seedrandom
Version:
Seeded random number generator for Javascript.
196 lines (174 loc) • 7.17 kB
HTML
<html>
<head>
<link rel="stylesheet" href="lib/qunit.css">
</head>
<body>
<div id="qunit"></div>
<div id="qunit-fixture"></div>
<script src="../seedrandom.min.js"></script>
<script src="lib/qunit.js"></script>
<script>
module("Options API Test");
test("Verify that we can use documented options", function() {
ok(true, "Seeded random created with new:");
var original = Math.random;
ok(true, "Using Math.seedrandom('hello.')");
var result = Math.seedrandom('hello.');
var firstprng = Math.random;
ok(original !== firstprng, "Should change Math.random.");
equal(result, "hello.", "Should return short seed.");
var r = Math.random();
ok(true, "Got " + r);
equal(r, 0.9282578795792454, "Should be 'hello.'#1");
r = Math.random();
ok(true, "Got " + r);
equal(r, 0.3752569768646784, "Should be 'hello.'#2");
ok(true, "Using Math.seedrandom()");
result = Math.seedrandom();
var secondprng = Math.random;
ok(original !== secondprng, "Should change Math.random.");
ok(firstprng !== secondprng, "Should change Math.random.");
equal(result.length, 256, "Should return short seed.");
r = Math.random();
ok(true, "Got " + r);
ok(r != 0.9282578795792454, "Should not be 'hello.'#1");
ok(r != 0.7316977468919549, "Should not be 'hello.'#3");
var autoseed1 = r;
ok(true, "Using Math.seedrandom('added entropy.', { entropy:true })");
result = Math.seedrandom('added entropy.', { entropy:true });
equal(result.length, 256, "Should return short seed.");
var thirdprng = Math.random;
ok(thirdprng !== secondprng, "Should change Math.random.");
r = Math.random();
ok(true, "Got " + r);
ok(r != 0.597067214994467, "Should not be 'added entropy.'#1");
// Reset to original Math.random.
Math.random = original;
ok(true, "Using new Math.seedrandom('hello.')");
var myrng = new Math.seedrandom('hello.');
ok(original === Math.random, "Should not change Math.random.");
ok(original !== myrng, "PRNG should not be Math.random.");
r = myrng();
ok(true, "Got " + r);
equal(r, 0.9282578795792454, "Should be 'hello.'#1");
// Use "quick" to get only 32 bits of randomness in a float.
equal(myrng.quick(), 0.3752569768112153, "Should be quick #1.1");
// Use "int32" to get a 32 bit (signed) integer
equal(myrng.int32(), 986220731, "Should be int32 #1.2");
// As if brought in by node.js
var seedrandom = Math.seedrandom;
ok(true, "Using seedrandom('hello.')");
var rng = seedrandom('hello.');
equal(typeof(rng), 'function', "Should return a function.");
r = rng();
ok(true, "Got " + r);
equal(r, 0.9282578795792454, "Should be 'hello.'#1");
ok(original === Math.random, "Should not change Math.random.");
ok(original !== rng, "PRNG should not be Math.random.");
// Global PRNG: set Math.random.
ok(true, "Using seedrandom('hello.', { global: true })");
result = seedrandom('hello.', { global: true });
equal(result, 'hello.', "Should return short seed.");
ok(original != Math.random, "Should change Math.random.");
r = Math.random();
ok(true, "Got " + r);
equal(r, 0.9282578795792454, "Should be 'hello.'#1");
// Autoseeded non-global
Math.random = original;
ok(true, "Using seedrandom()");
result = seedrandom();
equal(typeof(result), 'function', "Should return function.");
ok(original === Math.random, "Should not change Math.random.");
r = result();
ok(true, "Got " + r);
ok(r != autoseed1, "Should not repeat previous autoseed.");
ok(r != 0.9282578795792454, "Should not be 'hello.'#1");
ok(r != 0.7316977468919549, "Should not be 'hello.'#3");
// Mixing accumulated entropy.
