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

samples/tests/samples/lib/observable/observable_test.dart

Index: samples/tests/samples/lib/observable/observable_test.dart
diff --git a/samples/tests/samples/lib/observable/observable_test.dart b/samples/tests/samples/lib/observable/observable_test.dart
deleted file mode 100644
index 4826800349cbc4cc056c072dd1898b15a764ea53..0000000000000000000000000000000000000000
--- a/samples/tests/samples/lib/observable/observable_test.dart
+++ /dev/null
@@ -1,50 +0,0 @@
-// 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 observable_tests;
-
-import 'dart:html';
-import '../../../../swarm/swarm_ui_lib/observable/observable.dart';
-import '../../../../../pkg/unittest/lib/unittest.dart';
-import '../../../../../pkg/unittest/lib/html_config.dart';
-
-part 'abstract_observable_tests.dart';
-part 'change_event_tests.dart';
-part 'event_batch_tests.dart';
-part 'observable_list_tests.dart';
-part 'observable_value_tests.dart';
-
-void main() {
-  useHtmlConfiguration();
-  group('AbstractObservable', testAbstractObservable);
-  group('ChangeEvent', testChangeEvent);
-  group('EventBatch', testEventBatch);
-  group('ObservableList', testObservableList);
-  group('ObservableValue', testObservableValue);
-}
-
-void validateEvent(ChangeEvent e, target, pName, index, type, newVal, oldVal) {
-  expect(e.target, equals(target));
-  expect(e.propertyName, equals(pName));
-  expect(e.index, equals(index));
-  expect(e.type, equals(type));
-  expect(e.newValue, equals(newVal));
-  expect(e.oldValue, equals(oldVal));
-}
-
-void validateGlobal(ChangeEvent e, target) {
-  validateEvent(e, target, null, null, ChangeEvent.GLOBAL, null, null);
-}
-
-void validateInsert(ChangeEvent e, target, pName, index, newVal) {
-  validateEvent(e, target, pName, index, ChangeEvent.INSERT, newVal, null);
-}
-
-void validateRemove(ChangeEvent e, target, pName, index, oldVal) {
-  validateEvent(e, target, pName, index, ChangeEvent.REMOVE, null, oldVal);
-}
-
-void validateUpdate(ChangeEvent e, target, pName, index, newVal, oldVal) {
-  validateEvent(e, target, pName, index, ChangeEvent.UPDATE, newVal, oldVal);
-}