Watch Testament of Youth for Free: How to Stream the Movie Online at 123Movies. . Testament of Youth is a powerful story of love, war and remembrance, based on the First World War memoir by Vera Brittain, which has become the classic testimony of that war from a woman’s point of view. A searing journey from youthful hopes and dreams to the edge of despair and back again, it’s a film about young love, the futility of war and how to make sense of the darkest times.