tests: ensure that chmod, chgrp and chown honor --silent

* tests/chmod/silent: New file, to test all three programs.
* tests/Makefile.am (TESTS): Add chmod/silent.
* NEWS (Bug fixes): Mention this.
The bug was introduced in 96a5d2ce6a.

NEWS

@@ -10,6 +10,9 @@ GNU coreutils NEWS                                    -*- outline -*-
 
 ** Bug fixes
 
+  chgrp, chmod, chown --silent (--quiet, -f) no longer print some diagnostics
+  [bug introduced in coreutils-5.1]
+
   cp uses much less memory in some situations
 
   du --files0-from=FILE no longer reads all of FILE into RAM before

tests/Makefile.am

@@ -238,6 +238,7 @@ TESTS =						\
   chmod/inaccessible				\
   chmod/octal					\
   chmod/setgid					\
+  chmod/silent					\
   chmod/thru-dangling				\
   chmod/umask-x					\
   chmod/usage					\

tests/chmod/silent

@@ -0,0 +1,36 @@
+#!/bin/sh
+# ensure that chgrp, chmod, chown -f don't print some diagnostics
+
+# Copyright (C) 2008 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+if test "$VERBOSE" = yes; then
+  set -x
+  chgrp --version
+  chmod --version
+  chown --version
+fi
+
+. $srcdir/test-lib.sh
+
+fail=0
+chmod -f 0   no-such 2> out && fail=1
+chgrp -f 0   no-such 2>> out && fail=1
+chown -f 0:0 no-such 2>> out && fail=1
+touch exp || fail=1
+
+compare out exp || fail=1
+
+Exit $fail