diff --git a/ckan/tests/logic/test_action.py b/ckan/tests/logic/test_action.py
index 75357a0bfc8..6d392087410 100644
--- a/ckan/tests/logic/test_action.py
+++ b/ckan/tests/logic/test_action.py
@@ -1132,6 +1132,40 @@ def test_42_resource_search_accessible_via_get_request(self):
             assert "index" in resource['description'].lower()
             assert "json" in resource['format'].lower()
 
+    def test_package_create_duplicate_extras_error(self):
+        import ckan.tests
+        import paste.fixture
+        import pylons.test
+
+        # Posting a dataset dict to package_create containing two extras dicts
+        # with the same key, should return a Validation Error.
+        app = paste.fixture.TestApp(pylons.test.pylonsapp)
+        error = ckan.tests.call_action_api(app, 'package_create',
+                apikey=self.sysadmin_user.apikey, status=409,
+                name='foobar', extras=[{'key': 'foo', 'value': 'bar'},
+                    {'key': 'foo', 'value': 'gar'}])
+        assert error['__type'] == 'Validation Error'
+        assert error['extras_validation'] == 'Duplicate key "foo"'
+
+    def test_package_update_duplicate_extras_error(self):
+        import ckan.tests
+        import paste.fixture
+        import pylons.test
+
+        # We need to create a package first, so that we can update it.
+        app = paste.fixture.TestApp(pylons.test.pylonsapp)
+        package = ckan.tests.call_action_api(app, 'package_create',
+                apikey=self.sysadmin_user.apikey, name='foobar')
+
+        # Posting a dataset dict to package_update containing two extras dicts
+        # with the same key, should return a Validation Error.
+        package['extras'] = [{'key': 'foo', 'value': 'bar'},
+                    {'key': 'foo', 'value': 'gar'}]
+        error = ckan.tests.call_action_api(app, 'package_update',
+                apikey=self.sysadmin_user.apikey, status=409, **package)
+        assert error['__type'] == 'Validation Error'
+        assert error['extras_validation'] == 'Duplicate key "foo"'
+
 class TestActionTermTranslation(WsgiAppCase):
 
     @classmethod
@@ -1470,5 +1504,3 @@ def test_before_view(self):
 
         res = self.app.get('/dataset?q=')
         assert res.body.count('string_not_found_in_rest_of_template') == 2
-
-