There are multiple definitions - click on the translation that matches your context.

Testat

Substantiv

neolog

auditor's certification of conformity of accounts

Comparative law notes

Germany

This selection is the most descriptive translation if the context is clearly an audit of accounts. Even in that case, we would recommend using it only the first time you encounter "Testat" in running text and then using a more succinct "auditor's report" in the remaining text and headings.