diff --git a/ckan/new_tests/logic/action/test_update.py b/ckan/new_tests/logic/action/test_update.py
index 3a8bfc70c7f..d05607e25d2 100644
--- a/ckan/new_tests/logic/action/test_update.py
+++ b/ckan/new_tests/logic/action/test_update.py
@@ -636,7 +636,7 @@ def setup(self):
     def teardown_class(cls):
         helpers.reset_db()
 
-    def test_url(self):
+    def test_url_only(self):
         dataset = factories.Dataset()
         resource = factories.Resource(package=dataset, url='http://first')
 
@@ -649,16 +649,77 @@ def test_url(self):
                                        id=resource['id'])
         assert_equals(resource['url'], 'http://second')
 
-    def test_extra(self):
+    def test_extra_only(self):
         dataset = factories.Dataset()
         resource = factories.Resource(package=dataset, newfield='first')
 
         res_returned = helpers.call_action('resource_update',
                                            id=resource['id'],
                                            url=resource['url'],
-                                           newfield='http://second')
+                                           newfield='second')
 
         assert_equals(res_returned['newfield'], 'second')
         resource = helpers.call_action('resource_show',
                                        id=resource['id'])
         assert_equals(resource['newfield'], 'second')
+
+    def test_both_extra_and_url(self):
+        dataset = factories.Dataset()
+        resource = factories.Resource(package=dataset,
+                                      url='http://first',
+                                      newfield='first')
+
+        res_returned = helpers.call_action('resource_update',
+                                           id=resource['id'],
+                                           url='http://second',
+                                           newfield='second')
+
+        assert_equals(res_returned['url'], 'http://second')
+        assert_equals(res_returned['newfield'], 'second')
+
+        resource = helpers.call_action('resource_show',
+                                       id=resource['id'])
+        assert_equals(res_returned['url'], 'http://second')
+        assert_equals(resource['newfield'], 'second')
+
+    def test_extra_gets_deleted_on_both_core_and_extra_update(self):
+        dataset = factories.Dataset()
+        resource = factories.Resource(package=dataset,
+                                      url='http://first',
+                                      newfield='first')
+
+        res_returned = helpers.call_action('resource_update',
+                                           id=resource['id'],
+                                           url='http://second',
+                                           anotherfield='second')
+
+        assert_equals(res_returned['url'], 'http://second')
+        assert_equals(res_returned['anotherfield'], 'second')
+        assert 'newfield' not in res_returned
+
+        resource = helpers.call_action('resource_show',
+                                       id=resource['id'])
+        assert_equals(res_returned['url'], 'http://second')
+        assert_equals(res_returned['anotherfield'], 'second')
+        assert 'newfield' not in res_returned
+
+    def test_extra_gets_deleted_on_extra_only_update(self):
+        dataset = factories.Dataset()
+        resource = factories.Resource(package=dataset,
+                                      url='http://first',
+                                      newfield='first')
+
+        res_returned = helpers.call_action('resource_update',
+                                           id=resource['id'],
+                                           url='http://first',
+                                           anotherfield='second')
+
+        assert_equals(res_returned['url'], 'http://first')
+        assert_equals(res_returned['anotherfield'], 'second')
+        assert 'newfield' not in res_returned
+
+        resource = helpers.call_action('resource_show',
+                                       id=resource['id'])
+        assert_equals(res_returned['url'], 'http://first')
+        assert_equals(res_returned['anotherfield'], 'second')
+        assert 'newfield' not in res_returned