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-rw-r--r--erts/emulator/test/map_SUITE.erl45
1 files changed, 45 insertions, 0 deletions
diff --git a/erts/emulator/test/map_SUITE.erl b/erts/emulator/test/map_SUITE.erl
index 04c12d3e14..bc649d5808 100644
--- a/erts/emulator/test/map_SUITE.erl
+++ b/erts/emulator/test/map_SUITE.erl
@@ -650,6 +650,17 @@ t_map_size(Config) when is_list(Config) ->
Ks = [build_key(fun(K) -> <<1,K:32,1>> end,I)||I<-lists:seq(1,100)],
ok = build_and_check_size(Ks,0,#{}),
+ %% try deep collisions
+ %% statistically we get another subtree at 50k -> 100k elements
+ %% Try to be nice and don't use too much memory in the testcase,
+
+ N = 500000,
+ Is = lists:seq(1,N),
+ N = map_size(maps:from_list([{I,I}||I<-Is])),
+ N = map_size(maps:from_list([{<<I:32>>,I}||I<-Is])),
+ N = map_size(maps:from_list([{integer_to_list(I),I}||I<-Is])),
+ N = map_size(maps:from_list([{float(I),I}||I<-Is])),
+
%% Error cases.
{'EXIT',{badarg,_}} = (catch map_size([])),
{'EXIT',{badarg,_}} = (catch map_size(<<1,2,3>>)),
@@ -1820,6 +1831,40 @@ t_bif_map_merge(Config) when is_list(Config) ->
#{4 := integer, 18446744073709551629 := wat, float := 3.3, int := 3,
{1,2} := "tuple", "hi" := "hello again", <<"key">> := <<"value">>} = maps:merge(M0,M1),
+ %% try deep collisions
+ N = 150000,
+ Is = lists:seq(1,N),
+ M2 = maps:from_list([{I,I}||I<-Is]),
+ 150000 = maps:size(M2),
+ M3 = maps:from_list([{<<I:32>>,I}||I<-Is]),
+ 150000 = maps:size(M3),
+ M4 = maps:merge(M2,M3),
+ 300000 = maps:size(M4),
+ M5 = maps:from_list([{integer_to_list(I),I}||I<-Is]),
+ 150000 = maps:size(M5),
+ M6 = maps:merge(M4,M5),
+ 450000 = maps:size(M6),
+ M7 = maps:from_list([{float(I),I}||I<-Is]),
+ 150000 = maps:size(M7),
+ M8 = maps:merge(M7,M6),
+ 600000 = maps:size(M8),
+
+ #{ 1 := 1, "1" := 1, <<1:32>> := 1 } = M8,
+ #{ 10 := 10, "10" := 10, <<10:32>> := 10 } = M8,
+ #{ 100 := 100, "100" := 100, <<100:32>> := 100 } = M8,
+ #{ 1000 := 1000, "1000" := 1000, <<1000:32>> := 1000 } = M8,
+ #{ 10000 := 10000, "10000" := 10000, <<10000:32>> := 10000 } = M8,
+ #{ 100000 := 100000, "100000" := 100000, <<100000:32>> := 100000 } = M8,
+
+ %% overlapping
+ M8 = maps:merge(M2,M8),
+ M8 = maps:merge(M3,M8),
+ M8 = maps:merge(M4,M8),
+ M8 = maps:merge(M5,M8),
+ M8 = maps:merge(M6,M8),
+ M8 = maps:merge(M7,M8),
+ M8 = maps:merge(M8,M8),
+
%% error case
{'EXIT',{badarg,[{maps,merge,_,_}|_]}} = (catch maps:merge((1 bsl 65 + 3), <<>>)),
{'EXIT',{badarg,[{maps,merge,_,_}|_]}} = (catch maps:merge(<<>>, id(#{ a => 1}))),