diff --git a/testing/web-platform/tests/urlpattern/resources/urlpatterntestdata.json b/testing/web-platform/tests/urlpattern/resources/urlpatterntestdata.json
index 671751fd3105b..8cb3fffa2bfe2 100644
--- a/testing/web-platform/tests/urlpattern/resources/urlpatterntestdata.json
+++ b/testing/web-platform/tests/urlpattern/resources/urlpatterntestdata.json
@@ -2665,5 +2665,19 @@
     "pattern": [{ "pathname": "*//*" }],
     "inputs": [{ "pathname": "foo/bar" }],
     "expected_match": null
+  },
+  {
+    "pattern": [{ "pathname": "/:foo." }],
+    "inputs": [{ "pathname": "/bar." }],
+    "expected_match": {
+      "pathname": { "input": "/bar.", "groups": { "foo": "bar" } }
+    }
+  },
+  {
+    "pattern": [{ "pathname": "/:foo.." }],
+    "inputs": [{ "pathname": "/bar.." }],
+    "expected_match": {
+      "pathname": { "input": "/bar..", "groups": { "foo": "bar" } }
+    }
   }
 ]