public function testSetChars()
 {
     try {
         Base62Utils::setChars('qwerty');
         $this->fail('Length test failed');
     } catch (WrongArgumentException $e) {
         //ok
     }
     try {
         Base62Utils::setChars('0123456789abcdefghijklmn' . 'ЭЮЯ' . 'rstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ');
         $this->fail('Pattern matching failed');
     } catch (WrongArgumentException $e) {
         //is ok
     }
 }