bug#29712: 26.0.90; Three emacs-26 elisp tests are failing on darwin

[Alan Third <alan@idiocy.org>]

On Fri, Dec 15, 2017 at 09:39:28AM +0100, Michael Albinus wrote:
> "John Wiegley" <johnw@gnu.org> writes:
> 
> > In order to get the ERT tests to pass on my system, I need to disable the
> > following three tests:
> 
> > --- i/test/lisp/net/tramp-tests.el
> > +++ w/test/lisp/net/tramp-tests.el
> > @@ -3636,6 +3636,7 @@ tramp--test-shell-command-to-string-asynchronously
> >  ;; This test is inspired by Bug#27009.
> >  (ert-deftest tramp-test32-environment-variables-and-port-numbers ()
> >    "Check that two connections with separate ports are different."
> > +  (skip-unless (not (eq system-type 'darwin)))
> >    (skip-unless (tramp--test-enabled))
> >    ;; We test it only for the mock-up connection; otherwise there might
> >    ;; be problems with the used ports.
> 
> Committed to the emacs-26 branch.

This particular failure happens because echo under /bin/sh on macOS
doesn’t recognise the -n flag:

    (string-equal "11111" "-n 11111
    ")

It claims to be:

    $ /bin/sh --version
    GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin16)
    Copyright (C) 2007 Free Software Foundation, Inc.
-- 
Alan Third