Issue #3271802 by AdamPS: Automatic test framework

src/Address.php

src/Email.php

tests/modules/symfony_mailer_test/src/MailerTest.php

tests/modules/symfony_mailer_test/src/MailerTestService.php

...es/symfony_mailer_test/src/MailerTestServiceInterface.php

tests/modules/symfony_mailer_test/src/MailerTestTrait.php

tests/modules/symfony_mailer_test/symfony_mailer_test.module

...ules/symfony_mailer_test/symfony_mailer_test.services.yml

tests/src/Functional/SymfonyMailerTestBase.php

tests/src/Functional/TestEmailTest.php