javascript-algorithms/src/data-structures/lru-cache/__test__/LRUCacheOnMap.test.js at master · reactapi/javascript-algorithms · GitHub

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importLRUCachefrom'../LRUCacheOnMap';

describe('LRUCacheOnMap',()=>{
it('should set and get values to and from the cache',()=>{
constcache=newLRUCache(100);
expect(cache.get('key-1')).toBeUndefined();

cache.set('key-1',15);
cache.set('key-2',16);
cache.set('key-3',17);
expect(cache.get('key-1')).toBe(15);
expect(cache.get('key-2')).toBe(16);
expect(cache.get('key-3')).toBe(17);
expect(cache.get('key-3')).toBe(17);
expect(cache.get('key-2')).toBe(16);
expect(cache.get('key-1')).toBe(15);

cache.set('key-1',5);
cache.set('key-2',6);
cache.set('key-3',7);
expect(cache.get('key-1')).toBe(5);
expect(cache.get('key-2')).toBe(6);
expect(cache.get('key-3')).toBe(7);
});

it('should evict least recently used items from cache with cache size of 1',()=>{
constcache=newLRUCache(1);
expect(cache.get('key-1')).toBeUndefined();

cache.set('key-1',15);
expect(cache.get('key-1')).toBe(15);

cache.set('key-2',16);
expect(cache.get('key-1')).toBeUndefined();
expect(cache.get('key-2')).toBe(16);

cache.set('key-2',17);
expect(cache.get('key-2')).toBe(17);

cache.set('key-3',18);
cache.set('key-4',19);
expect(cache.get('key-2')).toBeUndefined();
expect(cache.get('key-3')).toBeUndefined();
expect(cache.get('key-4')).toBe(19);
});

it('should evict least recently used items from cache with cache size of 2',()=>{
constcache=newLRUCache(2);
expect(cache.get('key-21')).toBeUndefined();

cache.set('key-21',15);
expect(cache.get('key-21')).toBe(15);

cache.set('key-22',16);
expect(cache.get('key-21')).toBe(15);
expect(cache.get('key-22')).toBe(16);

cache.set('key-22',17);
expect(cache.get('key-22')).toBe(17);

cache.set('key-23',18);
expect(cache.get('key-21')).toBeUndefined();
expect(cache.get('key-22')).toBe(17);
expect(cache.get('key-23')).toBe(18);

cache.set('key-24',19);
expect(cache.get('key-21')).toBeUndefined();
expect(cache.get('key-22')).toBeUndefined();
expect(cache.get('key-23')).toBe(18);
expect(cache.get('key-24')).toBe(19);
});

it('should evict least recently used items from cache with cache size of 3',()=>{
constcache=newLRUCache(3);

cache.set('key-1',1);
cache.set('key-2',2);
cache.set('key-3',3);
expect(cache.get('key-1')).toBe(1);
expect(cache.get('key-2')).toBe(2);
expect(cache.get('key-3')).toBe(3);

cache.set('key-3',4);
expect(cache.get('key-1')).toBe(1);
expect(cache.get('key-2')).toBe(2);
expect(cache.get('key-3')).toBe(4);

cache.set('key-4',5);
expect(cache.get('key-1')).toBeUndefined();
expect(cache.get('key-2')).toBe(2);
expect(cache.get('key-3')).toBe(4);
expect(cache.get('key-4')).toBe(5);
});

it('should promote the node while calling set() method',()=>{
constcache=newLRUCache(2);

cache.set('2',1);
cache.set('1',1);
cache.set('2',3);
cache.set('4',1);
expect(cache.get('1')).toBeUndefined();
expect(cache.get('2')).toBe(3);
});

it('should promote the recently accessed item with cache size of 3',()=>{
constcache=newLRUCache(3);

cache.set('key-1',1);
cache.set('key-2',2);
cache.set('key-3',3);
expect(cache.get('key-1')).toBe(1);

cache.set('key-4',4);
expect(cache.get('key-1')).toBe(1);
expect(cache.get('key-3')).toBe(3);
expect(cache.get('key-4')).toBe(4);
expect(cache.get('key-2')).toBeUndefined();
});

it('should promote the recently accessed item with cache size of 4',()=>{
constcache=newLRUCache(4);

cache.set('key-1',1);
cache.set('key-2',2);
cache.set('key-3',3);
cache.set('key-4',4);
expect(cache.get('key-4')).toBe(4);
expect(cache.get('key-3')).toBe(3);
expect(cache.get('key-2')).toBe(2);
expect(cache.get('key-1')).toBe(1);

cache.set('key-5',5);
expect(cache.get('key-1')).toBe(1);
expect(cache.get('key-2')).toBe(2);
expect(cache.get('key-3')).toBe(3);
expect(cache.get('key-4')).toBeUndefined();
expect(cache.get('key-5')).toBe(5);

cache.set('key-6',6);
expect(cache.get('key-1')).toBeUndefined();
expect(cache.get('key-2')).toBe(2);
expect(cache.get('key-3')).toBe(3);
expect(cache.get('key-4')).toBeUndefined();
expect(cache.get('key-5')).toBe(5);
expect(cache.get('key-6')).toBe(6);
});
});