diff --git a/test/test_Topic.py b/test/test_Topic.py
index 873ea9b07..46bd62e42 100644
--- a/test/test_Topic.py
+++ b/test/test_Topic.py
@@ -94,6 +94,10 @@ class TopicTestCase(ChannelPluginTestCase, PluginDocumentation):
         self.assertRegexp('topic reorder 2 1 3', r'bar.*foo.*baz')
         self.assertRegexp('topic reorder 3 -2 1', r'baz.*foo.*bar')
         self.assertError('topic reorder 0 1 2')
+        self.assertError('topic reorder 1 2')
+        self.assertError('topic reorder 2 3 4')
+        self.assertError('topic reorder 1 2 2')
+        self.assertError('topic reorder 1 1 2 3')
 
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