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2026-07-13 12:06:16 +08:00
commit e3c810b1a6
1690 changed files with 228324 additions and 0 deletions
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+'use strict'
+
+const hyperid = require('..')
+const test = require('tape')
+const BloomFilter = require('bloomfilter').BloomFilter
+const maxInt = Math.pow(2, 31) - 1
+
+test('uniqueness', function (t) {
+  t.plan(3)
+
+  const instance = hyperid()
+  const bloom = new BloomFilter(
+    32 * 4096 * 4096, // number of bits to allocate.
+    16 // number of hash functions.
+  )
+
+  let conflicts = 0
+  let ids = 0
+
+  const max = maxInt * 2
+
+  for (let i = 0; i < max; i += Math.ceil(Math.random() * 4096)) {
+    const id = instance()
+
+    if (bloom.test(id)) {
+      conflicts++
+    }
+
+    ids++
+
+    bloom.add(id)
+  }
+
+  t.pass(ids + ' id generated')
+  t.pass(conflicts + ' bloom filter conflicts')
+  t.ok(conflicts / ids < 0.001, '0,1% conflict ratio using bloom filters')
+})
+
+test('url safe uniqueness', function (t) {
+  t.plan(3)
+
+  const instance = hyperid({ urlSafe: true })
+  const bloom = new BloomFilter(
+    32 * 4096 * 4096, // number of bits to allocate.
+    16 // number of hash functions.
+  )
+
+  let conflicts = 0
+  let ids = 0
+
+  const max = maxInt * 2
+
+  for (let i = 0; i < max; i += Math.ceil(Math.random() * 4096)) {
+    const id = instance()
+
+    if (bloom.test(id)) {
+      conflicts++
+    }
+
+    ids++
+
+    bloom.add(id)
+  }
+
+  t.pass(ids + ' id generated')
+  t.pass(conflicts + ' bloom filter conflicts')
+  t.ok(conflicts / ids < 0.001, '0,1% conflict ratio using bloom filters')
+})