public function testPassword()
 {
     $user = new User();
     $pass = '******';
     $user->setPassword($pass);
     $user->setPlainPassword($pass);
     $this->assertEquals($pass, $user->getPassword());
     $this->assertEquals($pass, $user->getPlainPassword());
     $user->eraseCredentials();
     $this->assertNull($user->getPlainPassword());
 }