Part 1

1. do a clean install
2. confirm, that EmailTemplates.TemplateName column size is 255 symbols in the database
3. login to the Admin Console
4. go to the Website & Content → E-mail Templates section
5. attempt to create an e-mail template with name longer than 40 symbols
6. confirm, that e-mail template was created and it's name renamed as entered
7. attempt to create an e-mail template with name longer than 255 symbols
8. confirm, that e-mail template wasn't created and a validation error was shown

Part 2

Repeat same steps as in Part 1, but do an upgrade instead of clean install.