62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
/*
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* Copyright (c) 2012 Mathieu Turcotte
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* Licensed under the MIT license.
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*/
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var sinon = require('sinon');
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var ExponentialBackoffStrategy = require('../lib/strategy/exponential');
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exports["ExponentialBackoffStrategy"] = {
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"backoff delays should follow an exponential sequence": function(test) {
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var strategy = new ExponentialBackoffStrategy({
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initialDelay: 10,
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maxDelay: 1000
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});
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// Exponential sequence: x[i] = x[i-1] * 2.
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var expectedDelays = [10, 20, 40, 80, 160, 320, 640, 1000, 1000];
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var actualDelays = expectedDelays.map(function () {
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return strategy.next();
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});
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test.deepEqual(expectedDelays, actualDelays,
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'Generated delays should follow an exponential sequence.');
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test.done();
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},
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"backoff delay factor should be configurable": function (test) {
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var strategy = new ExponentialBackoffStrategy({
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initialDelay: 10,
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maxDelay: 270,
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factor: 3
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});
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// Exponential sequence: x[i] = x[i-1] * 3.
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var expectedDelays = [10, 30, 90, 270, 270];
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var actualDelays = expectedDelays.map(function () {
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return strategy.next();
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});
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test.deepEqual(expectedDelays, actualDelays,
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'Generated delays should follow a configurable exponential sequence.');
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test.done();
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},
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"backoff delays should restart from the initial delay after reset": function(test) {
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var strategy = new ExponentialBackoffStrategy({
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initialDelay: 10,
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maxDelay: 1000
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});
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strategy.next();
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strategy.reset();
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var backoffDelay = strategy.next();
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test.equals(backoffDelay, 10,
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'Strategy should return the initial delay after reset.');
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test.done();
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}
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};
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