pkg/matcher: refactor with unittest v0.12 work

test/iterable_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.
 
 library matcher.iterable_matchers_test;
 
 import 'package:matcher/matcher.dart';
 import 'package:unittest/unittest.dart' show test, group;
 
 import 'test_utils.dart';
 
 void main() {
-  initUtils();
-
   test('isEmpty', () {
     shouldPass([], isEmpty);
     shouldFail([1], isEmpty, "Expected: empty Actual: [1]");
   });
 
   test('isNotEmpty', () {
     shouldFail([], isNotEmpty, "Expected: non-empty Actual: []");
     shouldPass([1], isNotEmpty);
   });
 
@@ skipping 132 matching lines @@
         "Expected: pairwise less than [1, 4, 9] "
         "Actual: [1, 2, 3] "
         "Which: has <1> which is not less than <1> at index 0");
     shouldPass(d, pairwiseCompare(e, (e, a) => a * a == e, "square root of"));
     shouldFail(d, pairwiseCompare(e, (e, a) => a + a == e, "double"),
         "Expected: pairwise double [1, 4, 9] "
         "Actual: [1, 2, 3] "
         "Which: has <1> which is not double <1> at index 0");
   });
 }