ok(true, "Using seedrandom('added entropy.', { entropy: true })");
rng = seedrandom('added entropy.', { entropy: true });
r = result();
ok(true, "Got " + r);
ok(r != autoseed1, "Should not repeat previous autoseed.");
ok(r != 0.597067214994467, "Should not be 'added entropy.'#1");
// Legacy calling convention for mixing accumulated entropy.
ok(true, "Using seedrandom('added entropy.', true)");
rng = seedrandom('added entropy.', true);
r = result();
ok(true, "Got " + r);
ok(r != autoseed1, "Should not repeat previous autoseed.");
ok(r != 0.597067214994467, "Should not be 'added entropy.'#1");
// The pass option
ok(true, "Using Math.seedrandom(null, { pass: ...");
var obj = Math.seedrandom(null, { pass: function(prng, seed) {
return { random: prng, seed: seed };
}});
ok(original === Math.random, "Should not change Math.random.");
ok(original !== obj.random, "Should be different from Math.random.");
equal(typeof(obj.random), 'function', "Should return a PRNG function.");
equal(typeof(obj.seed), 'string', "Should return a seed.");
var as2 = obj.random();
ok(as2 != 0.9282578795792454, "Should not be 'hello.'#1");
rng = seedrandom(obj.seed);
var as3 = rng();
equal(as2, as3, "Should be reproducible when using the seed.");
// Exercise pass again, with explicit seed and global
ok(true, "Using Math.seedrandom('hello.', { pass: ...");
result = Math.seedrandom('hello.', {
global: 'abc',
pass: function(prng, seed, global) {
equal(typeof(prng), 'function', "Callback arg #1 ok");
equal(seed, 'hello.', "Callback arg #2 ok");
equal(global, 'abc', "Callback arg #3 passed through.");
equal(prng(), 0.9282578795792454, "Should be 'hello.'#1");
return 'def';
}});
equal(result, 'def', "Should return value from callback.");
ok(original === Math.random, "Should not change Math.random.");
// Legacy third argument callback argument:
ok(true, "Using Math.seedrandom('hello.', { global: 50 }, callback)");
result = Math.seedrandom('hello.', { global: 50 },
function(prng, seed, global) {
equal(typeof(prng), 'function', "Callback arg #1 ok");
equal(seed, 'hello.', "Callback arg #2 ok");
equal(global, 50, "Callback arg #3 ok");
equal(prng(), 0.9282578795792454, "Should be 'hello.'#1");
return 'zzz';
});
equal(result, 'zzz', "Should return value from callback.");
ok(original === Math.random, "Should not change Math.random.");
// Global: false.
ok(true, "Using new Math.seedrandom('hello.', {global: false})");
myrng = new Math.seedrandom('hello.', {global:false});
equal(typeof(myrng), 'function', "Should return a PRNG funciton.");
ok(original === Math.random, "Should not change Math.random.");
ok(original !== myrng, "PRNG should not be Math.random.");
r = myrng();
ok(true, "Got " + r);
equal(r, 0.9282578795792454, "Should be 'hello.'#1");
// options = {} when a method of Math.
ok(true, "Using Math.seedrandom('hello.', {})");
var result = Math.seedrandom('hello.');
var xprng = Math.random;
ok(original !== xprng, "Should change Math.random.");
equal(result, "hello.", "Should return short seed.");
var r = Math.random();
ok(true, "Got " + r);
equal(r, 0.9282578795792454, "Should be 'hello.'#1");
r = Math.random();
ok(true, "Got " + r);
equal(r, 0.3752569768646784, "Should be 'hello.'#2");
Math.random = original;
// options = {} when not a method of Math
ok(true, "Using seedrandom('hello.', {})");
rng = seedrandom('hello.', {});
equal(typeof(rng), 'function', "Should return a function.");
r = rng();
ok(true, "Got " + r);
equal(r, 0.9282578795792454, "Should be 'hello.'#1");
ok(original === Math.random, "Should not change Math.random.");
ok(original !== rng, "PRNG should not be Math.random.");
});
</script>
</body>
</html>