Bug 1648493 - tests r=necko-reviewers,kershaw

Differential Revision: https://phabricator.services.mozilla.com/D88299

dom/url/tests/test_url.html

@@ -487,5 +487,15 @@
     is(u.toJSON(), "http://www.example.org/", "URL.toJSON()");
     is(JSON.stringify(u), "\"http://www.example.org/\"", "JSON.stringify(u) works");
   </script>
+
+  <script>
+    // bug 1648493
+    var url = new URL("http://example.com/");
+    url.protocol = 'file'
+    url.protocol = 'resource'
+    url.password = 'ê'
+    url.username = 'ç'
+    url.protocol = 't'
+  </script>
 </body>
 </html>

netwerk/test/unit/test_standardurl.js

@@ -1271,3 +1271,29 @@ add_task(async function test_emptyHostWithURLType() {
     "A pseudo-empty host is not allowed for URLTYPE_AUTHORITY"
   );
 });
+
+add_task(async function test_bug1648493() {
+  let url = stringToURL("https://example.com/");
+  url = url
+    .mutate()
+    .setScheme("file")
+    .finalize();
+  url = url
+    .mutate()
+    .setScheme("resource")
+    .finalize();
+  url = url
+    .mutate()
+    .setPassword("ê")
+    .finalize();
+  url = url
+    .mutate()
+    .setUsername("ç")
+    .finalize();
+  url = url
+    .mutate()
+    .setScheme("t")
+    .finalize();
+  equal(url.spec, "t://%C3%83%C2%A7:%C3%83%C2%AA@example.com/");
+  equal(url.username, "%C3%83%C2%A7");
+});