From 8141c38ce19a3c85cdb99091392c85226133da10 Mon Sep 17 00:00:00 2001
From: Thales Macedo Garitezi <thalesmg@gmail.com>
Date: Tue, 22 Feb 2022 17:57:00 -0300
Subject: [PATCH] test(fix): fix flaky prop
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Failing when duplicate elements were being generated.

```
 An exception was raised: error:{assertEqual,
                                [{module,emqx_hooks_SUITE},
                                 {line,65},
                                 {expression,"Order"},
                                 {expected,
                                  [{5,'',''},
                                   {5,'',''},
                                   {4,'\223',''},
                                   {2,'}Ijrµ\036',''}]},
                                 {value,
                                  [{5,'',''},
                                   {4,'\223',''},
                                   {2,'}Ijrµ\036',''}]}]}.
```
---
 apps/emqx/test/emqx_hooks_SUITE.erl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/apps/emqx/test/emqx_hooks_SUITE.erl b/apps/emqx/test/emqx_hooks_SUITE.erl
index eb0189b42..4c3414a71 100644
--- a/apps/emqx/test/emqx_hooks_SUITE.erl
+++ b/apps/emqx/test/emqx_hooks_SUITE.erl
@@ -55,8 +55,9 @@ add_hook_order_prop() ->
                              (Prio1 =:= Prio2 andalso {M1, F1} =< {M2, F2})
                  end,
     ?FORALL(
-       Hooks, list({range(-1, 5), atom(), atom()}),
+       Hooks0, list({range(-1, 5), atom(), atom()}),
        try
+           Hooks = sets:to_list(sets:from_list(Hooks0)),
            {ok, _} = emqx_hooks:start_link(),
            [emqx:hook(prop_hook, {M, F, []}, Prio) || {Prio, M, F} <- Hooks],
            Callbacks = emqx_hooks:lookup(prop_hook),