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-rw-r--r--Lib/test/test_threaded_import.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/Lib/test/test_threaded_import.py b/Lib/test/test_threaded_import.py
index 0528b13..93bfb2a 100644
--- a/Lib/test/test_threaded_import.py
+++ b/Lib/test/test_threaded_import.py
@@ -68,6 +68,7 @@ class Finder:
# Simulate some thread-unsafe behaviour. If calls to find_module()
# are properly serialized, `x` will end up the same as `numcalls`.
# Otherwise not.
+ assert imp.lock_held()
with self.lock:
self.numcalls += 1
x = self.x