Installing a Test Certificate on a Test Computer
The test certificates that are used to embed signatures in driver files and to sign a driver package's catalog file must be added to the Trusted Root Certification Authorities certificate store and the Trusted Publishers certificate store. You can manually add a test certificate to these certificate stores by using the CertMgr tool, as described in Using CertMgr to Install Test Certificates on a Test Computer.
You can also configure the default domain policy to automatically deploy a test certificate on computers in a domain, as described in Deploying a Test Certificate by Using the Default Domain Policy.