diff --git a/test/test_database.py b/test/test_database.py
index 2cd6375b16e5353c7c1d3eec1d3bdeb656454f8d..9446f85f3b3699a6e0e991b52911db33a085cfa2 100644
--- a/test/test_database.py
+++ b/test/test_database.py
@@ -180,6 +180,24 @@ class DatabaseTest(unittest.TestCase):
             self.assertRegex(actual[i]['code'], "[A-Z]{" + str(code_len) + "}")
             self.assertEqual(entry['type'], actual[i]['type'])
 
+    def test_update_codebook(self):
+        """Test that the codes get updated."""
+        # Get number of entries
+        stmt = 'SELECT COUNT(*) FROM CodeBook ORDER BY Word'
+        number_of_entries = self.database.conn.execute(stmt).fetchall()[0][0]
+        # Get old and updated word-code combinations
+        stmt = 'SELECT Word, Code FROM CodeBook'
+        old = self.database.conn.execute(stmt).fetchall()
+        self.database.update_codebook()
+        updated = self.database.conn.execute(stmt).fetchall()
+        # Collect approximately score of not updated pairs
+        pairs = 0
+        for i in range(0, number_of_entries, 2):
+            if old[i]['Code'] == updated[i]['Code']:
+                pairs = pairs + 1
+        # Test that at least some of the test are new
+        self.assertTrue(pairs < number_of_entries)
+
 
 if __name__ == '__main__':
     unittest.main()