hope_list:unique_preserve_order/1 property test

[hope.git] / test / hope_list_SUITE.erl

diff --git a/test/hope_list_SUITE.erl b/test/hope_list_SUITE.erl
index 751157d..819c4fc 100644 (file)
--- a/test/hope_list_SUITE.erl
+++ b/test/hope_list_SUITE.erl
@@ -1,5 +1,7 @@
 -module(hope_list_SUITE).
 
+-include_lib("proper/include/proper.hrl").
+
 %% Callbacks
 -export(
     [ all/0
@@ -14,6 +16,8 @@
 
 -define(GROUP , hope_list).
 
+-define(PROPTEST(A), true = proper:quickcheck(A())).
+
 
 %% ============================================================================
 %% Common Test callbacks
@@ -35,11 +39,12 @@ groups() ->
 %% =============================================================================
 
 t_unique_preserve_order(_Cfg) ->
-    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).