public function testPasswordField()
{
$field = new CoreFields\PasswordField();
$password = "******";
$hash_password = $field->check($password);
$this->assertEquals('', CoreFields\PasswordField::check_password("a", $hash_password));
$simple_password = "******";
$hash_password = $field->check($simple_password);
$this->assertTrue(CoreFields\PasswordField::check_password($simple_password, $hash_password));
}