sdfsdfs

node_modules/crypto-browserify/test/random-bytes.js

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+var test = require('tape')
+var crypto = require('../')
+
+var randomBytesFunctions = {
+  randomBytes: require('randombytes'),
+  pseudoRandomBytes: crypto.pseudoRandomBytes
+}
+
+for (var randomBytesName in randomBytesFunctions) {
+  // Both randomBytes and pseudoRandomBytes should provide the same interface
+  var randomBytes = randomBytesFunctions[randomBytesName]
+
+  test('get error message', function (t) {
+    try {
+      var b = randomBytes(10)
+      t.ok(Buffer.isBuffer(b))
+      t.end()
+    } catch (err) {
+      t.ok(/not supported/.test(err.message), '"not supported"  is in error message')
+      t.end()
+    }
+  })
+
+  test(randomBytesName, function (t) {
+    t.plan(5)
+    t.equal(randomBytes(10).length, 10)
+    t.ok(Buffer.isBuffer(randomBytes(10)))
+    randomBytes(10, function (ex, bytes) {
+      t.error(ex)
+      t.equal(bytes.length, 10)
+      t.ok(Buffer.isBuffer(bytes))
+      t.end()
+    })
+  })
+
+  test(randomBytesName + ' seem random', function (t) {
+    var L = 1000
+    var b = randomBytes(L)
+
+    var mean = [].reduce.call(b, function (a, b) { return a + b }, 0) / L
+
+    // test that the random numbers are plausably random.
+    // Math.random() will pass this, but this will catch
+    // terrible mistakes such as this blunder:
+    // https://github.com/dominictarr/crypto-browserify/commit/3267955e1df7edd1680e52aeede9a89506ed2464#commitcomment-7916835
+
+    // this doesn't check that the bytes are in a random *order*
+    // but it's better than nothing.
+
+    var expected = 256 / 2
+    var smean = Math.sqrt(mean)
+
+    // console.log doesn't work right on testling, *grumble grumble*
+    console.log(JSON.stringify([expected - smean, mean, expected + smean]))
+    t.ok(mean < expected + smean)
+    t.ok(mean > expected - smean)
+
+    t.end()
+  })
+}