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.
Add WP-API's test-spy-rest-server class to new vendor folder in our test framework.
Create a new unit test case class to extend of of. This can also be a future home for new asserts or methods related to the API tests.