Fix test_site from modifying sysconfig._CONFIG_VARS.

diff --git a/Lib/test/test_site.py b/Lib/test/test_site.py
index ba426494fb4ee4b3a9f66dd781f0b9a4943027c1..29286c710b577b420bac89df93d99f148e5e2070 100644 (file)
--- a/Lib/test/test_site.py
+++ b/Lib/test/test_site.py
@@ -39,6 +39,7 @@ class HelperFunctionsTests(unittest.TestCase):
         self.old_base = site.USER_BASE
         self.old_site = site.USER_SITE
         self.old_prefixes = site.PREFIXES
+        self.original_vars = sysconfig._CONFIG_VARS
         self.old_vars = copy(sysconfig._CONFIG_VARS)
 
     def tearDown(self):
@@ -47,7 +48,9 @@ class HelperFunctionsTests(unittest.TestCase):
         site.USER_BASE = self.old_base
         site.USER_SITE = self.old_site
         site.PREFIXES = self.old_prefixes
-        sysconfig._CONFIG_VARS = self.old_vars
+        sysconfig._CONFIG_VARS = self.original_vars
+        sysconfig._CONFIG_VARS.clear()
+        sysconfig._CONFIG_VARS.update(self.old_vars)
 
     def test_makepath(self):
         # Test makepath() have an absolute path for its first return value