Add a test case for non authorized set locale:

This is prompted by issue #3, but it does not really test that there
is no segmentation fault.

tests/Makefile.am

@@ -93,6 +93,7 @@ EXTRA_DIST = $(TESTS) \
 	     ref-localed.sh \
 	     unref-localed.sh \
 	     scratch/locale-read-result1 \
+	     scratch/locale-write-result1 \
 	     scratch/keyboard-read-result1 \
 	     scratch/keyboard-read-result2 \
 	     scratch/keyboard-write-result1 \

tests/locale-write-no-file

@@ -17,9 +17,23 @@ cmp scratch/locale << EOF
 LANG='fr_FR.UTF-8'
 LC_TIME='fr_FR.UTF-8'
 EOF
-
 RES=$?
-rm scratch/locale
+
+if [ $RES = 0 ]; then
+    echo PASS: write-locale-no-file
+    rm scratch/locale
+    gdbus call \
+      --system \
+      --dest org.freedesktop.locale1 \
+      --object-path /org/freedesktop/locale1 \
+      --method org.freedesktop.locale1.SetLocale \
+      "['LANG=fr_FR.UTF-8', 'LC_TIME=fr_FR.UTF-8']" \
+      false |& cmp ${srcdir}/scratch/locale-write-result1
+    RES=$?
+fi
+
+#rm -f scratch/error
+. ${srcdir}/unref-localed.sh
 . ${srcdir}/unref-polkit.sh
 . ${srcdir}/unref-dbus.sh
 exit $RES

tests/scratch/locale-write-result1

@@ -0,0 +1 @@
+Error: GDBus.Error:org.freedesktop.PolicyKit1.Error.NotAuthorized: Authorizing for 'org.freedesktop.locale1.set-locale': not authorized