The scenes at the National Archives were filmed in the National Archives building in Montreal, at 535 Viger East, on September 18 and 25, 2022.
The office where Bouchard, the protagonist, works is not the real space where the archivists of the National Archives in Montreal work. They are in offices at the back of the room, and visitors cannot see them.
Denys Arcand has hinted that Testament will most likely be his last film.
Was a box-office hit in the province of Quebec in fall of 2023.