| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 { cacheWrapper } from 'src/utils/cacheWrapper'; |
| |
| describe('cacheWrapper', () => { |
| const fnResult = 'fnResult'; |
| const fn = jest.fn<string, [number, number]>().mockReturnValue(fnResult); |
| |
| let wrappedFn: (a: number, b: number) => string; |
| |
| beforeEach(() => { |
| const cache = new Map<string, any>(); |
| wrappedFn = cacheWrapper(fn, cache); |
| }); |
| |
| afterEach(() => { |
| jest.clearAllMocks(); |
| }); |
| |
| it('calls fn with its arguments once when the key is not found', () => { |
| const returnedValue = wrappedFn(1, 2); |
| |
| expect(returnedValue).toEqual(fnResult); |
| expect(fn).toBeCalledTimes(1); |
| expect(fn).toBeCalledWith(1, 2); |
| }); |
| |
| describe('subsequent calls', () => { |
| it('returns the correct value without fn being called multiple times', () => { |
| const returnedValue1 = wrappedFn(1, 2); |
| const returnedValue2 = wrappedFn(1, 2); |
| |
| expect(returnedValue1).toEqual(fnResult); |
| expect(returnedValue2).toEqual(fnResult); |
| expect(fn).toBeCalledTimes(1); |
| }); |
| |
| it('fn is called multiple times for different arguments', () => { |
| wrappedFn(1, 2); |
| wrappedFn(1, 3); |
| |
| expect(fn).toBeCalledTimes(2); |
| }); |
| }); |
| |
| describe('with custom keyFn', () => { |
| let cache: Map<string, any>; |
| |
| beforeEach(() => { |
| cache = new Map<string, any>(); |
| wrappedFn = cacheWrapper(fn, cache, (...args) => `key-${args[0]}`); |
| }); |
| |
| it('saves fn result in cache under generated key', () => { |
| wrappedFn(1, 2); |
| expect(cache.get('key-1')).toEqual(fnResult); |
| }); |
| |
| it('subsequent calls with same generated key calls fn once, even if other arguments have changed', () => { |
| wrappedFn(1, 1); |
| wrappedFn(1, 2); |
| wrappedFn(1, 3); |
| |
| expect(fn).toBeCalledTimes(1); |
| }); |
| }); |
| }); |