public function testHashingIsAlwaysCorrect()
 {
     $hasher = new Hasher();
     $password = '******';
     $hashedPassword = $hasher->hash($password);
     $this->assertTrue($hasher->checkhash($password, $hashedPassword));
     $this->assertFalse($hasher->checkhash($password . '$', $hashedPassword));
 }