- ListAGiven = [a, a, g, b, f, c, a, d, a, e, f, d],
- ListBGiven = "australia",
- ListAExpected = [a, g, b, f, c, d, e],
- ListBExpected = "austrli",
- ListAComputed = hope_list:unique_preserve_order(ListAGiven),
- ListBComputed = hope_list:unique_preserve_order(ListBGiven),
- ListAComputed = ListAExpected,
- ListBComputed = ListBExpected.
+ ?PROPTEST(prop_unique_preserve_order).
+
+prop_unique_preserve_order() ->
+ ?FORALL(L, list(),
+ begin
+ Duplicates = L -- lists:usort(L),
+ hope_list:unique_preserve_order(L) ==
+ lists:reverse(lists:reverse(L) -- Duplicates)
+ end).