2 = sf.do(fn);
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expect(r2).toBe(val);
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expect(fn.mock.calls.length).toBe(1);
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});
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it("should execute the function once, even with new contexts", () => {
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const instance = {};
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const key = "test";
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const val = {}; // unique object for reference check
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const fn = jest.fn().mockReturnValue(val);
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let sf = Singleflight.for(instance, key);
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const r1 = sf.do(fn);
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expect(r1).toBe(val);
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expect(fn.mock.calls.length).toBe(1);
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sf = Singleflight.for(instance, key); // RESET FOR TEST
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const r2 = sf.do(fn);
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expect(r2).toBe(val);
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expect(fn.mock.calls.length).toBe(1);
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});
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it("should execute the function twice if the result was forgotten", () => {
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const instance = {};
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const key = "test";
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const val = {}; // unique object for reference check
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const fn = jest.fn().mockReturnValue(val);
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const sf = Singleflight.for(instance, key);
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const r1 = sf.do(fn);
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expect(r1).toBe(val);
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expect(fn.mock.calls.length).toBe(1);
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sf.forget();
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const r2 = sf.do(fn);
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expect(r2).toBe(val);
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expect(fn.mock.calls.length).toBe(2);
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});
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it("should execute the function twice if the instance was forgotten", () => {
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const instance = {};
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const key = "test";
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const val = {}; // unique object for reference check
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const fn = jest.fn().mockReturnValue(val);
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const sf = Singleflight.for(instance, key);
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const r1 = sf.do(fn);
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expect(r1).toBe(val);
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expect(fn.mock.calls.length).toBe(1);
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Singleflight.forgetAllFor(instance);
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const r2 = sf.do(fn);
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expect(r2).toBe(val);
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expect(fn.mock.calls.length).toBe(2);
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});
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it("should execute the function twice if everything was forgotten", () => {
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const instance = {};
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const key = "test";
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const val = {}; // unique object for reference check
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const fn = jest.fn().mockReturnValue(val);
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const sf = Singleflight.for(instance, key);
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const r1 = sf.do(fn);
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expect(r1).toBe(val);
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expect(fn.mock.calls.length).toBe(1);
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Singleflight.forgetAll();
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const r2 = sf.do(fn);
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expect(r2).toBe(val);
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expect(fn.mock.calls.length).toBe(2);
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});
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});
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