URL: test U+FFFF in URLSearchParams

For https://bugs.chromium.org/p/chromium/issues/detail?id=633153.
diff --git a/url/urlencoded-parser.any.js b/url/urlencoded-parser.any.js
index 46b932b..847465c 100644
--- a/url/urlencoded-parser.any.js
+++ b/url/urlencoded-parser.any.js
@@ -2,6 +2,7 @@
   { "input": "test", "output": [["test", ""]] },
   { "input": "\uFEFFtest=\uFEFF", "output": [["\uFEFFtest", "\uFEFF"]] },
   { "input": "%EF%BB%BFtest=%EF%BB%BF", "output": [["\uFEFFtest", "\uFEFF"]] },
+  { "input": "%EF%BF%BF=%EF%BF%BF", "output": [["\uFFFF", "\uFFFF"]] },
   { "input": "%FE%FF", "output": [["\uFFFD\uFFFD", ""]] },
   { "input": "%FF%FE", "output": [["\uFFFD\uFFFD", ""]] },
   { "input": "†&†=x", "output": [["†", ""], ["†", "x"]] },