1 files changed, 11 insertions, 5 deletions

diff --git a/src/mailman/bin/master.py b/src/mailman/bin/master.py
index 5ffe59647..ebf08ba11 100644
--- a/src/mailman/bin/master.py
+++ b/src/mailman/bin/master.py
@@ -45,6 +45,12 @@ LOCK_LIFETIME = timedelta(days=1, hours=6)
 SECONDS_IN_A_DAY = 86400
 SUBPROC_START_WAIT = timedelta(seconds=20)
 
+# Environment variables to forward into subprocesses.
+PRESERVE_ENVS = (
+    'COVERAGE_PROCESS_START',
+    'MAILMAN_EXTRA_TESTING_CFG',
+    )
+
 
 
 class ScriptOptions(Options):
@@ -373,11 +379,11 @@ class Loop:
         var_dir = os.environ.get('MAILMAN_VAR_DIR')
         if var_dir is not None:
             env['MAILMAN_VAR_DIR'] = var_dir
-        # For the testing framework, if this environment variable is set, pass
-        # it on to the subprocess.
-        coverage_env = os.environ.get('COVERAGE_PROCESS_START')
-        if coverage_env is not None:
-            env['COVERAGE_PROCESS_START'] = coverage_env
+        # For the testing framework, if these environment variables are set,
+        # pass them on to the subprocess.
+        for envvar in PRESERVE_ENVS:
+            if envvar in os.environ:
+                env[envvar] = os.environ[envvar]
         args.append(env)
         os.execle(*args)
         # We should never get here.