linx-simulator2/node_modules/backoff/tests/backoff_strategy.js

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2019-09-18 08:11:16 +00:00
/*
* Copyright (c) 2012 Mathieu Turcotte
* Licensed under the MIT license.
*/
var sinon = require('sinon');
var util = require('util');
var BackoffStrategy = require('../lib/strategy/strategy');
function SampleBackoffStrategy(options) {
BackoffStrategy.call(this, options);
}
util.inherits(SampleBackoffStrategy, BackoffStrategy);
SampleBackoffStrategy.prototype.next_ = function() {
return this.getInitialDelay();
};
SampleBackoffStrategy.prototype.reset_ = function() {};
exports["BackoffStrategy"] = {
setUp: function(callback) {
this.random = sinon.stub(Math, 'random');
callback();
},
tearDown: function(callback) {
this.random.restore();
callback();
},
"the randomisation factor should be between 0 and 1": function(test) {
test.throws(function() {
new BackoffStrategy({
randomisationFactor: -0.1
});
});
test.throws(function() {
new BackoffStrategy({
randomisationFactor: 1.1
});
});
test.doesNotThrow(function() {
new BackoffStrategy({
randomisationFactor: 0.5
});
});
test.done();
},
"the raw delay should be randomized based on the randomisation factor": function(test) {
var strategy = new SampleBackoffStrategy({
randomisationFactor: 0.5,
initialDelay: 1000
});
this.random.returns(0.5);
var backoffDelay = strategy.next();
test.equals(backoffDelay, 1000 + (1000 * 0.5 * 0.5));
test.done();
},
"the initial backoff delay should be greater than 0": function(test) {
test.throws(function() {
new BackoffStrategy({
initialDelay: -1
});
});
test.throws(function() {
new BackoffStrategy({
initialDelay: 0
});
});
test.doesNotThrow(function() {
new BackoffStrategy({
initialDelay: 1
});
});
test.done();
},
"the maximal backoff delay should be greater than 0": function(test) {
test.throws(function() {
new BackoffStrategy({
maxDelay: -1
});
});
test.throws(function() {
new BackoffStrategy({
maxDelay: 0
});
});
test.done();
},
"the maximal backoff delay should be greater than the initial backoff delay": function(test) {
test.throws(function() {
new BackoffStrategy({
initialDelay: 10,
maxDelay: 10
});
});
test.doesNotThrow(function() {
new BackoffStrategy({
initialDelay: 10,
maxDelay: 11
});
});
test.done();
}
};