Christian Tismer: added test to ensure that multiplication commutes.
[The test is in a slightly odd place, in test_division_2; but it
exercises the recent change to long_mult(), and that's all we really
ask for. --GvR]
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 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)