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-rw-r--r--Lib/test/test_long.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/Lib/test/test_long.py b/Lib/test/test_long.py
index 25abcc8..6a1f117 100644
--- a/Lib/test/test_long.py
+++ b/Lib/test/test_long.py
@@ -77,6 +77,8 @@ def getran2(ndigits):
def test_division_2(x, y):
q, r = divmod(x, y)
q2, r2 = x/y, x%y
+ pab, pba = x*y, y*x
+ check(pab == pba, "multiplication does not commute for", x, y)
check(q == q2, "divmod returns different quotient than / for", x, y)
check(r == r2, "divmod returns different mod than % for", x, y)
check(x == q*y + r, "x != q*y + r after divmod on", x, y)