File 5542-Write-test-case-for-splitmix64_next.patch of Package erlang

From f377ee36e6b84975372d4d9b92146ec0fd6d0fb5 Mon Sep 17 00:00:00 2001
From: Raimo Niskanen <raimo@erlang.org>
Date: Wed, 30 Mar 2022 17:28:16 +0200
Subject: [PATCH 02/11] Write test case for splitmix64_next

---
 lib/stdlib/test/rand_SUITE.erl | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/lib/stdlib/test/rand_SUITE.erl b/lib/stdlib/test/rand_SUITE.erl
index da721ca900..9eed862a66 100644
--- a/lib/stdlib/test/rand_SUITE.erl
+++ b/lib/stdlib/test/rand_SUITE.erl
@@ -35,7 +35,8 @@ all() ->
     [seed, interval_int, interval_float,
      bytes_count,
      api_eq,
-     mcg35_api, mcg35_rem, lcg35_api, exsp_next_api, exsp_jump_api,
+     mcg35_api, mcg35_rem, lcg35_api,
+     exsp_next_api, exsp_jump_api, splitmix64_next_api,
      reference,
      {group, basic_stats},
      {group, distr_stats},
@@ -290,6 +291,22 @@ exsp_jump_api(State, AlgState, N) ->
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+%% Verify splitmix64_next behaviour
+%%
+splitmix64_next_api(Config) when is_list(Config) ->
+    splitmix64_next_api(55555555, 100000, 0).
+
+splitmix64_next_api(_State, 0, X) ->
+    X0 = 13069087632117122295,
+    {X0, X0} = {X, X0},
+    ok;
+splitmix64_next_api(AlgState, N, X)
+  when is_integer(X), 0 =< X, X < 1 bsl 64 ->
+    {X1, NewAlgState} = rand:splitmix64_next(AlgState),
+    splitmix64_next_api(NewAlgState, N - 1, X1).
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
 %% Check that uniform/1 returns values within the proper interval.
 interval_int(Config) when is_list(Config) ->
     Algs = [default|algs()],
-- 
2.34.1