Hello Tim,
Thank you for reaching out to us.
Please note that this forum channel can only provide assistance to issues/concerns related to the AdWords API / Google Ads API.
As far as the documentation is concern, there is no such document related to the API's unit testing. However, since this is more on the testing side, you can reach out to the client library owners instead. You can navigate by selecting your Client library and select on the View on GitHub link. In the GitHub link, navigate to the Issues tab (e.g using Java Client Library). Once you've receive suggestions from the client library owners, you can then make use of Test accounts for your unit testing.
Regards,
 |
| Mark Kevin Albios |
| Google Ads API Team |
|
|
| |

ref:_00D1U1174p._5004Q2VQU9T:ref