atk4\data\tests\FieldTest::testMandatory4 PHP Method

    public function testMandatory4()
    {
        $db = new Persistence_SQL($this->db->connection);
        $a = ['user' => [1 => ['id' => 1, 'name' => 'John', 'surname' => 'Smith']]];
        $this->setDB($a);
        $m = new Model($db, 'user');
        $m->addField('name', ['mandatory' => true]);
        $m->addField('surname');
        $m->load(1);
        $m->save(['name' => null]);
    }