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

samples/tests/samples/standalone/sample_extension_test.dart

Index: samples/tests/samples/standalone/sample_extension_test.dart
diff --git a/samples/tests/samples/standalone/sample_extension_test.dart b/samples/tests/samples/standalone/sample_extension_test.dart
deleted file mode 100644
index 8b98e40db4444a85462a6d3e0265ddc082550a44..0000000000000000000000000000000000000000
--- a/samples/tests/samples/standalone/sample_extension_test.dart
+++ /dev/null
@@ -1,73 +0,0 @@
-// 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.
-//
-// Dart test program for testing native extensions.
-
-import 'dart:async';
-import 'dart:io';
-import 'dart:isolate';
-
-import "package:expect/expect.dart";
-import "package:path/path.dart";
-
-Future copyFileToDirectory(String file, String directory) {
-  String src = file;
-  String dst = directory;
-  switch (Platform.operatingSystem) {
-    case 'linux':
-    case 'macos':
-      return Process.run('cp', [src, dst]);
-    case 'windows':
-      return Process.run('cmd.exe', ['/C', 'copy $src $dst']);
-    default:
-      Expect.fail('Unknown operating system ${Platform.operatingSystem}');
-  }
-}
-
-String getNativeLibraryPath(String buildDirectory) {
-  switch (Platform.operatingSystem) {
-    case 'linux':
-      return join(buildDirectory, 'lib.target', 'libsample_extension.so');
-    case 'macos':
-      return join(buildDirectory, 'libsample_extension.dylib');
-    case 'windows':
-      return join(buildDirectory, 'sample_extension.dll');
-    default:
-      Expect.fail('Unknown operating system ${Platform.operatingSystem}');
-  }
-}
-
-void main() {
-  String scriptDirectory = dirname(Platform.script);
-  String buildDirectory = dirname(Platform.executable);
-  Directory tempDirectory = new Directory('').createTempSync();
-  String testDirectory = tempDirectory.path;
-  String sourceDirectory =
-      join(scriptDirectory, '..', '..', '..', 'sample_extension');
-
-  // Copy sample_extension shared library, sample_extension dart files and
-  // sample_extension tests to the temporary test directory.
-  copyFileToDirectory(getNativeLibraryPath(buildDirectory), testDirectory)
-  .then((_) => Future.forEach(['sample_synchronous_extension.dart',
-                               'sample_asynchronous_extension.dart',
-                               'test_sample_synchronous_extension.dart',
-                               'test_sample_asynchronous_extension.dart'],
-    (file) => copyFileToDirectory(join(sourceDirectory, file), testDirectory)
-  ))
-
-  .then((_) => Future.forEach(['test_sample_synchronous_extension.dart',
-                               'test_sample_asynchronous_extension.dart'],
-    (test) => Process.run(Platform.executable, [join(testDirectory, test)])
-    .then((ProcessResult result) {
-      if (result.exitCode != 0) {
-        print('Failing test: ${join(sourceDirectory, test)}');
-        print('Failing process stdout: ${result.stdout}');
-        print('Failing process stderr: ${result.stderr}');
-        print('End failing process stderr');
-        Expect.fail('Test failed with exit code ${result.exitCode}');
-      }
-    })
-  ))
-  .whenComplete(() => tempDirectory.deleteSync(recursive: true));
-}