1 files changed, 16 insertions, 0 deletions
diff --git a/Lib/test/test_bool.py b/Lib/test/test_bool.py
index 7b3a385..bec44d0 100644
--- a/Lib/test/test_bool.py
+++ b/Lib/test/test_bool.py
@@ -354,6 +354,22 @@ class BoolTest(unittest.TestCase):
         self.assertIs(type(False.real), int)
         self.assertIs(type(False.imag), int)
 
+    def test_bool_called_at_least_once(self):
+        class X:
+            def __init__(self):
+                self.count = 0
+            def __bool__(self):
+                self.count += 1
+                return True
+
+        def f(x):
+            if x or True:
+                pass
+
+        x = X()
+        f(x)
+        self.assertGreaterEqual(x.count, 1)
+
 def test_main():
     support.run_unittest(BoolTest)