[PATCH 3 of 3] test-sshserver: stabilize for Windows

[Matt Harbison]

# HG changeset patch
# User Matt Harbison <matt_harbison at yahoo.com>
# Date 1516476100 18000
#      Sat Jan 20 14:21:40 2018 -0500
# Node ID 1dd5724664ab53e0cf2a69809bb3f4158d4e30d7
# Parent  ebb75443969ae8b4c750b7f082387bb126e2978f
test-sshserver: stabilize for Windows

diff --git a/tests/test-sshserver.py b/tests/test-sshserver.py
--- a/tests/test-sshserver.py
+++ b/tests/test-sshserver.py
@@ -7,6 +7,7 @@
 
 from mercurial import (
     sshserver,
+    util,
     wireproto,
 )
 
@@ -41,4 +42,6 @@
         self.ferr = io.BytesIO()
 
 if __name__ == '__main__':
+    # Don't call into msvcrt to set BytesIO to binary mode
+    util.setbinary = lambda fp: True
     silenttestrunner.main(__name__)