diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index 06fe647..78b123f 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -896,19 +896,50 @@
         class BadInt(int):
             def __mul__(self, other):
                 return Prod()
+            def __rmul__(self, other):
+                return Prod()
+            def __floordiv__(self, other):
+                return Prod()
+            def __rfloordiv__(self, other):
+                return Prod()
 
         class Prod:
+            def __add__(self, other):
+                return Sum()
             def __radd__(self, other):
                 return Sum()
 
         class Sum(int):
             def __divmod__(self, other):
-                # negative remainder
-                return (0, -1)
+                return divmodresult
 
-        timedelta(microseconds=BadInt(1))
-        timedelta(hours=BadInt(1))
-        timedelta(weeks=BadInt(1))
+        for divmodresult in [None, (), (0, 1, 2), (0, -1)]:
+            with self.subTest(divmodresult=divmodresult):
+                # The following examples should not crash.
+                try:
+                    timedelta(microseconds=BadInt(1))
+                except TypeError:
+                    pass
+                try:
+                    timedelta(hours=BadInt(1))
+                except TypeError:
+                    pass
+                try:
+                    timedelta(weeks=BadInt(1))
+                except (TypeError, ValueError):
+                    pass
+                try:
+                    timedelta(1) * BadInt(1)
+                except (TypeError, ValueError):
+                    pass
+                try:
+                    BadInt(1) * timedelta(1)
+                except TypeError:
+                    pass
+                try:
+                    timedelta(1) // BadInt(1)
+                except TypeError:
+                    pass
 
 
 #############################################################################