Upgrade Tests
Upgrade tests provide a basic sanity check on the DB upgrade logic – they ensure that the upgrade process does not cause a crash when upgrading from an older version.
They are suitable for checking issues in the DB upgrade logic – but do not check for issues in the administrative experience or in the CMS-integration.
Upgrade tests are run daily on the Jenkins continuous integration server.
Locally you can use civi-test-run to run the same upgrade tests as Jenkins would.