pkg/matcher: refactor with unittest v0.12 work

test/numeric_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.numeric_matchers_test;
 
 import 'package:matcher/matcher.dart';
 import 'package:unittest/unittest.dart' show test, group;
 
 import 'test_utils.dart';
 
 void main() {
-  initUtils();
-
   test('greaterThan', () {
     shouldPass(10, greaterThan(9));
     shouldFail(9, greaterThan(10), "Expected: a value greater than <10> "
         "Actual: <9> "
         "Which: is not a value greater than <10>");
   });
 
   test('greaterThanOrEqualTo', () {
     shouldPass(10, greaterThanOrEqualTo(10));
     shouldFail(9, greaterThanOrEqualTo(10),
@@ skipping 109 matching lines @@
   });
 
   test('inClosedOpenRange', () {
     shouldPass(0, inClosedOpenRange(0, 2));
     shouldPass(1, inClosedOpenRange(0, 2));
     shouldFail(2, inClosedOpenRange(0, 2),
         "Expected: be in range from 0 (inclusive) to 2 (exclusive) "
         "Actual: <2>");
   });
 }