From 800f67a9654f712df4681d51327200465898e2da Mon Sep 17 00:00:00 2001
From: Diogo Netto <61364108+d-netto@users.noreply.github.com>
Date: Mon, 6 May 2024 01:33:08 -0300
Subject: [PATCH] add test case to check live_bytes doesn't grow arbitrarily on
 String(::Array{UInt8})) (#54371)

Follow-up to https://github.com/JuliaLang/julia/pull/54331.
---
 test/gc.jl | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/test/gc.jl b/test/gc.jl
index e9960bc907438..d8e6fe07d0240 100644
--- a/test/gc.jl
+++ b/test/gc.jl
@@ -28,6 +28,25 @@ function run_pg_size_test()
     @test page_size == (1 << 12) || page_size == (1 << 14)
 end
 
+function issue_54275_alloc_string()
+    String(UInt8['a' for i in 1:10000000])
+end
+
+function issue_54275_test()
+    GC.gc(true)
+    baseline = Base.gc_live_bytes()
+    live_bytes_has_grown_too_much = false
+    for _ in 1:10
+        issue_54275_alloc_string()
+        GC.gc(true)
+        if Base.gc_live_bytes() - baseline > 1_000_000
+            live_bytes_has_grown_too_much = true
+            break
+        end
+    end
+    @test !live_bytes_has_grown_too_much
+end
+
 # !!! note:
 #     Since we run our tests on 32bit OS as well we confine ourselves
 #     to parameters that allocate about 512MB of objects. Max RSS is lower
@@ -44,6 +63,10 @@ end
     run_pg_size_test()
 end
 
+@testset "issue-54275" begin
+    issue_54275_test()
+end
+
 @testset "Base.GC docstrings" begin
     @test isempty(Docs.undocumented_names(GC))
 end