add unit test to test tabs can be removed without throwing error
add unit test to test tabs can be removed without throwing error

m5o/bootstrap,peterblazejewicz/bootstrap,inway/bootstrap,tjkohli/bootstrap,bardiharborow/bootstrap,yuyokk/bootstrap,yuyokk/bootstrap,nice-fungal/bootstrap,inway/bootstrap,inway/bootstrap,yuyokk/bootstrap,tagliala/bootstrap,m5o/bootstrap,kvlsrg/bootstrap,zalog/bootstrap,zalog/bootstrap,nice-fungal/bootstrap,stanwmusic/bootstrap,gijsbotje/bootstrap,tjkohli/bootstrap,stanwmusic/bootstrap,coliff/bootstrap,twbs/bootstrap,gijsbotje/bootstrap,yuyokk/bootstrap,GerHobbelt/bootstrap,stanwmusic/bootstrap,GerHobbelt/bootstrap,coliff/bootstrap,gijsbotje/bootstrap,stanwmusic/bootstrap,bardiharborow/bootstrap,zalog/bootstrap,tagliala/bootstrap,bardiharborow/bootstrap,tagliala/bootstrap,bardiharborow/bootstrap,kvlsrg/bootstrap,twbs/bootstrap,nice-fungal/bootstrap,gijsbotje/bootstrap,peterblazejewicz/bootstrap,peterblazejewicz/bootstrap,kvlsrg/bootstrap,GerHobbelt/bootstrap