Expand test for the runas fix in sudo 1.9.14

We also need to verify that the user is not allowed to run commands
with just their own group if sudoers doesn't explicitly permit it.

Author: millert

plugins/sudoers/regress/testsudoers/test23.out.ok

@@ -1,3 +1,18 @@
+Testing with user and group set to invoking user:
+
+Parses OK
+
+Entries for user admin:
+
+ALL = (root) /bin/ls
+	host  allowed
+	runas unmatched
+
+Password required
+
+Command unmatched
+Testing with no user and group set to invoking user:
+
 Parses OK
 
 Entries for user admin:

plugins/sudoers/regress/testsudoers/test23.sh

@@ -9,9 +9,18 @@
 
 exec 2>&1
 
+echo "Testing with user and group set to invoking user:"
+echo ""
 $TESTSUDOERS -u admin -g admin -p ${TESTDIR}/passwd -P ${TESTDIR}/group \
     admin /bin/ls <<'EOF'
 admin ALL = (root) /bin/ls
 EOF
 
+echo "Testing with no user and group set to invoking user:"
+echo ""
+$TESTSUDOERS -g admin -p ${TESTDIR}/passwd -P ${TESTDIR}/group \
+    admin /bin/ls <<'EOF'
+admin ALL = (root) /bin/ls
+EOF
+
 exit 0