Integrity constraint violation in EcomDev_PHPUnitTest fixture data  #166

We're setting up a site with a reasonably complex multi-store structure. We've got a setup script that deletes the standard base website and store view, before creating our own. As a result, there's no website_id/store_id 1 in our database. The fixture loader fails with the following error when loading app/code/community/EcomDev/PHPUnitTest/Test/Helper/_data/fx-customers.yaml:

PHP Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (mysite_test.customer_entity, CONSTRAINT FK_CUSTOMER_ENTITY_STORE_ID_CORE_STORE_STORE_ID FOREIGN KEY (store_id) REFERENCES core_store (store_id) ON DELETE SET NULL ON UPDATE CASCADE)' in /var/www/vhosts/mysite/lib/Zend/Db/Statement/Pdo.php:228

We find that putting all of the required data into fixtures (e.g. default scope, root categories) even if that data would normally be created by core setup scripts leads to more isolated tests.