@gleaner/tracker/__tests__/cache.js

A JavaScript tracking library with ecommerce support

import Cache from '../src/cache';

beforeEach(() => {
  localStorage.clear();
});

function storageSize() {
	return Object.keys(localStorage.__STORE__).length;
}

describe("Cache", () => {

	const CACHE_NAME = "test";

	let c = new Cache(CACHE_NAME);

	describe("#add", () => {

		const event = {
			ts: 123
		}

		const keyName = CACHE_NAME + event.ts;
		const expected = JSON.stringify(event);

		test("should set item in storage under keyName of concatenated cache name and key", () => {
			c.add(event.ts, event)
			expect(localStorage.setItem).toHaveBeenLastCalledWith(keyName, expected);
			expect(localStorage.__STORE__[keyName]).toBe(expected);
			expect(storageSize()).toBe(2);
		})

		test("should register keyName as used", () => {
			expect(c.keys[keyName]).toBeDefined()
		})
	})


	describe("#delete", () => {

		const KEY = "123"

		test("should register keyName as used", () => {
			expect(c.keys[CACHE_NAME + KEY]).toBeDefined()
		})

		test("should remove item", () => {
			c.delete(KEY)
			expect(c.keys[CACHE_NAME + KEY]).toBe(undefined)
		})

	})

	describe("#getAll", () => {
		
		test("should return array of values", () => {
			c.add("1", 1)
			c.add("2", 2)
			let arr = c.getAll()
			expect(arr).toEqual([1, 2])
		})

	})

	describe("#deleteAll", () => {
		test("should cleanup the cache", () => {
			c.add("1", 1)
			c.add("2", 2)
			c.deleteAll()
			expect(storageSize()).toBe(0);
			expect(c.keys).toEqual({})
		})

	})

})