Add another URI resolve test

tests/corelib/uri_http_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
 
 testHttpUri() {
   void check(Uri uri, String expected) {
     Expect.equals(expected, uri.toString());
   }
@@ skipping 48 matching lines @@
   check(new Uri.https("host", "/a b/"), "https://host/a%20b/");
   check(new Uri.https("host", "/a%2F"), "https://host/a%252F");
   check(new Uri.https("host", "/a%2F/"), "https://host/a%252F/");
   check(new Uri.https("host", "/a/b", { "c": "d" }), "https://host/a/b?c=d");
   check(new Uri.https("host",
                       "/a/b", { "c=": "&d" }), "https://host/a/b?c%3D=%26d");
   check(new Uri.https("[::]", "a"), "https://[::]/a");
   check(new Uri.https("[::127.0.0.1]", "a"), "https://[::127.0.0.1]/a");
 }
 
+testResolveHttpScheme() {
+  String s = "//myserver:1234/path/some/thing";
+  Uri uri = Uri.parse(s);
+  Uri http = new Uri(scheme: "http");
+  Uri https = new Uri(scheme: "https");
+  Expect.equals("http:$s", http.resolveUri(uri).toString());
+  Expect.equals("https:$s", https.resolveUri(uri).toString());
+}
+
 main() {
   testHttpUri();
   testHttpsUri();
+  testResolveHttpScheme();
 }