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- import { fetchWithCache, disableCache, enableCache, clearCache } from '../src/cache';
- import fetch, { Response } from 'node-fetch';
- jest.mock('node-fetch');
- const mockedFetch = fetch as jest.MockedFunction<typeof fetch>;
- const mockedFetchResponse = (ok: boolean, response: object) => {
- return {
- ok,
- text: () => Promise.resolve(JSON.stringify(response)),
- headers: {
- get: (name: string) => {
- if (name === 'content-type') {
- return 'application/json';
- }
- return null;
- },
- },
- } as unknown as Response;
- };
- describe('fetchWithCache', () => {
- afterEach(() => {
- mockedFetch.mockReset();
- });
- it('should not cache data with failed request', async () => {
- enableCache();
- const url = 'https://api.example.com/data';
- const response = { data: 'test data' };
- mockedFetch.mockResolvedValueOnce(mockedFetchResponse(false, response));
- const result = await fetchWithCache(url, {}, 1000);
- expect(mockedFetch).toHaveBeenCalledTimes(1);
- expect(result).toEqual({ cached: false, data: response });
- });
- it('should fetch data with cache enabled', async () => {
- enableCache();
- const url = 'https://api.example.com/data';
- const response = { data: 'test data' };
- mockedFetch.mockResolvedValueOnce(mockedFetchResponse(true, response));
- const result = await fetchWithCache(url, {}, 1000);
- expect(mockedFetch).toHaveBeenCalledTimes(1);
- expect(result).toEqual({ cached: false, data: response });
- });
- it('should fetch data with cache enabled after previous test', async () => {
- const url = 'https://api.example.com/data';
- const response = { data: 'test data' };
- mockedFetch.mockResolvedValueOnce(mockedFetchResponse(true, response));
- const result = await fetchWithCache(url, {}, 1000);
- expect(mockedFetch).toHaveBeenCalledTimes(0);
- expect(result).toEqual({ cached: true, data: response });
- });
- it('should only fetch data once with cache enabled', async () => {
- enableCache();
- clearCache();
- const url = 'https://api.example.com/data';
- const response = { data: 'test data' };
- mockedFetch.mockResolvedValueOnce(mockedFetchResponse(true, response));
- mockedFetch.mockRejectedValue(new Error('Should not be called'));
- const [a, b] = await Promise.all([
- fetchWithCache(url, {}, 1000),
- fetchWithCache(url, {}, 1000),
- ]);
- expect(mockedFetch).toHaveBeenCalledTimes(1);
- expect(a).toEqual({ cached: false, data: response });
- expect(b).toEqual({ cached: true, data: response });
- });
- it('should fetch data without cache for a single test', async () => {
- disableCache();
- const url = 'https://api.example.com/data';
- const response = { data: 'test data' };
- mockedFetch.mockResolvedValueOnce(mockedFetchResponse(true, response));
- const result = await fetchWithCache(url, {}, 1000);
- expect(mockedFetch).toHaveBeenCalledTimes(1);
- expect(result).toEqual({ cached: false, data: response });
- enableCache();
- });
- it('should still fetch data without cache for a single test', async () => {
- disableCache();
- const url = 'https://api.example.com/data';
- const response = { data: 'test data' };
- mockedFetch.mockResolvedValueOnce(mockedFetchResponse(true, response));
- const result = await fetchWithCache(url, {}, 1000);
- expect(mockedFetch).toHaveBeenCalledTimes(1);
- expect(result).toEqual({ cached: false, data: response });
- enableCache();
- });
- });
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