bpo-33873: regrtest: Add warning on -R 1:3 (GH-7736)
regrtest: Add warning when using less than 3 warmup runs like -R 1:3.
diff --git a/Lib/test/libregrtest/main.py b/Lib/test/libregrtest/main.py
index 3429b37..569d034 100644
--- a/Lib/test/libregrtest/main.py
+++ b/Lib/test/libregrtest/main.py
@@ -462,6 +462,13 @@
or self.tests or self.ns.args)):
self.display_header()
+ if self.ns.huntrleaks:
+ warmup, repetitions, _ = self.ns.huntrleaks
+ if warmup < 3:
+ msg = ("WARNING: Running tests with --huntrleaks/-R and less than "
+ "3 warmup repetitions can give false positives!")
+ print(msg, file=sys.stdout, flush=True)
+
if self.ns.randomize:
print("Using random seed", self.ns.random_seed)