Covenant

Covenant is a location and possible settlement in the Commonwealth in Fallout 4.

Appearances
Covenant only appears in Fallout 4.

Behind the scenes
The SAFE Test, the test to get into Covenant, is actually the G.O.A.T. test from Fallout 3 having all the questions, but a few have been modified.

This is also a pretty blatant reference to the Voight-Kampff test from Blade Runner/Do Androids Dream of Electric Sheep.

Settlement
It is possible to settle the Covenant if you complete the Human Error mission and side against the Covenant. Returning after completion will initiate a battle with the residents and settlers in which you can use the workshop once you emerge victorious.