[ostree] Add test for the behavior of --help

[Owen Taylor <otaylor src gnome org>]

commit 7fce7e0338f52a328387abf6b46105547476710e
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Thu Sep 25 03:05:45 2014 -0400

    Add test for the behavior of --help
    
    Recursive over ostree and all subcommands, and check that --help
    is supported, properly outputs to standard out, and exits
    with a 0 exit status. Check that for commands with subcommands,
    they produce the help output to standard error when run with no arguments.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=737194

 Makefile-tests.am  |    1 +
 tests/libtest.sh   |    6 +++++
 tests/test-help.sh |   59 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 66 insertions(+), 0 deletions(-)
---
diff --git a/Makefile-tests.am b/Makefile-tests.am
index 03a2ff6..5d07e9e 100644
--- a/Makefile-tests.am
+++ b/Makefile-tests.am
@@ -27,6 +27,7 @@ testfiles = test-basic \
        test-archivez \
        test-remote-add \
         test-commit-sign \
+       test-help \
        test-libarchive \
        test-pull-archive-z \
        test-pull-corruption \
diff --git a/tests/libtest.sh b/tests/libtest.sh
index 7d726a5..e9d4450 100644
--- a/tests/libtest.sh
+++ b/tests/libtest.sh
@@ -78,6 +78,12 @@ assert_file_has_content () {
     fi
 }
 
+assert_file_empty() {
+    if test -s "$1"; then
+       echo 1>&2 "File '$1' is not empty"; exit 1
+    fi
+}
+
 setup_test_repository () {
     mode=$1
     shift
diff --git a/tests/test-help.sh b/tests/test-help.sh
new file mode 100755
index 0000000..db7f65d
--- /dev/null
+++ b/tests/test-help.sh
@@ -0,0 +1,59 @@
+#!/bin/bash
+#
+# Copyright (C) 2014 Owen Taylor <otaylor redhat com>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+set -e
+
+. $(dirname $0)/libtest.sh
+
+echo "1..1"
+
+echo "Testing:" 1>&2
+test_recursive() {
+    local cmd=$1
+    echo "$cmd" 1>&2
+    $cmd --help 1>out 2>err
+    # --help message goes to standard output
+    assert_file_has_content out "[Uu]sage"
+    assert_file_has_content out "$cmd"
+    assert_file_empty err
+    builtins=`sed -n '/^Builtin commands/,/^[^ ]/p' <out | tail -n +2`
+    if [ "$builtins" != "" ] ; then
+        # A command with subcommands
+        # Running the command without a subcommand should produce the help output, but fail
+        set +e
+        $cmd 1>out 2>err
+        if [ $? = 0 ] ; then
+           echo 1>&2 "missing subcommand but 0 exit status"; exit 1
+        fi
+        set -e
+        # error message and usage goes to standard error
+        assert_file_has_content err "[Uu]sage"
+        assert_file_has_content err "$cmd"
+        assert_file_has_content err "Builtin commands"
+        assert_file_empty out
+
+        for subcmd in $builtins ; do
+            test_recursive "$cmd $subcmd"
+        done
+    fi
+}
+
+test_recursive ostree
+
+echo "ok help option is properly supported"