79 lines
2.3 KiB
TypeScript
79 lines
2.3 KiB
TypeScript
import { createLimitedCache } from '../cache';
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describe('createCache', () => {
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test('returns expected methods', () => {
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const actual = createLimitedCache();
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expect(actual).toBeTypeOf('object');
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expect(actual).toHaveProperty('get');
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expect(actual).toHaveProperty('has');
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expect(actual).toHaveProperty('delete');
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expect(actual).toHaveProperty('set');
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});
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test('caches values provided to it', () => {
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const cache = createLimitedCache();
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cache.set('test', 'result');
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expect(cache.get('test')).toBe('result');
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});
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test('has returns expected values', () => {
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const cache = createLimitedCache();
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cache.set('test', 'result');
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expect(cache.has('test')).toBeTruthy();
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expect(cache.has('not found')).toBeFalsy();
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});
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test('updates a value if keys are the same', () => {
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const cache = createLimitedCache();
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cache.set('test1', 1);
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cache.set('test1', 2);
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expect(cache.get('test1')).toBe(2);
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});
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test('delete removes an item', () => {
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const cache = createLimitedCache();
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cache.set('test', 'result');
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expect(cache.has('test')).toBeTruthy();
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cache.delete('test');
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expect(cache.has('test')).toBeFalsy();
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expect(cache.get('test')).toBeUndefined();
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});
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test('removes oldest item cached if it exceeds a set size', () => {
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const cache = createLimitedCache({ maxSize: 1 });
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cache.set('test1', 1);
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cache.set('test2', 2);
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expect(cache.get('test1')).toBeUndefined();
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expect(cache.get('test2')).toBe(2);
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});
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test('retrieving a value bumps up last access', () => {
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const cache = createLimitedCache({ maxSize: 2 });
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cache.set('test1', 1);
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cache.set('test2', 2);
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expect(cache.get('test1')).toBe(1);
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cache.set('test3', 3);
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expect(cache.get('test1')).toBe(1);
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expect(cache.get('test2')).toBeUndefined();
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expect(cache.get('test3')).toBe(3);
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});
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test('logs when cache is added to and removed', () => {
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const log = vi.fn();
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const cache = createLimitedCache({ maxSize: 1, log });
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cache.set('test1', 1);
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expect(log).toHaveBeenLastCalledWith(
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'Added %s to cache, now size %d',
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'test1',
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1,
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);
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cache.set('test2', 1);
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expect(log).toHaveBeenLastCalledWith(
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'Added %s and deleted %s from cache, now size %d',
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'test2',
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'test1',
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1,
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);
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});
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});
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