pkg/csslib: use pkg/test and allow latest version of logging pkg

test/error_test.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.
 
 library error_test;
 
-import 'package:unittest/unittest.dart';
+import 'package:csslib/src/messages.dart';
+import 'package:test/test.dart';
+
 import 'testing.dart';
-import 'package:csslib/src/messages.dart';
 
 /**
  * Test for unsupported font-weights values of bolder, lighter and inherit.
  */
 void testUnsupportedFontWeights() {
   var errors = [];
 
   // TODO(terry): Need to support bolder.
   // font-weight value bolder.
   var input = ".foobar { font-weight: bolder; }";
@@ skipping 324 matching lines @@
 }
 
 main() {
   test('font-weight value errors', testUnsupportedFontWeights);
   test('line-height value errors', testUnsupportedLineHeights);
   test('bad selectors', testBadSelectors);
   test('bad Hex values', testBadHexValues);
   test('bad unicode ranges', testBadUnicode);
   test('nested rules', testBadNesting);
 }