Add support for clearing router gateway

This patch adds the support to clear the gateway information
from a router.

Change-Id: I446c556750f080a6fc21fea8f531fd71838d648a
Implements: blueprint neutron-client-advanced-router
Partially-Implements: blueprint network-commands-options

1 files changed, 13 insertions, 0 deletions

diff --git a/openstackclient/tests/unit/network/v2/test_router.py b/openstackclient/tests/unit/network/v2/test_router.py
index 9183cb63..a24a34c5 100644
--- a/openstackclient/tests/unit/network/v2/test_router.py
+++ b/openstackclient/tests/unit/network/v2/test_router.py
@@ -1021,3 +1021,16 @@ class TestUnsetRouter(TestRouter):
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
         self.assertRaises(exceptions.CommandError,
                           self.cmd.take_action, parsed_args)
+
+    def test_unset_router_external_gateway(self):
+        arglist = [
+            '--external-gateway',
+            self._testrouter.name,
+        ]
+        verifylist = [('external_gateway', True)]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+        result = self.cmd.take_action(parsed_args)
+        attrs = {'external_gateway_info': {}}
+        self.network.update_router.assert_called_once_with(
+            self._testrouter, **attrs)
+        self.assertIsNone(result)