forked from xtermjs/xterm.js
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LRUMap.test.ts
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LRUMap.test.ts
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/**
* Copyright (c) 2017 The xterm.js authors. All rights reserved.
* @license MIT
*/
import { assert } from 'chai';
import LRUMap from './LRUMap';
describe('LRUMap', () => {
it('can be used to store and retrieve values', () => {
const map = new LRUMap(10);
map.set(1, 'valuea');
map.set(2, 'valueb');
map.set(3, 'valuec');
assert.strictEqual(map.get(1), 'valuea');
assert.strictEqual(map.get(2), 'valueb');
assert.strictEqual(map.get(3), 'valuec');
});
it('maintains a size from insertions', () => {
const map = new LRUMap(10);
assert.strictEqual(map.size, 0);
map.set(1, 'value');
assert.strictEqual(map.size, 1);
map.set(2, 'value');
assert.strictEqual(map.size, 2);
});
it('deletes the oldest entry when the capacity is exceeded', () => {
const map = new LRUMap(4);
map.set(1, 'value');
map.set(2, 'value');
map.set(3, 'value');
map.set(4, 'value');
map.set(5, 'value');
assert.isNull(map.get(1));
assert.isNotNull(map.get(2));
assert.isNotNull(map.get(3));
assert.isNotNull(map.get(4));
assert.isNotNull(map.get(5));
assert.strictEqual(map.size, 4);
});
it('prevents a recently accessed entry from getting deleted', () => {
const map = new LRUMap(2);
map.set(1, 'value');
map.set(2, 'value');
map.get(1);
// a would normally get deleted here, except that we called get()
map.set(3, 'value');
assert.isNotNull(map.get(1));
// b got deleted instead of a
assert.isNull(map.get(2));
assert.isNotNull(map.get(3));
});
it('supports mutation', () => {
const map = new LRUMap(10);
map.set(1, 'oldvalue');
map.set(1, 'newvalue');
// mutation doesn't change the size
assert.strictEqual(map.size, 1);
assert.strictEqual(map.get(1), 'newvalue');
});
});