Add an [unorderedMatches] matcher to unittest.

pkg/unittest/test/matchers_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 'dart:async';
 import 'dart:collection';
 
 import 'package:unittest/unittest.dart';
 
 import 'test_utils.dart';
@@ skipping 466 matching lines @@
       shouldFail(d, unorderedEquals([3, 2, 1]),
           "Expected: equals [3, 2, 1] unordered "
           "Actual: [1, 2] "
           "Which: has too few elements (2 < 3)");
       shouldFail(d, unorderedEquals([3, 1]),
           "Expected: equals [3, 1] unordered "
           "Actual: [1, 2] "
           "Which: has no match for element <3> at index 0");
     });
 
+    test('unorderedMatchess', () {
+      var d = [1, 2];
+      shouldPass(d, unorderedMatches([2, 1]));
+      shouldPass(d, unorderedMatches([greaterThan(1), greaterThan(0)]));
+      shouldFail(d, unorderedMatches([greaterThan(0)]),
+          "Expected: matches [a value greater than <0>] unordered "
+          "Actual: [1, 2] "
+          "Which: has too many elements (2 > 1)");
+      shouldFail(d, unorderedMatches([3, 2, 1]),
+          "Expected: matches [<3>, <2>, <1>] unordered "
+          "Actual: [1, 2] "
+          "Which: has too few elements (2 < 3)");
+      shouldFail(d, unorderedMatches([3, 1]),
+          "Expected: matches [<3>, <1>] unordered "
+          "Actual: [1, 2] "
+          "Which: has no match for <3> at index 0");
+      shouldFail(d, unorderedMatches([greaterThan(3), greaterThan(0)]),
+          "Expected: matches [a value greater than <3>, a value greater than "
+              "<0>] unordered "
+          "Actual: [1, 2] "
+          "Which: has no match for a value greater than <3> at index 0");
+    });
+
     test('pairwise compare', () {
       var c = [1, 2];
       var d = [1, 2, 3];
       var e = [1, 4, 9];
       shouldFail('x', pairwiseCompare(e, (e,a) => a <= e,
           "less than or equal"),
           "Expected: pairwise less than or equal [1, 4, 9] "
           "Actual: 'x' "
           "Which: is not an Iterable");
       shouldFail(c, pairwiseCompare(e, (e,a) => a <= e, "less than or equal"),
@@ skipping 259 matching lines @@
 
   X() {
     print(foo);
   }
 }
 
 abstract class Abstraction {
   void norealization();
 }