Added origin property to Uri class Added unit test coverage for origin property

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) {
@@ skipping 100 matching lines @@
   Expect.stringEquals("a/b/e/", removeDotSegments("./a/b/./c/d/../../e/."));
   Expect.stringEquals("a/b/e/", removeDotSegments("./a/b/./c/d/../../e/./."));
   Expect.stringEquals("a/b/e/", removeDotSegments("./a/b/./c/d/../../e/././."));
 
   final urisSample = "http://a/b/c/d;p?q";
   Uri baseFromString = new Uri.fromString(urisSample);
   testUriPerRFCs(baseFromString);
   Uri base = new Uri(urisSample);
   testUriPerRFCs(base);
 
+  Expect.stringEquals(
+      "http://example.com",
+      new Uri.fromString("http://example.com/a/b/c").origin);
+  Expect.stringEquals(
+      "https://example.com",
+      new Uri.fromString("https://example.com/a/b/c").origin);
+  Expect.stringEquals(
+      "http://example.com:1234",
+      new Uri.fromString("http://example.com:1234/a/b/c").origin);
+  Expect.stringEquals(
+      "https://example.com:1234",
+      new Uri.fromString("https://example.com:1234/a/b/c").origin);
+  Expect.throws(
+      () => new Uri.fromString("http:").origin,
+      (e) { return e is IllegalArgumentException; },
+      "origin for uri with empty domain should fail");
+  Expect.throws(
+      () => const Uri.fromComponents("http", null, "", 80, "/a/b/c",
+                       "query", "fragment").origin,
+      (e) { return e is IllegalArgumentException; },
+      "origin for uri with empty domain should fail");
+  Expect.throws(
+      () => const Uri.fromComponents(null, null, "", 80, "/a/b/c",
+                       "query", "fragment").origin,
+      (e) { return e is IllegalArgumentException; },
+      "origin for uri with empty scheme should fail");
+  Expect.throws(
+      () => const Uri.fromComponents("http", null, null, 80, "/a/b/c",
+                       "query", "fragment").origin,
+      (e) { return e is IllegalArgumentException; },
+      "origin for uri with empty domain should fail");
+  Expect.throws(
+      () => new Uri.fromString("http://:80").origin,
+      (e) { return e is IllegalArgumentException; },
+      "origin for uri with empty domain should fail");
+  Expect.throws(
+      () => new Uri.fromString("file://localhost/test.txt").origin,
+      (e) { return e is IllegalArgumentException; },
+      "origin for non-http/https uri should fail");
+
   // 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");
 }