What actors and actresses appeared in Testament of Youth - 1979?

There is no film or television production called "Testament of Youth" from 1979. The film "Testament of Youth" that you might be thinking of was released in 2014 and starred Alicia Vikander, Kit Harington, and Emily Watson.

It's possible you are thinking of a different film or television production altogether. Please provide more details, such as the genre or other key information, to help me identify the correct production.