ipatests: add test for group creation with GID and nonposix option

Add test to ensure group creation fails when passing the --nonposix
option and a GID number at the same time. Failure shows a message
to warn the user that this is not allowed.

Signed-off-by: Antonio Torres <antorres@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>

ipatests/test_xmlrpc/test_group_plugin.py

@@ -388,6 +388,15 @@ class TestNonexistentGroup(XMLRPC_test):
 
 @pytest.mark.tier1
 class TestNonposixGroup(XMLRPC_test):
+    def test_create_nonposix_with_gid(self, group):
+        """ Try to create non-posix group with GID """
+        command = group.make_create_command(**dict(nonposix=True,
+                                                   gidnumber=10011))
+
+        with raises_exact(errors.ObjectclassViolation(
+                info=u'attribute "gidNumber" not allowed with --nonposix')):
+            command()
+
     def test_create_nonposix(self, group):
         """ Create a non-posix group """
         group.track_create()