--- a/tests/run-tests.py	Tue Aug 24 21:25:35 2021 +0200
+++ b/tests/run-tests.py	Mon Aug 02 21:10:42 2021 -0400
@@ -1554,6 +1554,8 @@
             hgrc.write(b'merge = internal:merge\n')
             hgrc.write(b'mergemarkers = detailed\n')
             hgrc.write(b'promptecho = True\n')
+            dummyssh = os.path.join(self._testdir, b'dummyssh')
+            hgrc.write(b'ssh = "%s" "%s"\n' % (PYTHON, dummyssh))
             hgrc.write(b'timeout.warn=15\n')
             hgrc.write(b'[chgserver]\n')
             hgrc.write(b'idletimeout=60\n')