we are trying to install the test dependencies into SugarCRM 7.9 ent.
Yarn can't install SeedBed package because it is not available publicly (or for current SugarCRM Customer/Partner with access to https://github.com/sugarcrm/unit-tests)
A similar problem is with @sugarcrm/thorn but we can resolve it because thorn is available at yarnpkg.com.
What we can do with it? Is SeedBed available for developers?