Le Testament
There are three French one-act plays by this name:
There is a Dutch play called Het Testament, adapted "from the French" by P. van der Velde ()[], which could be version of either, though the likely candidate would be the Radet work.
Le Testament ("The will") by Bernard Le Bovier de Fontenelle
Le Testament ("The will") is a one act comedy by Bernard Le Bovier de Fontenelle()[]
Published in Volume 8 of Oeuvres de Monsiour De Fontenelle by Bernard Brunet, Paris, in 1751.
Facsimile version of Oeuvres de Monsiour De Fontenelle, Google E-book[1]
Le Testament ("The will") by J.B. Radet
Le Testament, is a a vaudeville style one act play ("comédie en un acte et en prose, mêlée de vaudevilles") by J.B. Radet ()[]
First performed at the Theatre de Vaudeville on 5 October, 1797 Published 1797
facsimnile version of the 1797 edition, Google E-book[2]
Het testament, blijspel met zang By Augustin Eugène Scribe, Germain Delavigne
L'Héritière Authors Augustin Eugène Scribe, Germain Delavigne Published 1834