created initial unit tests for main zerobin class

tst/serversalt.php

@@ -35,7 +35,22 @@ class serversaltTest extends PHPUnit_Framework_TestCase
         // generating new salt
         serversalt::setPath($this->_path);
         $salt = serversalt::get();
-        require 'mcrypt_mock.php';
+
+        // mcrypt mock
+        if (!defined('MCRYPT_DEV_URANDOM')) define('MCRYPT_DEV_URANDOM', 1);
+        function mcrypt_create_iv($int, $flag)
+        {
+            $randomSalt = '';
+            for($i = 0; $i < 256; ++$i) {
+                $randomSalt .= base_convert(mt_rand(), 10, 16);
+            }
+            // hex2bin requires an even length, pad if necessary
+            if (strlen($randomSalt) % 2)
+            {
+                $randomSalt = '0' . $randomSalt;
+            }
+            return hex2bin($randomSalt);
+        }
         $this->assertNotEquals($salt, serversalt::generate());
 
         // try setting a different path and resetting it