pkg/matcher: upgrate tests to test

test/operator_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.operator_matchers_test;
 
 import 'package:matcher/matcher.dart';
-import 'package:unittest/unittest.dart'
+import 'package:test/test.dart'
     show test, group, expect, throwsArgumentError;
 
 import 'test_utils.dart';
 
 void main() {
   test('anyOf', () {
     // with a list
     shouldFail(
         0, anyOf([equals(1), equals(2)]), "Expected: (<1> or <2>) Actual: <0>");
     shouldPass(1, anyOf([equals(1), equals(2)]));
@@ skipping 30 matching lines @@
         "Actual: <4> "
         "Which: is not a value less than <4>");
   });
 
   test('If the first argument is a List, the rest must be null', () {
     expect(() => allOf([], 5), throwsArgumentError);
     expect(
         () => anyOf([], null, null, null, null, null, 42), throwsArgumentError);
   });
 }