how to set Custom Select and MultiSelect value while Product add Programatically Magento 2

I am working on to create a simple product programmatically.

I have created 2 custom Attribute

1. Select(select_testing)
2. MultiSelect(multiselect_testing)

select_testing attribute value ==> 1, 2, ,3, 4. multiselect_testing attribute value --> 1, 2, 3, 4.

So, I try to add Product using following code.

  $_objectManager = \Magento\Framework\App\ObjectManager::getInstance(); // instance of object manager
  $simple_product = $_objectManager->create('\Magento\Catalog\Model\Product');
  $simple_product->setSku('test-sku');
  $simple_product->setName('SimpleProduct');
  $simple_product->setRkTesting('Rk Testing');
  $simple_product->setSelectTesting('1');
  $simple_product->setMultiselectTesting(array("1","2"));
  $simple_product->setYesTesting(1);
  $simple_product->save();

But, Select and Multiselect attribute value not save.

Suggest me, how to add Select and multiselect Attribute value.