1 files changed, 1 insertions, 14 deletions

diff --git a/src/mailman/tests/test_configfile.py b/src/mailman/tests/test_configfile.py
index 2d418bb54..9406d9ca2 100644
--- a/src/mailman/tests/test_configfile.py
+++ b/src/mailman/tests/test_configfile.py
@@ -25,6 +25,7 @@ import unittest
 
 from contextlib import contextmanager
 from mailman.core.initialize import search_for_configuration_file
+from mailman.testing.helpers import hackenv
 
 
 # Here are a couple of context managers that make our tests easier to read.
@@ -39,20 +40,6 @@ def fakedirs(path):
 
 
 @contextmanager
-def hackenv(envar, new_value):
-    """Hack the environment temporarily, then reset it."""
-    old_value = os.getenv(envar)
-    os.environ[envar] = new_value
-    try:
-        yield
-    finally:
-        if old_value is None:
-            del os.environ[envar]
-        else:
-            os.environ[envar] = old_value
-
-
-@contextmanager
 def chdir(new_cwd):
     """Change to the directory, then back again."""
     old_cwd = os.getcwd()