Tracking de l'application VApp (IHM du jeu)

VApp/node_modules/mux.js/test/utils.bin.test.js

@@ -0,0 +1,32 @@
+var
+  QUnit = require('qunit'),
+  toUnsigned = require('../lib/utils/bin').toUnsigned;
+
+QUnit.module('Binary Utils');
+
+QUnit.test('converts values to unsigned integers after bitwise operations', function(assert) {
+  var bytes;
+
+  bytes = [0, 0, 124, 129];
+
+  assert.equal(toUnsigned(bytes[0] << 24 |
+                         bytes[1] << 16 |
+                         bytes[2] <<  8 |
+                         bytes[3]),
+              31873, 'positive signed result stays positive');
+
+  bytes = [150, 234, 221, 192];
+
+  // sanity check
+  assert.equal(bytes[0] << 24 |
+              bytes[1] << 16 |
+              bytes[2] <<  8 |
+              bytes[3],
+              -1762992704, 'bitwise operation produces negative signed result');
+
+  assert.equal(toUnsigned(bytes[0] << 24 |
+                         bytes[1] << 16 |
+                         bytes[2] <<  8 |
+                         bytes[3]),
+              2531974592, 'negative signed result becomes unsigned positive');
+});