SUIT CSS: ButtonGroup component tests

.ButtonGroup

renders vertically and full-width

removes default list styles from the root element

.ButtonGroup.ButtonGroup--hz

renders horizontally and buttons shrink wrap

.ButtonGroup.ButtonGroup--borderCollapse (requires plugin)

overlaps adjacent borders, removes border-radius from adjacent borders, places the active button on top

doesn't have an affect on single-item groups

.ButtonGroup.ButtonGroup--hz.ButtonGroup--borderCollapse (requires plugin)

overlaps adjacent borders, removes border-radius from adjacent borders, places the active button on top

doesn't have an affect on single-item groups