TST: add web tests for the group/ungroup regression button
TST: add web tests for the group/ungroup regression button

spacetelescope/asv,airspeed-velocity/asv,spacetelescope/asv,airspeed-velocity/asv,airspeed-velocity/asv,airspeed-velocity/asv,spacetelescope/asv,spacetelescope/asv