Add a note why test_chunksize_fails() covers multiple test scenarios

Follow-up to matplotlib#23413.
wsykala · Jul 12, 2022 · cd31e3a · cd31e3a
1 parent ec491a5
commit cd31e3a
Showing 1 changed file with 5 additions and 0 deletions.
diff --git 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