From cd31e3a126e6a65cb1da5815a64fb3c5fa55c4a7 Mon Sep 17 00:00:00 2001
From: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>
Date: Tue, 12 Jul 2022 22:56:02 +0200
Subject: [PATCH] Add a note why test_chunksize_fails() covers multiple test
 scenarios

Follow-up to #23413.
---
 lib/matplotlib/tests/test_agg.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/matplotlib/tests/test_agg.py b/lib/matplotlib/tests/test_agg.py
index 7a41f6603777..ac13befcb3e4 100644
--- a/lib/matplotlib/tests/test_agg.py
+++ b/lib/matplotlib/tests/test_agg.py
@@ -276,6 +276,11 @@ def test_draw_path_collection_error_handling():
 
 
 def test_chunksize_fails():
+    # NOTE: This test covers multiple independent test scenarios in a single
+    #       function, because each scenario uses ~2GB of memory and we don't
+    #       want parallel test executors to accidentally run multiple of these
+    #       at the same time.
+
     N = 100_000
     dpi = 500
     w = 5*dpi