diff --git a/tests/test_header.py b/tests/test_header.py
index cd26c8f..ade8f79 100644
--- a/tests/test_header.py
+++ b/tests/test_header.py
@@ -1,10 +1,10 @@
 import url2markdown.header as header
 
 
-def test_build_header_dict(create_article):
+def test_undefined_topics(create_article):
     article = create_article()
-    header._build_header_dict(article)
-    assert False
+    result = header._build_header_dict(article)
+    assert result['topics'][0] == 'to_categorise'
 
 
 def test_get_topics_from_cli():