public function testSetGetFields()
{
$user = new LeanUser();
$user->setUsername("alice");
$user->setEmail("*****@*****.**");
$user->setMobilePhoneNumber("18612340000");
$this->assertEquals("alice", $user->getUsername());
$this->assertEquals("*****@*****.**", $user->getEmail());
$this->assertEquals("18612340000", $user->getMobilePhoneNumber());
// additional fields could be set too
$user->set("age", 24);
$this->assertEquals(24, $user->get("age"));
}