patch.diff

diff --git a/lib/fog/openstack/requests/network/update_router.rb b/lib/fog/openstack/requests/network/update_router.rb
index af25c77..1012030 100644
--- a/lib/fog/openstack/requests/network/update_router.rb
+++ b/lib/fog/openstack/requests/network/update_router.rb
@@ -53,20 +53,30 @@ module Fog
 
       class Mock
         def update_router(router_id, options = {})
-          raise Fog::Network::OpenStack::NotFound if router_id == 0
+          router = self.data['routers'].find { |r| r['id'] == router_id }
+          raise Fog::Network::OpenStack::NotFound unless router
+          data = { 'router' => router }
+          
+          vanilla_options = [:name, :admin_state_up]
+
+          egi = options[:external_gateway_info]
+          if egi
+            if egi.is_a?(Fog::Network::OpenStack::Network)
+              data['router']['external_gateway_info'] = { 'network_id' => egi.id }
+            elsif egi.is_a?(Hash) and egi['network_id']
+              data['router']['external_gateway_info'] = egi
+            else
+              raise ArgumentError.new('Invalid external_gateway_info attribute')
+            end
+          end
+
+          vanilla_options.reject{ |o| options[o].nil? }.each do |key|
+            data['router'][key] = options[key]
+          end
+         
           response = Excon::Response.new
           response.status = 201
-          data = {
-            'status' => 'ACTIVE',
-            'external_gateway_info' => {
-              'network_id' => '8ca37218-28ff-41cb-9b10-039601ea7e6b'
-            },
-            'name' => 'another_router',
-            'admin_state_up' => true,
-            'tenant_id' => '6b96ff0cb17a4b859e1e575d221683d3',
-            'id' => '8604a0de-7f6b-409a-a47c-a1cc7bc77b2e'
-          }
-          response.body = { 'router' => data }
+          response.body = data
           response
         end
       end
diff --git a/tests/openstack/models/network/router_tests.rb b/tests/openstack/models/network/router_tests.rb
index faad48a..9390fe8 100644
--- a/tests/openstack/models/network/router_tests.rb
+++ b/tests/openstack/models/network/router_tests.rb
@@ -5,7 +5,7 @@ Shindo.tests("Fog::Network[:openstack] | router", ['openstack']) do
     tests('#create').succeeds do
       @instance = Fog::Network[:openstack].routers.create(
         :name => 'router_name',
-        :admin_state_up => true,
+        :admin_state_up => true
       )
       !@instance.id.nil?
     end
diff --git a/tests/openstack/models/network/routers_tests.rb b/tests/openstack/models/network/routers_tests.rb
index 9aca47d..f21014a 100644
--- a/tests/openstack/models/network/routers_tests.rb
+++ b/tests/openstack/models/network/routers_tests.rb
@@ -1,7 +1,7 @@
 Shindo.tests("Fog::Network[:openstack] | routers", ['openstack']) do
   @router = Fog::Network[:openstack].routers.create(
     :name => 'router_name',
-    :admin_state_up => true,
+    :admin_state_up => true
   )
   @routers = Fog::Network[:openstack].routers