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

samples/tests/samples/lib/observable/abstract_observable_tests.dart

Index: samples/tests/samples/lib/observable/abstract_observable_tests.dart
diff --git a/samples/tests/samples/lib/observable/abstract_observable_tests.dart b/samples/tests/samples/lib/observable/abstract_observable_tests.dart
deleted file mode 100644
index 5a9908684feba625ea6113ecbe666d9a8914e8b1..0000000000000000000000000000000000000000
--- a/samples/tests/samples/lib/observable/abstract_observable_tests.dart
+++ /dev/null
@@ -1,75 +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.
-
-part of observable_tests;
-
-testAbstractObservable() {
-  group('addChangeListener()', () {
-    test('adding the same listener twice returns false the second time', () {
-      final target = new AbstractObservable();
-      final listener = (e) { };
-
-      expect(target.addChangeListener(listener), isTrue);
-      expect(target.addChangeListener(listener), isFalse);
-    });
-
-    test('modifies listeners list', () {
-      // check that add/remove works, see contents of listeners too
-      final target = new AbstractObservable();
-      final l1 = (e) { };
-      final l2 = (e) { };
-      final l3 = (e) { };
-      final l4 = (e) { };
-
-      expect(target.listeners, orderedEquals([]));
-
-      target.addChangeListener(l1);
-      expect(target.listeners, orderedEquals([l1]));
-
-      target.addChangeListener(l2);
-      expect(target.listeners, orderedEquals([l1, l2]));
-
-      target.addChangeListener(l3);
-      target.addChangeListener(l4);
-      expect(target.listeners, orderedEquals([l1, l2, l3, l4]));
-
-      target.removeChangeListener(l4);
-      expect(target.listeners, orderedEquals([l1, l2, l3]));
-
-      target.removeChangeListener(l2);
-      expect(target.listeners, orderedEquals([l1, l3]));
-
-      target.removeChangeListener(l1);
-      expect(target.listeners, orderedEquals([l3]));
-
-      target.removeChangeListener(l3);
-      expect(target.listeners, orderedEquals([]));
-    });
-  });
-
-  test('fires immediately if no batch', () {
-    // If no batch is created, a summary should be automatically created and
-    // fired on each property change.
-    final target = new AbstractObservable();
-    EventSummary res = null;
-    target.addChangeListener((summary) {
-      expect(res, isNull);
-      res = summary;
-      expect(res, isNotNull);
-    });
-
-    target.recordPropertyUpdate('pM', 10, 11);
-
-    expect(res, isNotNull);
-    expect(res.events, hasLength(1));
-    validateUpdate(res.events[0], target, 'pM', null, 10, 11);
-    res = null;
-
-    target.recordPropertyUpdate('pL', '11', '13');
-
-    expect(res, isNotNull);
-    expect(res.events, hasLength(1));
-    validateUpdate(res.events[0], target, 'pL', null, '11', '13');
-  });
-}