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