133 lines
3.1 KiB
JavaScript
133 lines
3.1 KiB
JavaScript
const memoizer = require('./..');
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const sinon = require('sinon');
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describe('lru-memoizer (events)', function () {
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let memoized;
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let onMiss, onHit, onQueue;
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beforeEach(function () {
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loadTimes = 0;
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onMiss = sinon.stub();
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onHit = sinon.stub();
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onQueue = sinon.stub();
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memoized = memoizer({
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load: function (a, b, bypass, callback) {
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return setTimeout(function () {
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if (a === 0) {
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return callback(new Error('a cant be 0'));
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}
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callback(null, a+b);
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}, 10);
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},
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hash: function (a, b) {
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return a + '-' + b;
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},
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bypass: function(a, b, bypass) {
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return bypass;
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},
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max: 10
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});
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memoized.on('hit', onHit);
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memoized.on('miss', onMiss);
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memoized.on('queue', onQueue);
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});
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describe('when the result is not in the cache', () => {
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beforeEach((done) => {
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memoized(1, 2, false, done);
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});
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it('should not call onHit', () => {
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sinon.assert.notCalled(onHit);
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});
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it('should not call onQueue', () => {
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sinon.assert.notCalled(onQueue);
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});
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it('should call onMiss with the load arguments', () => {
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sinon.assert.calledOnce(onMiss);
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sinon.assert.calledWith(onMiss, 1, 2, false);
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});
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});
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describe('when the result is in the cache', () => {
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beforeEach((done) => {
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memoized(1,2, false, () => {
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onHit.reset();
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onMiss.reset();
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onQueue.reset();
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memoized(1, 2, false, done);
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});
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});
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it('should call onHit with the load arguments', () => {
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sinon.assert.calledOnce(onHit);
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sinon.assert.calledWith(onHit, 1, 2, false);
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});
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it('should not call onQueue', () => {
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sinon.assert.notCalled(onQueue);
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});
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it('should not call onMiss', () => {
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sinon.assert.notCalled(onQueue);
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});
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});
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describe('when the cache is by passed', () => {
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beforeEach((done) => {
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memoized(1,2, false, () => {
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onHit.reset();
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onMiss.reset();
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onQueue.reset();
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memoized(1, 2, true, done);
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});
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});
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it('should not call onHit', () => {
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sinon.assert.notCalled(onHit);
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});
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it('should not call onQueue', () => {
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sinon.assert.notCalled(onQueue);
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});
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it('should call onMiss with the load arguments', () => {
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sinon.assert.calledOnce(onMiss);
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sinon.assert.calledWith(onMiss, 1, 2, true);
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});
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});
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describe('when the result is pending', () => {
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beforeEach((done) => {
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let pending = 2;
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function onDone() {
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pending -= 1;
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if (pending === 0) {
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done();
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}
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}
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memoized(1, 2, false, onDone);
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onHit.reset();
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onMiss.reset();
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onQueue.reset();
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memoized(1, 2, false, onDone);
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});
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it('should not call onHit', () => {
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sinon.assert.notCalled(onHit);
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});
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it('should call onQueue with the load arguments', () => {
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sinon.assert.calledOnce(onQueue);
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sinon.assert.calledWith(onQueue, 1, 2, false);
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});
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it('should not call onMiss', () => {
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sinon.assert.notCalled(onMiss);
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});
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});
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});
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