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68 lines
2.2 KiB
68 lines
2.2 KiB
2 years ago
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var vows = require('vows');
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var assert = require('assert');
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var TIMING_EPSILON = 10;
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var TokenBucket = require('../lib/tokenBucket');
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vows.describe('TokenBucket').addBatch({
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'capacity 10, 1 per 100ms': {
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topic: new TokenBucket(10, 1, 100),
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'is initialized empty': function(bucket) {
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assert.equal(bucket.bucketSize, 10);
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assert.equal(bucket.tokensPerInterval, 1);
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assert.equal(bucket.content, 0);
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},
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'removing 10 tokens': {
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topic: function(bucket) {
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this.gStart = +new Date();
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bucket.removeTokens(10, this.callback);
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},
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'takes 1 second': function(remainingTokens) {
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var duration = +new Date() - this.gStart;
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var diff = Math.abs(1000 - duration);
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assert.ok(diff < TIMING_EPSILON, diff+'');
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assert.equal(remainingTokens, 0);
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},
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'and removing another 10 tokens': {
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topic: function(_, bucket) {
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this.gStart = +new Date();
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assert.equal(bucket.content, 0);
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bucket.removeTokens(10, this.callback);
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},
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'takes 1 second': function() {
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var duration = +new Date() - this.gStart;
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var diff = Math.abs(1000 - duration);
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assert.ok(diff < TIMING_EPSILON, diff+'');
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}
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},
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'and waiting 2 seconds': {
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topic: function(_, bucket) {
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var self = this;
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setTimeout(function() {
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self.gStart = +new Date();
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bucket.removeTokens(10, self.callback);
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}, 2000);
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},
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'gives us only 10 tokens': function(remainingTokens) {
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var duration = +new Date() - this.gStart;
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assert.ok(duration < TIMING_EPSILON, duration+'');
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assert.equal(remainingTokens, 0);
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},
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'and removing 1 token': {
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topic: function(_, _, bucket) {
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this.gStart = +new Date();
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bucket.removeTokens(1, this.callback);
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},
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'takes 100ms': function() {
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var duration = +new Date() - this.gStart;
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var diff = Math.abs(100 - duration);
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assert.ok(diff < TIMING_EPSILON, diff+'');
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}
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}
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}
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}
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},
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}).export(module);
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