16 files declare their use of AssertMailTrait
- AssertMailTraitTest.php in core/tests/ Drupal/ KernelTests/ Core/ Test/ AssertMailTraitTest.php 
- ConfigTranslationUiTest.php in core/modules/ config_translation/ tests/ src/ Functional/ ConfigTranslationUiTest.php 
- ContactPersonalTest.php in core/modules/ contact/ tests/ src/ Functional/ ContactPersonalTest.php 
- ContactSitewideTest.php in core/modules/ contact/ tests/ src/ Functional/ ContactSitewideTest.php 
- EmailActionTest.php in core/tests/ Drupal/ KernelTests/ Core/ Action/ EmailActionTest.php 
- MailCaptureTest.php in core/tests/ Drupal/ FunctionalTests/ MailCaptureTest.php 
- RestRegisterUserTest.php in core/modules/ hal/ tests/ src/ Functional/ user/ RestRegisterUserTest.php 
- SiteMaintenanceTest.php in core/modules/ system/ tests/ src/ Functional/ System/ SiteMaintenanceTest.php 
- UserAdminTest.php in core/modules/ user/ tests/ src/ Functional/ UserAdminTest.php 
- UserCreateTest.php in core/modules/ user/ tests/ src/ Functional/ UserCreateTest.php 
- UserLoginHttpTest.php in core/modules/ user/ tests/ src/ Functional/ UserLoginHttpTest.php 
- UserLoginTest.php in core/modules/ user/ tests/ src/ Functional/ UserLoginTest.php 
- UserMailNotifyTest.php in core/modules/ user/ tests/ src/ Kernel/ UserMailNotifyTest.php 
- UserPasswordResetTest.php in core/modules/ user/ tests/ src/ FunctionalJavascript/ UserPasswordResetTest.php 
- UserPasswordResetTest.php in core/modules/ user/ tests/ src/ Functional/ UserPasswordResetTest.php 
- UserRegistrationRestTest.php in core/modules/ user/ tests/ src/ Functional/ UserRegistrationRestTest.php 
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