[PR #11651/398329f6 backport][3.13] add xfail test for issue 11632 (#11658)

**This is a backport of PR #11651 as merged into master
(398329f).**

Co-authored-by: Alexander Mohr <thehesiod@users.noreply.github.com>

Author: patchback[bot]

tests/test_cookie_helpers.py

@@ -1137,6 +1137,33 @@ def test_parse_cookie_header_empty() -> None:
     assert parse_cookie_header("   ") == []
 
 
+@pytest.mark.xfail(reason="https://github.com/aio-libs/aiohttp/issues/11632")
+def test_parse_cookie_gstate_header() -> None:
+    header = (
+        "_ga=ga; "
+        "ajs_anonymous_id=0anonymous; "
+        "analytics_session_id=session; "
+        "cookies-analytics=true; "
+        "cookies-functional=true; "
+        "cookies-marketing=true; "
+        "cookies-preferences=true; "
+        'g_state={"i_l":0,"i_ll":12345,"i_b":"blah"}; '
+        "analytics_session_id.last_access=1760128947692; "
+        "landingPageURLRaw=landingPageURLRaw; "
+        "landingPageURL=landingPageURL; "
+        "referrerPageURLRaw=; "
+        "referrerPageURL=; "
+        "formURLRaw=formURLRaw; "
+        "formURL=formURL; "
+        "fbnAuthExpressCheckout=fbnAuthExpressCheckout; "
+        "is_express_checkout=1; "
+    )
+
+    result = parse_cookie_header(header)
+    assert result[7][0] == "g_state"
+    assert result[8][0] == "analytics_session_id.last_access"
+
+
 def test_parse_cookie_header_quoted_values() -> None:
     """Test parse_cookie_header handles quoted values correctly."""
     header = 'name="quoted value"; session="with;semicolon"; data="with\\"escaped\\""'