1 var assert = require('assert');
3 var uuid = require('../');
13 v1: /[0-9a-f]{8}-[0-9a-f]{4}-1[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}/i,
14 v4: /[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}/i
19 // Get %'age an actual value differs from the ideal value
20 function divergence(actual, ideal) {
21 return Math.round(100*100*(actual - ideal)/ideal)/100;
24 function rate(msg, t) {
25 log(msg + ': ' + (N / (Date.now() - t) * 1e3 | 0) + ' uuids\/second');
28 for (var version in generators) {
29 var counts = {}, max = 0;
30 var generator = generators[version];
31 var format = UUID_FORMAT[version];
33 log('\nSanity check ' + N + ' ' + version + ' uuids');
34 for (var i = 0, ok = 0; i < N; i++) {
36 if (!format.test(id)) {
37 throw Error(id + ' is not a valid UUID string');
40 if (id != uuid.unparse(uuid.parse(id))) {
41 assert(fail, id + ' is not a valid id');
44 // Count digits for our randomness check
45 if (version == 'v4') {
46 var digits = id.replace(/-/g, '').split('');
47 for (var j = digits.length-1; j >= 0; j--) {
49 max = Math.max(max, counts[c] = (counts[c] || 0) + 1);
54 // Check randomness for v4 UUIDs
55 if (version == 'v4') {
56 // Limit that we get worried about randomness. (Purely empirical choice, this!)
57 var limit = 2*100*Math.sqrt(1/N);
59 log('\nChecking v4 randomness. Distribution of Hex Digits (% deviation from ideal)');
61 for (var i = 0; i < 16; i++) {
62 var c = i.toString(16);
63 var bar = '', n = counts[c], p = Math.round(n/max*100|0);
65 // 1-3,5-8, and D-F: 1:16 odds over 30 digits
68 // 4: 1:1 odds on 1 digit, plus 1:16 odds on 30 digits
69 ideal = N*(1 + 30/16);
70 } else if (i >= 8 && i <= 11) {
71 // 8-B: 1:4 odds on 1 digit, plus 1:16 odds on 30 digits
72 ideal = N*(1/4 + 30/16);
74 // Otherwise: 1:16 odds on 30 digits
77 var d = divergence(n, ideal);
79 // Draw bar using UTF squares (just for grins)
81 while (s--) bar += '=';
83 assert(Math.abs(d) < limit, c + ' |' + bar + '| ' + counts[c] + ' (' + d + '% < ' + limit + '%)');
89 for (var version in generators) {
90 log('\nPerformance testing ' + version + ' UUIDs');
91 var generator = generators[version];
92 var buf = new uuid.BufferClass(16);
94 for (var i = 0, t = Date.now(); i < N; i++) generator();
95 rate('uuid.' + version + '()', t);
97 for (var i = 0, t = Date.now(); i < N; i++) generator('binary');
98 rate('uuid.' + version + '(\'binary\')', t);
100 for (var i = 0, t = Date.now(); i < N; i++) generator('binary', buf);
101 rate('uuid.' + version + '(\'binary\', buffer)', t);