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--- dir-from ---
#test(direction.from(left), ltr)
#test(direction.from(right), rtl)
#test(direction.from(top), ttb)
#test(direction.from(bottom), btt)
--- dir-from-invalid ---
// Error: 17-23 cannot convert this alignment to a side
#direction.from(center)
--- dir-to ---
#test(direction.to(left), rtl)
#test(direction.to(right), ltr)
#test(direction.to(top), btt)
#test(direction.to(bottom), ttb)
-- dir-to-invalid ---
// Error: 15-21 cannot convert this alignment to a side
#direction.to(center)
--- dir-axis ---
#test(ltr.axis(), "horizontal")
#test(rtl.axis(), "horizontal")
#test(ttb.axis(), "vertical")
#test(btt.axis(), "vertical")
--- dir-sign ---
#test(ltr.sign(), 1)
#test(rtl.sign(), -1)
#test(ttb.sign(), 1)
#test(btt.sign(), -1)
--- 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)
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