From 0f7f67660653517a5b3ed93e4b658583ff4cd355 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Thu, 4 May 2017 18:10:09 +0200
Subject: test_distutils: test_build_ext uses EnvironGuard (#1458)

Use EnvironGuard on BuildExtTestCase to save/restore os.environ, to fix the
following warning:

Warning -- os.environ was modified by test_distutils

MSVCCompiler.initialize() of distutils.msvc9compiler modifies
os.environ.
---
 Lib/distutils/tests/test_build_ext.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Lib/distutils/tests/test_build_ext.py b/Lib/distutils/tests/test_build_ext.py
index a4494db..a6d2d2e 100644
--- a/Lib/distutils/tests/test_build_ext.py
+++ b/Lib/distutils/tests/test_build_ext.py
@@ -20,6 +20,7 @@ ALREADY_TESTED = False
 
 class BuildExtTestCase(support.TempdirManager,
                        support.LoggingSilencer,
+                       support.EnvironGuard,
                        unittest.TestCase):
     def setUp(self):
         super(BuildExtTestCase, self).setUp()
-- 
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