Reload native extensions when starting from a snapshot.

samples/sample_extension/test/sample_extension_script_snapshot_test.dart

Index: samples/sample_extension/test/sample_extension_script_snapshot_test.dart
diff --git a/samples/sample_extension/test/sample_extension_test.dart b/samples/sample_extension/test/sample_extension_script_snapshot_test.dart
similarity index 50%
copy from samples/sample_extension/test/sample_extension_test.dart
copy to samples/sample_extension/test/sample_extension_script_snapshot_test.dart
index 9c0a42d30468c79d2a4caafba5165a0ad5df1a88..08ba5bbe78af5e02d93969a1b4135b9594dcad22 100644
--- a/samples/sample_extension/test/sample_extension_test.dart
+++ b/samples/sample_extension/test/sample_extension_script_snapshot_test.dart
@@ -38,27 +38,32 @@ String getNativeLibraryPath(String buildDirectory) {
   }
 }
 
-void main() {
+void main() async {
   String buildDirectory = dirname(Platform.executable);
   Directory tempDirectory =
       Directory.systemTemp.createTempSync('sample_extension_');
-  String testDirectory = tempDirectory.path;
-  String sourceDirectory = Platform.script.resolve('..').toFilePath();
+  try {
+    String testDirectory = tempDirectory.path;
+    String sourceDirectory = Platform.script.resolve('..').toFilePath();
 
-  // 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)
-  ))
+    // Copy sample_extension shared library, sample_extension dart files and
+    // sample_extension tests to the temporary test directory.
+    await copyFileToDirectory(getNativeLibraryPath(buildDirectory),
+                              testDirectory);
+    for (var file in ['sample_synchronous_extension.dart',
+                      'sample_asynchronous_extension.dart',
+                      'test_sample_synchronous_extension.dart',
+                      'test_sample_asynchronous_extension.dart']) {
+      await 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) {
+    for (var test in ['test_sample_synchronous_extension.dart',
+                      'test_sample_asynchronous_extension.dart']) {
+      String script = join(testDirectory, test);
+      String snapshot = join(testDirectory, "$test.snapshot");
+      ProcessResult result = await Process.run(Platform.executable,

[Cutch, 2016/11/03 17:45:34]

the only difference between this file and the previous one is that arguments
passed to Process.run ?

Can this be refactored?

+                                               ['--snapshot=$snapshot',
+                                                script]);
       if (result.exitCode != 0) {
         print('Failing test: ${join(sourceDirectory, test)}');
         print('Failing process stdout: ${result.stdout}');
@@ -66,7 +71,18 @@ void main() {
         print('End failing process stderr');
         Expect.fail('Test failed with exit code ${result.exitCode}');
       }
-    })
-  ))
-  .whenComplete(() => tempDirectory.deleteSync(recursive: true));
+
+      result = await Process.run(Platform.executable,
+                                 [snapshot]);
+      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}');
+      }
+    }
+  } finally {
+    await tempDirectory.deleteSync(recursive: true);
+  }
 }