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- var assert = require('assert');
- var uuid = require('../');
- var log = console.log;
- var generators = {
- v1: uuid.v1,
- v4: uuid.v4
- };
- var UUID_FORMAT = {
- v1: /[0-9a-f]{8}-[0-9a-f]{4}-1[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}/i,
- v4: /[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}/i
- };
- var N = 1e4;
- // Get %'age an actual value differs from the ideal value
- function divergence(actual, ideal) {
- return Math.round(100*100*(actual - ideal)/ideal)/100;
- }
- function rate(msg, t) {
- log(msg + ': ' + (N / (Date.now() - t) * 1e3 | 0) + ' uuids\/second');
- }
- for (var version in generators) {
- var counts = {}, max = 0;
- var generator = generators[version];
- var format = UUID_FORMAT[version];
- log('\nSanity check ' + N + ' ' + version + ' uuids');
- for (var i = 0, ok = 0; i < N; i++) {
- id = generator();
- if (!format.test(id)) {
- throw Error(id + ' is not a valid UUID string');
- }
- if (id != uuid.unparse(uuid.parse(id))) {
- assert(fail, id + ' is not a valid id');
- }
- // Count digits for our randomness check
- if (version == 'v4') {
- var digits = id.replace(/-/g, '').split('');
- for (var j = digits.length-1; j >= 0; j--) {
- var c = digits[j];
- max = Math.max(max, counts[c] = (counts[c] || 0) + 1);
- }
- }
- }
- // Check randomness for v4 UUIDs
- if (version == 'v4') {
- // Limit that we get worried about randomness. (Purely empirical choice, this!)
- var limit = 2*100*Math.sqrt(1/N);
- log('\nChecking v4 randomness. Distribution of Hex Digits (% deviation from ideal)');
- for (var i = 0; i < 16; i++) {
- var c = i.toString(16);
- var bar = '', n = counts[c], p = Math.round(n/max*100|0);
- // 1-3,5-8, and D-F: 1:16 odds over 30 digits
- var ideal = N*30/16;
- if (i == 4) {
- // 4: 1:1 odds on 1 digit, plus 1:16 odds on 30 digits
- ideal = N*(1 + 30/16);
- } else if (i >= 8 && i <= 11) {
- // 8-B: 1:4 odds on 1 digit, plus 1:16 odds on 30 digits
- ideal = N*(1/4 + 30/16);
- } else {
- // Otherwise: 1:16 odds on 30 digits
- ideal = N*30/16;
- }
- var d = divergence(n, ideal);
- // Draw bar using UTF squares (just for grins)
- var s = n/max*50 | 0;
- while (s--) bar += '=';
- assert(Math.abs(d) < limit, c + ' |' + bar + '| ' + counts[c] + ' (' + d + '% < ' + limit + '%)');
- }
- }
- }
- // Perf tests
- for (var version in generators) {
- log('\nPerformance testing ' + version + ' UUIDs');
- var generator = generators[version];
- var buf = new uuid.BufferClass(16);
- for (var i = 0, t = Date.now(); i < N; i++) generator();
- rate('uuid.' + version + '()', t);
- for (var i = 0, t = Date.now(); i < N; i++) generator('binary');
- rate('uuid.' + version + '(\'binary\')', t);
- for (var i = 0, t = Date.now(); i < N; i++) generator('binary', buf);
- rate('uuid.' + version + '(\'binary\', buffer)', t);
- }
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