TESTS: Add URL normalisation xfail test

Author: hukkin

tests/test_port/fixtures/normalize.md

@@ -29,3 +29,11 @@ Don't encode domains in unknown schemas:
 .
 <p><a href="skype:%CE%B3%CE%B3%CE%B3"></a></p>
 .
+
+
+Square brackets are allowed
+.
+[foo](https://bar]baz.org)
+.
+<p><a href="https://bar%5Dbaz.org">foo</a></p>
+.

tests/test_port/test_fixtures.py

@@ -81,7 +81,10 @@ def test_commonmark_extras(line, title, input, expected):
     read_fixture_file(FIXTURE_PATH.joinpath("normalize.md")),
 )
 def test_normalize_url(line, title, input, expected):
-    if "Keep %25" in title:
+    if title in {
+        "Keep %25 as is because decoding it may break urls, #720",
+        "Square brackets are allowed",
+    }:
         # TODO fix failing url escaping test
         pytest.xfail("url normalisation")
     md = MarkdownIt("commonmark")