BackdropUnitTestCase::setUp in core/modules/simpletest/backdrop_web_test_case.php

Sets up unit test environment.

BackdropWebTestCase::changeDatabasePrefix in core/modules/simpletest/backdrop_web_test_case.php

Changes the database connection to the prefixed one.

BackdropWebTestCase::setUp in core/modules/simpletest/backdrop_web_test_case.php

Sets up a Backdrop site for running functional and integration tests.

UpgradePathTestCase::setUp in core/modules/simpletest/tests/upgrade/upgrade.test

Overrides BackdropWebTestCase::setUp() for upgrade testing.