Reorganize tests for samples so the test is discoverable from the sample

samples/swarm/test/swarm_ui_lib/touch/touch_test.dart

 // Copyright (c) 2011, 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 touchTests;
 
 import 'dart:html'; // TODO(rnystrom): Only needed to tell architecture.py
-                      // that this is a web test. Come up with cleaner solution.
-import '../../../../../pkg/unittest/lib/unittest.dart';
-import '../../../../../pkg/unittest/lib/html_config.dart';
-import '../../../../swarm/swarm_ui_lib/touch/touch.dart';
+                    // that this is a web test. Come up with cleaner solution.
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
+import '../../../swarm_ui_lib/touch/touch.dart';
 
 main() {
   useHtmlConfiguration();
   test('Solver', () {
     expect(Solver.solve((x) => x * x, 81, 10), closeTo(9, 0.1));
     expect(Solver.solve((x) => x * x, 0, 10), closeTo(0, 0.1));
     expect(Solver.solve((x) => x * x, 1.5625, 10), closeTo(1.25, 0.1));
     expect(Solver.solve((x) => 1 / x, 10, 1), closeTo(0.1, 0.1));
   });
 
@@ skipping 21 matching lines @@
      onDecelerateCallback(x, y, duration, timingFunction);
   }
 
   /**
    * Callback for end of deceleration.
    */
   void onDecelerationEnd() {
     onDecelerationEndCallback();
   }
 }