6 files declare their use of ModuleUninstallValidatorException
- CommentUninstallTest.php in core/modules/ comment/ tests/ src/ Kernel/ CommentUninstallTest.php 
- InstallerNonDefaultDatabaseDriverTest.php in core/tests/ Drupal/ FunctionalTests/ Installer/ InstallerNonDefaultDatabaseDriverTest.php 
- InstallerTest.php in core/tests/ Drupal/ FunctionalTests/ Installer/ InstallerTest.php 
- InstallProfileDependenciesTest.php in core/tests/ Drupal/ FunctionalTests/ Installer/ InstallProfileDependenciesTest.php 
- ModuleHandlerTest.php in core/modules/ system/ tests/ src/ Kernel/ Extension/ ModuleHandlerTest.php 
- ThemeInstallerTest.php in core/tests/ Drupal/ KernelTests/ Core/ Theme/ ThemeInstallerTest.php 
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