atk4\data\tests\ReferenceTest::testCustomRef PHP Method

    public function testCustomRef()
    {
        $a = [];
        $p = new \atk4\data\Persistence_Array($a);
        $m = new Model($p, ['table' => 'user']);
        $m->addRef('archive', function ($m) {
            return $m->newInstance(null, ['table' => $m->table . '_archive']);
        });
        $this->assertEquals('user_archive', $m->ref('archive')->table);
    }