@sanjo/cache/Cache.spec.js

Caches

import { describe, it, expect } from '@jest/globals';
import { Cache, FAILED_TO_RETRIEVE_VALUE_ERROR_MESSAGE } from './Cache';
describe('Cache', () => {
    describe('has', () => {
        describe('when the cache has a value for the key', () => {
            it('returns true', () => {
                const cache = new Cache();
                const key = 1;
                cache.set(key, {});
                expect(cache.has(key)).toEqual(true);
            });
        });
        describe('when the cache has no value for the key', () => {
            it('returns false', () => {
                const cache = new Cache();
                const key = 1;
                expect(cache.has(key)).toEqual(false);
            });
        });
    });
    describe('retrieve', () => {
        describe('when the cache has a value for the key', () => {
            it('returns the value', () => {
                const cache = new Cache();
                const key = 1;
                const value = {};
                cache.set(key, value);
                expect(cache.retrieve(key)).toBe(value);
            });
        });
        describe('when the cache has no value for the key', () => {
            it('throws the error "Failed to retrieve value."', () => {
                const cache = new Cache();
                const key = 1;
                expect(() => cache.retrieve(key)).toThrowError(FAILED_TO_RETRIEVE_VALUE_ERROR_MESSAGE);
            });
        });
    });
});
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