process-test-quoted-batfile fails on my Windows 10 Home

F process-test-quoted-batfile
    Check that Emacs hides CreateProcess deficiency (bug#18745).
    (ert-test-failed
     ((should
       (string=
(buffer-string)
"arg1 = \"x &y\", arg2 =
"))
      :form
      (string= "arg1 = \"x &y\", arg2 =
" "arg1 = \"x &y\", arg2 =
")
      :value nil))

The result lacks the trailing space before the \n.

"arg1 = \"x &y\", arg2 =\n"

instead of

"arg1 = \"x &y\", arg2 = \n"