URI encoder/decoder - copied from other repo.

tests/utils/uri_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.
 
 #library('uriTest');
 
+#import('../../lib/utf/utf.dart');
 #import('../../lib/uri/uri.dart');
 
 testUri(String uri, bool isAbsolute) {
   Expect.equals(isAbsolute, new Uri.fromString(uri).isAbsolute());
   Expect.stringEquals(uri, new Uri.fromString(uri).toString());
 }
 
+testEncodeDecode(String orig, String encoded) {
+  var e = encodeUri(orig);
+  Expect.stringEquals(encoded, e);
+  var d = decodeUri(encoded);
+  Expect.stringEquals(orig, d);
+}
+
+testEncodeDecodeComponent(String orig, String encoded) {
+  var e = encodeUriComponent(orig);
+  Expect.stringEquals(encoded, e);
+  var d = decodeUriComponent(encoded);
+  Expect.stringEquals(orig, d);
+}
+
 main() {
   testUri("http:", true);
   testUri("file://", true);
   testUri("file", false);
   testUri("http://user@example.com:80/fisk?query=89&hest=silas", true);
   testUri("http://user@example.com:80/fisk?query=89&hest=silas#fragment",
           false);
   Expect.stringEquals("http://user@example.com:80/a/b/c?query#fragment",
                       const Uri("http", "user", "example.com", 80, "/a/b/c",
                                 "query", "fragment").toString());
@@ skipping 59 matching lines @@
                       base.resolve("g?y/../x").toString());
   Expect.stringEquals("http://a/b/c/g#s/./x",
                       base.resolve("g#s/./x").toString());
   Expect.stringEquals("http://a/b/c/g#s/../x",
                       base.resolve("g#s/../x").toString());
   Expect.stringEquals("http:g", base.resolve("http:g").toString());
 
   // Additional tests (not from RFC 3986).
   Expect.stringEquals("http://a/b/g;p/h;s",
                       base.resolve("../g;p/h;s").toString());
+
+  // URI encode tests
+  // Note: dart2js won't handle '\ud800\udc00' and frog
+  // won't handle '\u{10000}'. So we cons this up synthetically...
+  var s = decodeUtf8([0xf0, 0x90, 0x80, 0x80]);
+  
+  testEncodeDecode("\uFFFE", "%EF%BF%BE");
+  testEncodeDecode("\uFFFF", "%EF%BF%BF");
+  testEncodeDecode("\uFFFE", "%EF%BF%BE");
+  testEncodeDecode("\uFFFF", "%EF%BF%BF");
+  testEncodeDecode("\x7f", "%7F");
+  testEncodeDecode("\x80", "%C2%80");
+  testEncodeDecode("\u0800", "%E0%A0%80");
+  testEncodeDecode(":/@',;?&=+\$", ":/@',;?&=+\$");
+  testEncodeDecode(s, "%F0%90%80%80");
+  testEncodeDecodeComponent("\uFFFE", "%EF%BF%BE");
+  testEncodeDecodeComponent("\uFFFF", "%EF%BF%BF");
+  testEncodeDecodeComponent("\uFFFE", "%EF%BF%BE");
+  testEncodeDecodeComponent("\uFFFF", "%EF%BF%BF");
+  testEncodeDecodeComponent("\x7f", "%7F");
+  testEncodeDecodeComponent("\x80", "%C2%80");
+  testEncodeDecodeComponent("\u0800", "%E0%A0%80");
+  testEncodeDecodeComponent(":/@',;?&=+\$", "%3A%2F%40'%2C%3B%3F%26%3D%2B%24");
+  testEncodeDecodeComponent(s, "%F0%90%80%80");
 }