var assert = require("assert");
|
var seedrandom = require("../seedrandom");
|
var requirejs = require("requirejs");
|
|
// Stub out requirejs if in the browser via browserify.
|
if (!requirejs.config) {
|
requirejs = require;
|
} else {
|
requirejs.config({
|
baseUrl: __dirname
|
});
|
}
|
|
describe("Nodejs API Test", function() {
|
|
it('should pass basic tests.', function() {
|
var original = Math.random,
|
result, r, xprng, obj, as2, as3, autoseed1, myrng,
|
firstprng, secondprng, thirdprng, rng;
|
|
result = Math.seedrandom('hello.');
|
firstprng = Math.random;
|
assert.ok(original !== firstprng, "Should change Math.random.");
|
assert.equal(result, "hello.", "Should return short seed.");
|
r = Math.random();
|
assert.equal(r, 0.9282578795792454, "Should be 'hello.'#1");
|
r = Math.random();
|
assert.equal(r, 0.3752569768646784, "Should be 'hello.'#2");
|
|
// should be able to autoseed
|
result = Math.seedrandom();
|
secondprng = Math.random;
|
assert.ok(original !== secondprng, "Should change Math.random.");
|
assert.ok(firstprng !== secondprng, "Should change Math.random.");
|
assert.equal(result.length, 256, "Should return short seed.");
|
r = Math.random();
|
assert.ok(r > 0, "Should be posititive.");
|
assert.ok(r < 1, "Should be less than 1.");
|
assert.ok(r != 0.9282578795792454, "Should not be 'hello.'#1");
|
assert.ok(r != 0.3752569768646784, "Should not be 'hello.'#2");
|
assert.ok(r != 0.7316977468919549, "Should not be 'hello.'#3");
|
autoseed1 = r;
|
|
// should be able to add entropy.
|
result = Math.seedrandom('added entropy.', { entropy:true });
|
assert.equal(result.length, 256, "Should return short seed.");
|
thirdprng = Math.random;
|
assert.ok(thirdprng !== secondprng, "Should change Math.random.");
|
r = Math.random();
|
assert.ok(r != 0.597067214994467, "Should not be 'added entropy.'#1");
|
|
// Reset to original Math.random.
|
Math.random = original;
|
// should be able to use new Math.seedrandom('hello.')
|
myrng = new Math.seedrandom('hello.');
|
assert.ok(original === Math.random, "Should not change Math.random.");
|
assert.ok(original !== myrng, "PRNG should not be Math.random.");
|
r = myrng();
|
assert.equal(r, 0.9282578795792454, "Should be 'hello.'#1");
|
|
// should be able to use seedrandom('hello.')"
|
rng = seedrandom('hello.');
|
assert.equal(typeof(rng), 'function', "Should return a function.");
|
r = rng();
|
assert.equal(r, 0.9282578795792454, "Should be 'hello.'#1");
|
assert.ok(original === Math.random, "Should not change Math.random.");
|
assert.ok(original !== rng, "PRNG should not be Math.random.");
|
|
// Global PRNG: set Math.random.
|
// should be able to use seedrandom('hello.', { global: true })
|
result = seedrandom('hello.', { global: true });
|
assert.equal(result, 'hello.', "Should return short seed.");
|
assert.ok(original != Math.random, "Should change Math.random.");
|
r = Math.random();
|
assert.equal(r, 0.9282578795792454, "Should be 'hello.'#1");
|
|
// Autoseeded non-global
|
Math.random = original;
|
// should be able to use seedrandom()
|
result = seedrandom();
|
assert.equal(typeof(result), 'function', "Should return function.");
|
assert.ok(original === Math.random, "Should not change Math.random.");
|
r = result();
|
// got " + r);
|
assert.ok(r != autoseed1, "Should not repeat previous autoseed.");
|
assert.ok(r != 0.9282578795792454, "Should not be 'hello.'#1");
|
assert.ok(r != 0.7316977468919549, "Should not be 'hello.'#3");
|
|
// Mixing accumulated entropy.
|
// should be able to use seedrandom('added entropy.', { entropy: true })
|
rng = seedrandom('added entropy.', { entropy: true });
|
r = result();
|
// got " + r);
|
assert.ok(r != autoseed1, "Should not repeat previous autoseed.");
|
assert.ok(r != 0.597067214994467, "Should not be 'added entropy.'#1");
|
|
// Legacy calling convention for mixing accumulated entropy.
|
// should be able to use seedrandom('added entropy.', true)
|
rng = seedrandom('added entropy.', true);
|
r = result();
|
// got " + r);
|
assert.ok(r != autoseed1, "Should not repeat previous autoseed.");
|
assert.ok(r != 0.597067214994467, "Should not be 'added entropy.'#1");
|
|
// The pass option
|
// should be able to use Math.seedrandom(null, { pass: ...
