PrepareForTest(); $a = new \goodboyalex\php_components_pack\tests\data\A(); $a->a = 'a'; $a->b = 2; $a->c = true; $b = new B(); ClassMapper::MapClass($a, $b); $this->assertEquals('a', $b->a); $this->assertEquals(2, $b->b); } private function PrepareForTest (): void { require_once __DIR__ . '/../../sources/classes/classMapper.php'; } }