test(collapse): add unit tests for horizontal classes
test(collapse): add unit tests for horizontal classes

jnizet/ng-bootstrap,fbasso/ng-bootstrap,jnizet/ng-bootstrap,fbasso/ng-bootstrap,jnizet/ng-bootstrap,jnizet/ng-bootstrap,ng-bootstrap/ng-bootstrap,fbasso/ng-bootstrap,ng-bootstrap/ng-bootstrap,ng-bootstrap/ng-bootstrap,ng-bootstrap/ng-bootstrap,fbasso/ng-bootstrap