|
obj = Math.seedrandom(null, { pass: function(prng, seed) {
|
return { random: prng, seed: seed };
|
}});
|
assert.ok(original === Math.random, "Should not change Math.random.");
|
assert.ok(original !== obj.random, "Should be different from Math.random.");
|
assert.equal(typeof(obj.random), 'function', "Should return a PRNG function.");
|
assert.equal(typeof(obj.seed), 'string', "Should return a seed.");
|
as2 = obj.random();
|
assert.ok(as2 != 0.9282578795792454, "Should not be 'hello.'#1");
|
rng = seedrandom(obj.seed);
|
as3 = rng();
|
assert.equal(as2, as3, "Should be reproducible when using the seed.");
|
|
// Exercise pass again, with explicit seed and global
|
// should be able to use Math.seedrandom('hello.', { pass: ...
|
result = Math.seedrandom('hello.', {
|
global: 'abc',
|
pass: function(prng, seed, global) {
|
assert.equal(typeof(prng), 'function', "Callback arg #1 assert");
|
assert.equal(seed, 'hello.', "Callback arg #2 assert");
|
assert.equal(global, 'abc', "Callback arg #3 passed through.");
|
assert.equal(prng(), 0.9282578795792454, "Should be 'hello.'#1");
|
return 'def';
|
}});
|
assert.equal(result, 'def', "Should return value from callback.");
|
assert.ok(original === Math.random, "Should not change Math.random.");
|
|
// Legacy third argument callback argument:
|
// should be able to use Math.seedrandom('hello.', { global: 50 }, callback)
|
result = Math.seedrandom('hello.', { global: 50 },
|
function(prng, seed, global) {
|
assert.equal(typeof(prng), 'function', "Callback arg #1 assert");
|
assert.equal(seed, 'hello.', "Callback arg #2 assert");
|
assert.equal(global, 50, "Callback arg #3 assert");
|
assert.equal(prng(), 0.9282578795792454, "Should be 'hello.'#1");
|
return 'zzz';
|
});
|
assert.equal(result, 'zzz', "Should return value from callback.");
|
assert.ok(original === Math.random, "Should not change Math.random.");
|
|
// Global: false.
|
// should be able to use new Math.seedrandom('hello.', {global: false})
|
myrng = new Math.seedrandom('hello.', {global:false});
|
assert.equal(typeof(myrng), 'function', "Should return a PRNG funciton.");
|
assert.ok(original === Math.random, "Should not change Math.random.");
|
assert.ok(original !== myrng, "PRNG should not be Math.random.");
|
r = myrng();
|
assert.equal(r, 0.9282578795792454, "Should be 'hello.'#1");
|
|
// options = {} when a method of Math.
|
// should be able to use Math.seedrandom('hello.', {})
|
result = Math.seedrandom('hello.');
|
xprng = Math.random;
|
assert.ok(original !== xprng, "Should change Math.random.");
|
assert.equal(result, "hello.", "Should return short seed.");
|
r = Math.random();
|
assert.equal(r, 0.9282578795792454, "Should be 'hello.'#1");
|
r = Math.random();
|
assert.equal(r, 0.3752569768646784, "Should be 'hello.'#2");
|
Math.random = original;
|
|
// options = {} when not a method of Math
|
// should be able to use seedrandom('hello.', {})
|
rng = seedrandom('hello.', {});
|
assert.equal(typeof(rng), 'function', "Should return a function.");
|
r = rng();
|
assert.equal(r, 0.9282578795792454, "Should be 'hello.'#1");
|
assert.ok(original === Math.random, "Should not change Math.random.");
|
assert.ok(original !== rng, "PRNG should not be Math.random.");
|
});
|
|
it('should support state api.', function() {
|
// Verify that there is no state method
|
var dummy = seedrandom('hello');
|
var unexpected = -1;
|
var expected = -1;
|
try {
|
unexpected = dummy.state();
|
} catch(e) {
|
expected = 1;
|
}
|
assert.equal(unexpected, -1);
|
assert.equal(expected, 1);
|
var count = 0;
|
for (var x in dummy) {
|
if (x == 'state') count += 1;
|
}
|
assert.equal(count, 0);
|
|
// Verify that a state method can be added
|
var saveable = seedrandom("secret-seed", {state: true});
|
var ordinary = seedrandom("secret-seed");
|
for (var j = 0; j < 1e2; ++j) {
|
assert.equal(ordinary(), saveable());
|
}
|
var virgin = seedrandom("secret-seed");
|
var saved = saveable.state();
|
var replica = seedrandom("", {state: saved});
|
for (var j = 0; j < 1e2; ++j) {
|
var r = replica();
|
assert.equal(r, saveable());
|
assert.equal(r, ordinary());
|
assert.ok(r != virgin());
|
}
|
});
|
|
it('should support requirejs in node.', function() {
|
var original = Math.random;
|
var rsr = requirejs('../seedrandom');
|
var rng = rsr('hello.');
|
assert.equal(typeof(rng), 'function', "Should return a function.");
|
var r = rng();
|
assert.equal(r, 0.9282578795792454, "Should be 'hello.'#1");
|
assert.ok(original === Math.random, "Should not change Math.random.");
|
assert.ok(original !== rng, "PRNG should not be Math.random.");
|
});
|
|
// End of test.
|
|
});
|
