This commit replaces a call to call_user_func_array() in WC_Data_Store::__call() with argument unpacking using the spread operator which was introduced in PHP 5.6. This change should improve WooCommerce performance a tiny bit since WC_Data_Store::__call() is called somewhat frequently and call_user_func_array() has a bad performance reputation. I added one unit test to make sure this change doesn't break the functionality of the altered method.
This commit fixes all 1533 PHPCS errors that PHPCBF can fix automatically in the tests/ directory. Before this change there was a total of 3106 PHPCS errors in the WooCommerce repository and now there is 1573 errors.