pkg/(unit)test: Enable group names containing spaces in HtmlIndividualConfiguration

lib/html_individual_config.dart

 // Copyright (c) 2013, 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.
 
 /// A unit test library for running groups of tests in a browser, instead of the
 /// entire test file. This is especially used for large tests files that have
 /// many subtests, so we can mark groups as failing at a finer granularity than
 /// the entire test file.
 ///
 /// To use, import this file, and call [useHtmlIndividualConfiguration] at the
 /// start of your set sequence. Important constraint: your group descriptions
 /// MUST NOT contain spaces.
 library unittest.html_individual_config;
 
 import 'dart:html';
 import 'unittest.dart' as unittest;
 import 'html_config.dart' as htmlconfig;
 
 class HtmlIndividualConfiguration extends htmlconfig.HtmlConfiguration {
   HtmlIndividualConfiguration(bool isLayoutTest) : super(isLayoutTest);
 
   void onStart() {
-    var search = window.location.search;
-    if (search != '') {
-      var groups = search
-          .substring(1)
-          .split('&')
-          .where((p) => p.startsWith('group='))
-          .toList();
+    var uri = Uri.parse(window.location.href);
 
-      if (!groups.isEmpty) {
-        if (groups.length > 1) {
-          throw new ArgumentError('More than one "group" parameter provided.');
-        }
+    var groups = 'group='.allMatches(uri.query).toList();
 
-        var testGroupName = groups.single.split('=')[1];
-        var startsWith = "$testGroupName${unittest.groupSep}";
-        unittest.filterTests(
-            (unittest.TestCase tc) => tc.description.startsWith(startsWith));
-      }
+    if (groups.length > 1) {
+      throw new ArgumentError('More than one "group" parameter provided.');
+    }
+
+    var testGroupName = uri.queryParameters['group'];
+
+    if (testGroupName != null) {
+      var startsWith = "$testGroupName${unittest.groupSep}";
+      unittest.filterTests(
+          (unittest.TestCase tc) => tc.description.startsWith(startsWith));
     }
     super.onStart();
   }
 }
 
 void useHtmlIndividualConfiguration([bool isLayoutTest = false]) {
   unittest.unittestConfiguration =
       isLayoutTest ? _singletonLayout : _singletonNotLayout;
 }
 
 final _singletonLayout = new HtmlIndividualConfiguration(true);
 final _singletonNotLayout = new HtmlIndividualConfiguration(false);