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runtime/observatory/tests/service/pause_on_start_and_exit_test.dart

 // Copyright (c) 2015, 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.
 // VMOptions=--error_on_bad_type --error_on_bad_override
 
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 import 'dart:async';
 
 void testMain() {
   print('Hello');
 }
 
 var tests = [
+  (Isolate isolate) async {
+    print('Getting stream...');
+    Completer completer = new Completer();
+    var stream = await isolate.vm.getEventStream(VM.kDebugStream);
+    print('Subscribing...');
+    var subscription;
+    subscription = stream.listen((ServiceEvent event) {
+      if (event.kind == ServiceEvent.kPauseStart) {
+        print('Received $event');
+        subscription.cancel();
+        completer.complete();
+      } else {
+        print('Ignoring event $event');
+      }
+    });
+    print('Subscribed.  Pause event is ${isolate.pauseEvent}');
 
-(Isolate isolate) async {
-  print('Getting stream...');
-  Completer completer = new Completer();
-  var stream = await isolate.vm.getEventStream(VM.kDebugStream);
-  print('Subscribing...');
-  var subscription;
-  subscription = stream.listen((ServiceEvent event) {
-    if (event.kind == ServiceEvent.kPauseStart) {
-      print('Received $event');
+    if (isolate.pauseEvent != null && isolate.pauseEvent is M.PauseStartEvent) {
+      // Wait for the isolate to hit PauseStart.
       subscription.cancel();
-      completer.complete();
+      print('Subscription cancelled.');
     } else {
-      print('Ignoring event $event');
+      print('Waiting for pause start event.');
+      await completer.future;
     }
-  });
-  print('Subscribed.  Pause event is ${isolate.pauseEvent}');
+    print('Done waiting for pause event.');
 
-  if (isolate.pauseEvent != null &&
-      isolate.pauseEvent is M.PauseStartEvent) {
-    // Wait for the isolate to hit PauseStart.
-    subscription.cancel();
-    print('Subscription cancelled.');
-  } else {
-    print('Waiting for pause start event.');
+    // Grab the timestamp.
+    var pausetime1 = isolate.pauseEvent.timestamp;
+    expect(pausetime1, isNotNull);
+    // Reload the isolate.
+    await isolate.reload();
+    // Verify that it is the same.
+    expect(pausetime1.millisecondsSinceEpoch,
+        equals(isolate.pauseEvent.timestamp.millisecondsSinceEpoch));
+
+    completer = new Completer();
+    stream = await isolate.vm.getEventStream(VM.kDebugStream);
+    subscription = stream.listen((ServiceEvent event) {
+      if (event.kind == ServiceEvent.kPauseExit) {
+        print('Received PauseExit');
+        subscription.cancel();
+        completer.complete();
+      }
+    });
+
+    print('Resuming...');
+    isolate.resume();
+
+    // Wait for the isolate to hit PauseExit.
     await completer.future;
-  }
-  print('Done waiting for pause event.');
 
-  // Grab the timestamp.
-  var pausetime1 = isolate.pauseEvent.timestamp;
-  expect(pausetime1, isNotNull);
-  // Reload the isolate.
-  await isolate.reload();
-  // Verify that it is the same.
-  expect(pausetime1.millisecondsSinceEpoch,
-         equals(isolate.pauseEvent.timestamp.millisecondsSinceEpoch));
-
-  completer = new Completer();
-  stream = await isolate.vm.getEventStream(VM.kDebugStream);
-  subscription = stream.listen((ServiceEvent event) {
-    if (event.kind == ServiceEvent.kPauseExit) {
-      print('Received PauseExit');
-      subscription.cancel();
-      completer.complete();
-    }
-  });
-
-  print('Resuming...');
-  isolate.resume();
-
-  // Wait for the isolate to hit PauseExit.
-  await completer.future;
-
-  // Grab the timestamp.
-  var pausetime2 = isolate.pauseEvent.timestamp;
-  expect(pausetime2, isNotNull);
-  // Reload the isolate.
-  await isolate.reload();
-  // Verify that it is the same.
-  expect(pausetime2.millisecondsSinceEpoch,
-         equals(isolate.pauseEvent.timestamp.millisecondsSinceEpoch));
-  expect(pausetime2.millisecondsSinceEpoch,
-         greaterThan(pausetime1.millisecondsSinceEpoch));
-},
-
+    // Grab the timestamp.
+    var pausetime2 = isolate.pauseEvent.timestamp;
+    expect(pausetime2, isNotNull);
+    // Reload the isolate.
+    await isolate.reload();
+    // Verify that it is the same.
+    expect(pausetime2.millisecondsSinceEpoch,
+        equals(isolate.pauseEvent.timestamp.millisecondsSinceEpoch));
+    expect(pausetime2.millisecondsSinceEpoch,
+        greaterThan(pausetime1.millisecondsSinceEpoch));
+  },
 ];
 
 main(args) => runIsolateTests(args, tests,
-                              testeeConcurrent: testMain,
-                              pause_on_start: true,
-                              pause_on_exit: true,
-                              verbose_vm: true,
-                              extraArgs: [ '--trace-service',
-                                           '--trace-service-verbose' ]);
+    testeeConcurrent: testMain,
+    pause_on_start: true,
+    pause_on_exit: true,
+    verbose_vm: true,
+    extraArgs: ['--trace-service', '--trace-service-verbose']);