Add temporary unit-test functions for random.js

tests/random/random.js

@@ -0,0 +1,33 @@
+let MT;
+try { MT = require("../../random/mersennetwister.js"); } catch(e) { MT = window; }
+
+QUnit.test("Random.init() with no seed value", function() {
+  Random.init();
+  ok(Random.seed, "random seed is not null.");
+});
+
+QUnit.test("Random.init() with provided seed", function() {
+  var seed = new Date().getTime();
+  Random.init(seed);
+  assert.equal(Random.seed, seed, "seed is correct");
+});
+
+QUnit.test("Random.range() PRNG reproducibility", function() {
+  var seed, result1, result2;
+  seed = new Date().getTime();
+  Random.init(seed);
+  result1 = Random.range(1, 20);
+  Random.init(seed);
+  result2 = Random.range(1, 20);
+  assert.equal(result1, result2, "both results are the same")
+});
+
+QUinit.test("Random.choose() with equal distribution", function() {
+  var i, tmp, foo = 0, bar = 0;
+  for(i = 0; i < 100; i++) {
+    tmp = Random.choose([[1, 'foo'], [1, 'bar']]);
+    if (tmp == "foo") { foo += 1; }
+    if (tmp == "bar") { bar += 1; }
+  }
+  assert.ok(bar > 0 && foo > 0, "both objects were chosen")
+});