10 files declare their use of TestDatabase
- bootstrap.inc in core/includes/ bootstrap.inc 
- Functions that need to be loaded on every Drupal request.
- DrupalKernel.php in core/lib/ Drupal/ Core/ DrupalKernel.php 
- KernelTestBase.php in core/tests/ Drupal/ KernelTests/ KernelTestBase.php 
- QuickStartTest.php in core/tests/ Drupal/ Tests/ Core/ Command/ QuickStartTest.php 
- simpletest.install in core/modules/ simpletest/ simpletest.install 
- Uninstall functions for the simpletest module.
- TestDatabaseTest.php in core/tests/ Drupal/ Tests/ Core/ Test/ TestDatabaseTest.php 
- TestSiteApplicationTest.php in core/tests/ Drupal/ Tests/ Scripts/ TestSiteApplicationTest.php 
- TestSiteInstallCommand.php in core/tests/ Drupal/ TestSite/ Commands/ TestSiteInstallCommand.php 
- TestSiteReleaseLocksCommand.php in core/tests/ Drupal/ TestSite/ Commands/ TestSiteReleaseLocksCommand.php 
- TestSiteTearDownCommand.php in core/tests/ Drupal/ TestSite/ Commands/ TestSiteTearDownCommand.php 
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