From: Guido van Rossum <guido@python.org>
Date: Mon, 10 Apr 2000 17:41:37 +0000 (+0000)
Subject: Christian Tismer: added test to ensure that multiplication commutes.
X-Git-Tag: v1.6a2~33
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=6e277cf7deb76ec83e8fe67ee78e9d9cb7977814;p=thirdparty%2FPython%2Fcpython.git

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 25abcc836584..6a1f1173325d 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)