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TaskLocalRNG: test that copy handles the splitmix state #51355

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Merged
oscardssmith merged 1 commit into from
Sep 17, 2023
Merged

TaskLocalRNG: test that copy handles the splitmix state #51355

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23 changes: 23 additions & 0 deletions stdlib/Random/test/runtests.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1065,3 +1065,26 @@ end
end
end
end

@testset "TaskLocalRNG: copy and copy! handle the splitmix state" begin
seeds = rand(RandomDevice(), UInt64, 5)
for seed in seeds
Random.seed!(seed)
rng1 = copy(TaskLocalRNG())
x = fetch(@async rand(UInt64))
rng2 = copy(TaskLocalRNG())
y = fetch(@async rand(UInt64))
rng3 = copy(TaskLocalRNG())
@test x != y
@test rng1 != rng2
Random.seed!(seed)
@test TaskLocalRNG() == rng1
@test x == fetch(@async rand(UInt64))
@test TaskLocalRNG() == rng2
# this should be a no-op:
copy!(TaskLocalRNG(), copy(TaskLocalRNG()))
@test TaskLocalRNG() == rng2
@test y == fetch(@async rand(UInt64))
@test TaskLocalRNG() == rng3
end
end