The Testament of Jacob is a work now regarded as part of the Old Testament apocrypha. It is often treated as one of a trio of very similar works, the other two of which are the Testament of Abraham and Testament of Isaac, though there is no reason to assume that they were originally a single work.
The Testament of Jacob is now recognized as part of the Old Testament apocrypha, often grouped with the Testaments of Abraham and Isaac, which share similar themes and content.