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test.js
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/* istanbul ignore next */
describe('yeast', function () {
'use strict';
var assume = require('assume')
, yeast = require('./');
function waitUntilNextMillisecond() {
var now = +new Date();
while (+new Date() === now) { /* do nothing */ }
}
it('is exported as an function', function () {
assume(yeast).is.a('function');
});
it('exposes the helper functions', function () {
assume(yeast.encode).is.a('function');
assume(yeast.decode).is.a('function');
});
it('returns strings', function () {
assume(yeast()).is.a('string');
});
it('prepends an iterated seed when previous id is the same', function () {
waitUntilNextMillisecond();
var ids = [yeast(), yeast(), yeast()];
assume(ids[0]).does.not.include('.');
assume(ids[1]).includes('.0');
assume(ids[2]).includes('.1');
});
it('resets the seed', function () {
waitUntilNextMillisecond();
var ids = [yeast(), yeast(), yeast()];
assume(ids[0]).does.not.include('.');
assume(ids[1]).includes('.0');
assume(ids[2]).includes('.1');
waitUntilNextMillisecond();
ids = [yeast(), yeast(), yeast()];
assume(ids[0]).does.not.include('.');
assume(ids[1]).includes('.0');
assume(ids[2]).includes('.1');
});
it('does not collide', function () {
var length = 30000
, ids = new Array(length)
, i;
for (i = 0; i < length; i++) ids[i] = yeast();
ids.sort();
for (i = 0; i < length - 1; i++) {
if (ids[i] === ids[i + 1]) throw new Error('Found a duplicate entry');
}
});
it('can convert the id to a timestamp', function () {
waitUntilNextMillisecond();
var now = +new Date()
, id = yeast();
assume(yeast.encode(now)).equals(id);
assume(yeast.decode(id)).equals(now);
});
});