using unittest via package import

tests/html/webgl_1_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 web_gl_test;
-import '../../pkg/unittest/lib/unittest.dart';
-import '../../pkg/unittest/lib/html_individual_config.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_individual_config.dart';
 import 'dart:html';
 import 'dart:typed_data';
 import 'dart:web_gl';
 import 'dart:web_gl' as gl;
 
 // Test that WebGL is present in dart:web_gl API
 
 main() {
   useHtmlIndividualConfiguration();
 
@@ skipping 84 matching lines @@
         expect(attributes.depth, isBoolean);
         expect(attributes.premultipliedAlpha, isBoolean);
         expect(attributes.preserveDrawingBuffer, isBoolean);
         expect(attributes.stencil, isBoolean);
       });
     }
   });
 }
 
 Matcher isBoolean = anyOf(isTrue, isFalse);