port HTTPEncoderTest to phpunit

tests/TestCase.php

@@ -10,6 +10,19 @@ class TestCase extends PHPUnit_Framework_TestCase
         self::$test_files = __DIR__ . '/../min_unit_tests/_test_files';
     }
 
+    /**
+     * Get number of bytes in a string regardless of mbstring.func_overload
+     *
+     * @param string $str
+     * @return int
+     */
+    protected function countBytes($str)
+    {
+        return (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2))
+            ? mb_strlen($str, '8bit')
+            : strlen($str);
+    }
+
     /**
      * Excluding from phpunit.xml does not work, even using dir,
      * hence this dummy test.