mirror of https://github.com/webpack/webpack.git
67 lines
2.0 KiB
JavaScript
67 lines
2.0 KiB
JavaScript
"use strict";
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const Cache = require("../lib/Cache");
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const { ItemCacheFacade, MultiItemCache } = require("../lib/CacheFacade");
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describe("MultiItemCache", () => {
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it("Throws when getting items from an empty Cache", () => {
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const multiItemCache = new MultiItemCache(generateItemCaches(0));
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expect(() => multiItemCache.get(_ => _())).toThrow();
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});
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it("Returns the single ItemCacheFacade when passed an array of length 1", () => {
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const itemCaches = generateItemCaches(1);
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const multiItemCache = new MultiItemCache(itemCaches);
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expect(multiItemCache).toBe(itemCaches[0]);
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});
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it("Retrieves items from the underlying Cache when get is called", () => {
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const itemCaches = generateItemCaches(10);
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const multiItemCache = new MultiItemCache(itemCaches);
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const callback = (err, res) => {
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expect(err).toBeNull();
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expect(res).toBeInstanceOf(Object);
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};
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for (let i = 0; i < 10; ++i) {
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multiItemCache.get(callback);
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}
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});
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it("Can get() a large number of items without exhausting the stack", () => {
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const itemCaches = generateItemCaches(10000, () => undefined);
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const multiItemCache = new MultiItemCache(itemCaches);
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let callbacks = 0;
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const callback = (err, res) => {
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expect(err).toBeNull();
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expect(res).toBeUndefined();
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++callbacks;
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};
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multiItemCache.get(callback);
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expect(callbacks).toEqual(1);
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});
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/**
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* @param {number} howMany how many generation
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* @param {() => EXPECTED_ANY=} dataGenerator data generator fn
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* @returns {EXPECTED_ANY[]} cache facades
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*/
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function generateItemCaches(howMany, dataGenerator) {
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const ret = [];
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for (let i = 0; i < howMany; ++i) {
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const name = `ItemCache${i}`;
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const tag = `ItemTag${i}`;
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const dataGen = dataGenerator || (() => ({ name: tag }));
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const cache = new Cache();
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cache.hooks.get.tapAsync(
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"DataReturner",
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(_identifier, _etag, _gotHandlers, callback) => {
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callback(undefined, dataGen());
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}
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);
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const itemCache = new ItemCacheFacade(cache, name, tag);
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ret[i] = itemCache;
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}
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return ret;
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}
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});
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