diff --git a/tests/test_filecrawl.py b/tests/test_filecrawl.py
index 317b558..1e3b768 100644
--- a/tests/test_filecrawl.py
+++ b/tests/test_filecrawl.py
@@ -1,10 +1,10 @@
 import unittest
 from unittest.mock import MagicMock, patch
 
-from cellxgene_gateway.filecrawl import render_item
+from cellxgene_gateway.filecrawl import render_item, render_item_source
 from cellxgene_gateway.items.file.fileitem import FileItem
 from cellxgene_gateway.items.file.fileitem_source import FileItemSource
-from cellxgene_gateway.items.item import ItemType
+from cellxgene_gateway.items.item import ItemTree, ItemType
 
 source = FileItemSource("/tmp")
 
@@ -29,3 +29,15 @@ class TestRenderEntry(unittest.TestCase):
         entry = FileItem(subpath="somepath", name="entry", type=ItemType.h5ad)
         rendered = render_item(entry, source)
         self.assertIn("view/somepath/entry/'", rendered)
+
+
+class TestRenderItemSource(unittest.TestCase):
+    @patch("cellxgene_gateway.items.file.fileitem_source.FileItemSource")
+    def test_GIVEN_some_filter_THEN_includes_filterpart_in_heading(self, item_source):
+        item_source.name = "FakeSource"
+        item_source.list_items.return_value = ItemTree("rootdir", [], [])
+        rendered = render_item_source(item_source, "some_filter")
+        self.assertEqual(
+            rendered,
+            "<h6><a href='/filecrawl.html?source=FakeSource'>FakeSource</a>:some_filter</h6><li><a href='/filecrawl/rootdir?source=FakeSource'>rootdir</a><ul></ul></li>",
+        )