--- dir-axis ---
// Test direction methods.
#test(ltr.axis(), "horizontal")
#test(rtl.axis(), "horizontal")
#test(ttb.axis(), "vertical")
#test(btt.axis(), "vertical")

--- dir-start ---
#test(ltr.start(), left)
#test(rtl.start(), right)
#test(ttb.start(), top)
#test(btt.start(), bottom)

--- dir-end ---
#test(ltr.end(), right)
#test(rtl.end(), left)
#test(ttb.end(), bottom)
#test(btt.end(), top)

--- dir-inv ---
#test(ltr.inv(), rtl)
#test(rtl.inv(), ltr)
#test(ttb.inv(), btt)
#test(btt.inv(), ttb)