[According to the WooCommerce wiki](https://github.com/woocommerce/woocommerce/wiki/Order-and-Order-Line-Item-Data) and `WC_REST_Orders_Controller`, WooCommerce stores country codes using the ISO 3166-1 alpha-2 (2 character) standard. However, the `WC_Tests_Order_Functions::test_wc_get_order_address_params()` test method was using 'USA' instead of 'US'.
As @claudiosanches pointed out, there isn't much real-world need for `WC_Install::get_tables()` to sort results. Instead, sort the returned value within the `WC_Tests_Install::test_get_tables()` method.
Since custom tables can be registered within WooCommerce via the 'woocommerce_install_get_tables' filter, it's helpful to ensure that `WC_Install::get_tables()` automatically sorts the table names alphabetically.
This helps avoid false failures when testing a plugin that uses a custom table against the WooCommerce core test suite, as queries like `WC_Tests_Install::test_get_tables()` assumes that tables will be returned in alphabetical order.
WC unit tests don't need to remove data from the database before finishing. `WP_UnitTestCase` creates a transaction before each test starts and roll it back after it ends, so data is never actually written to the database. This simplifies the tests and makes them faster.
parent::setUp() should be called inside test setup methods to make sure database changes are automatically reverted after each test is executed. This way it is not necessary to manually remove inserted data.
This commits adds a call to `parent::setUp()` inside WC_Tests_Product_CSV_Importer::setUp(). This is necessary to make sure transactions are used on database calls and thus tests don't have to worry about cleaning inserted data.
I found this issue while debugging https://github.com/woocommerce/woocommerce-product-tables-feature-plugin/issues/81. Turns out this test was failing because WC_Tests_Product_CSV_Importer::test_import() was leaving one post in the database due to a bug in the custom product tables plugin.
Mike Jolley
Rodrigo Primo
Gerhard Potgieter
Steve Grunwell
Peter Fabian
Claudiu Lodromanean
Claudio Sanches