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

samples/swarm/test/swarm_ui_lib/observable/observable_test.dart

Index: samples/swarm/test/swarm_ui_lib/observable/observable_test.dart
diff --git a/samples/tests/samples/lib/observable/observable_test.dart b/samples/swarm/test/swarm_ui_lib/observable/observable_test.dart
similarity index 89%
rename from samples/tests/samples/lib/observable/observable_test.dart
rename to samples/swarm/test/swarm_ui_lib/observable/observable_test.dart
index 4826800349cbc4cc056c072dd1898b15a764ea53..f310f7f63ccfbcc9c55ad808c5fb3fb8b5734b47 100644
--- a/samples/tests/samples/lib/observable/observable_test.dart
+++ b/samples/swarm/test/swarm_ui_lib/observable/observable_test.dart
@@ -5,9 +5,9 @@
 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';
+import '../../../swarm_ui_lib/observable/observable.dart';
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
 
 part 'abstract_observable_tests.dart';
 part 'change_event_tests.dart';