--- a/tests/test-notify-changegroup.t	Tue Sep 18 22:40:03 2018 -0400
+++ b/tests/test-notify-changegroup.t	Tue Sep 18 23:47:21 2018 -0400
@@ -39,7 +39,7 @@
 push
 
   $ hg --traceback --cwd b push ../a 2>&1 |
-  >     $PYTHON -c 'from __future__ import print_function ; import sys,re; print(re.sub("\n\t", " ", sys.stdin.read()), end="")'
+  >     "$PYTHON" -c 'from __future__ import print_function ; import sys,re; print(re.sub("\n\t", " ", sys.stdin.read()), end="")'
   pushing to ../a
   searching for changes
   adding changesets
@@ -93,7 +93,7 @@
 unbundle with correct source
 
   $ hg --config notify.sources=unbundle --cwd a unbundle ../test.hg 2>&1 |
-  >     $PYTHON -c 'from __future__ import print_function ; import sys,re; print(re.sub("\n\t", " ", sys.stdin.read()), end="")'
+  >     "$PYTHON" -c 'from __future__ import print_function ; import sys,re; print(re.sub("\n\t", " ", sys.stdin.read()), end="")'
   adding changesets
   adding manifests
   adding file changes
@@ -169,7 +169,7 @@
 push
 
   $ hg --traceback --cwd b --config notify.fromauthor=True push ../a 2>&1 |
-  >     $PYTHON -c 'from __future__ import print_function ; import sys,re; print(re.sub("\n\t", " ", sys.stdin.read()), end="")'
+  >     "$PYTHON" -c 'from __future__ import print_function ; import sys,re; print(re.sub("\n\t", " ", sys.stdin.read()), end="")'
   pushing to ../a
   searching for changes
   adding changesets