diff -r cad62cb3c84c -r 75be14993fda tests/test-bisect.t
--- a/tests/test-bisect.t	Thu Jun 15 14:22:39 2017 -0400
+++ b/tests/test-bisect.t	Tue Jun 20 09:45:02 2017 -0400
@@ -463,12 +463,12 @@
   $ chmod +x script.py
   $ hg bisect -r
   $ hg up -qr tip
-  $ hg bisect --command "python \"$TESTTMP/script.py\" and some parameters"
+  $ hg bisect --command "$PYTHON \"$TESTTMP/script.py\" and some parameters"
   changeset 31:58c80a7c8a40: good
   abort: cannot bisect (no known bad revisions)
   [255]
   $ hg up -qr 0
-  $ hg bisect --command "python \"$TESTTMP/script.py\" and some parameters"
+  $ hg bisect --command "$PYTHON \"$TESTTMP/script.py\" and some parameters"
   changeset 0:b99c7b9c8e11: bad
   changeset 15:e7fa0811edb0: good
   changeset 7:03750880c6b5: good