Add Uri.isScheme test function.

tests/corelib/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 "package:expect/expect.dart";
 import 'dart:convert';
 
 testUri(String uriText, bool isAbsolute) {
@@ skipping 15 matching lines @@
 
   // Test that removeFragment doesn't change anything else.
   if (uri.hasFragment) {
     Expect.equals(Uri.parse(uriText.substring(0, uriText.indexOf('#'))),
                   uri.removeFragment());
   } else {
     Expect.equals(uri,
                   Uri.parse(uriText + "#fragment").removeFragment());
   }
 
-  // Test uri.replace on uri with fragment
-  uri = Uri.parse('http://hello.com/fake#fragment');
-  uri = uri.replace(path: "D/E/E");
-  Expect.stringEquals('http://hello.com/D/E/E#fragment', uri.toString());
+  Expect.isTrue(uri.isScheme(uri.scheme));
+  Expect.isTrue(uri.isScheme(uri.scheme.toLowerCase()));
+  Expect.isTrue(uri.isScheme(uri.scheme.toUpperCase()));
+  if (uri.hasScheme) {
+    // Capitalize
+    Expect.isTrue(uri.isScheme(
+        uri.scheme[0].toUpperCase()+uri.scheme.substring(1)));
+    Expect.isFalse(uri.isScheme(
+        uri.scheme.substring(0, uri.scheme.length - 1)));
+    Expect.isFalse(uri.isScheme(uri.scheme + ":"));
+    Expect.isFalse(uri.isScheme(uri.scheme + "\x00"));
+  } else {
+    Expect.isTrue(uri.isScheme(null));
+    Expect.isFalse(uri.isScheme(":"));
+  }
 }
 
 testEncodeDecode(String orig, String encoded) {
   var e = Uri.encodeFull(orig);
   Expect.stringEquals(encoded, e);
   var d = Uri.decodeFull(encoded);
   Expect.stringEquals(orig, d);
 }
 
 testEncodeDecodeComponent(String orig, String encoded) {
@@ skipping 696 matching lines @@
   Expect.equals(2, params.length);
   Expect.listEquals(["42", "37"], params["x"]);
   Expect.listEquals(["43", "38"], params["y"]);
 
   // Test replacing with empty strings.
   uri = Uri.parse("s://a:1/b/c?d#e");
   Expect.equals("s://a:1/b/c?d#", uri.replace(fragment: "").toString());
   Expect.equals("s://a:1/b/c?#e", uri.replace(query: "").toString());
   Expect.equals("s://a:1?d#e", uri.replace(path: "").toString());
   Expect.equals("s://:1/b/c?d#e", uri.replace(host: "").toString());
+
+  // Test uri.replace on uri with fragment
+  uri = Uri.parse('http://hello.com/fake#fragment');
+  uri = uri.replace(path: "D/E/E");
+  Expect.stringEquals('http://hello.com/D/E/E#fragment', uri.toString());
 }
 
 void testRegression28359() {
   var uri = new Uri(path: "//");
   // This is an invalid path for a URI reference with no authority
   // since it looks like an authority.
   // Normalized to have an authority.
   Expect.equals("////", "$uri");
   Expect.equals("//", uri.path);
   Expect.isTrue(uri.hasAuthority, "$uri has authority");
@@ skipping 180 matching lines @@
 String dump(Uri uri) {
   return "URI: $uri\n"
       "  Scheme:    ${uri.scheme} #${uri.scheme.length}\n"
       "  User-info: ${uri.userInfo} #${uri.userInfo.length}\n"
       "  Host:      ${uri.host} #${uri.host.length}\n"
       "  Port:      ${uri.port}\n"
       "  Path:      ${uri.path} #${uri.path.length}\n"
       "  Query:     ${uri.query} #${uri.query.length}\n"
       "  Fragment:  ${uri.fragment} #${uri.fragment.length}\n";
 }