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runtime/observatory/tests/service/steal_breakpoint_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 --steal-breakpoints
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 import 'dart:async';
 
 int counter = 0;
 
 void periodicTask(_) {
-  counter++;  // Line 14.  We set our breakpoint here.
+  counter++; // Line 14.  We set our breakpoint here.
   if (counter % 1000 == 0) {
     print('counter = $counter');
   }
 }
 
 void startTimer() {
-  new Timer.periodic(const Duration(milliseconds:10), periodicTask);
+  new Timer.periodic(const Duration(milliseconds: 10), periodicTask);
 }
 
 var tests = [
+// Add a breakpoint and wait for it to be reached.
+  (Isolate isolate) async {
+    await isolate.rootLibrary.load();
 
-// Add a breakpoint and wait for it to be reached.
-(Isolate isolate) async {
-  await isolate.rootLibrary.load();
+    // Set up a listener to wait for breakpoint events.
+    Completer completer = new Completer();
+    var stream = await isolate.vm.getEventStream(VM.kDebugStream);
+    var subscription;
+    subscription = stream.listen((ServiceEvent event) {
+      if (event.kind == ServiceEvent.kPauseBreakpoint) {
+        print('Isolate paused at breakpoint');
+        subscription.cancel();
+        completer.complete();
+      }
+    });
 
-  // Set up a listener to wait for breakpoint events.
-  Completer completer = new Completer();
-  var stream = await isolate.vm.getEventStream(VM.kDebugStream);
-  var subscription;
-  subscription = stream.listen((ServiceEvent event) {
-    if (event.kind == ServiceEvent.kPauseBreakpoint) {
-      print('Isolate paused at breakpoint');
-      subscription.cancel();
-      completer.complete();
-    }
-  });
+    // Add the breakpoint.
+    var script = isolate.rootLibrary.scripts[0];
+    var result = await isolate.addBreakpoint(script, 14);
+    expect(result is Breakpoint, isTrue);
 
-  // Add the breakpoint.
-  var script = isolate.rootLibrary.scripts[0];
-  var result = await isolate.addBreakpoint(script, 14);
-  expect(result is Breakpoint, isTrue);
-
-  await completer.future;  // Wait for breakpoint event to fire.
-},
+    await completer.future; // Wait for breakpoint event to fire.
+  },
 
 // We are at the breakpoint on line 14.
-(Isolate isolate) async {
-  ServiceMap stack = await isolate.getStack();
-  expect(stack.type, equals('Stack'));
-  expect(stack['frames'].length, greaterThanOrEqualTo(1));
+  (Isolate isolate) async {
+    ServiceMap stack = await isolate.getStack();
+    expect(stack.type, equals('Stack'));
+    expect(stack['frames'].length, greaterThanOrEqualTo(1));
 
-  Script script = stack['frames'][0].location.script;
-  await script.load();
-  expect(script.name,endsWith('steal_breakpoint_test.dart'));
-  expect(script.tokenToLine(stack['frames'][0].location.tokenPos), equals(14));
-},
+    Script script = stack['frames'][0].location.script;
+    await script.load();
+    expect(script.name, endsWith('steal_breakpoint_test.dart'));
+    expect(
+        script.tokenToLine(stack['frames'][0].location.tokenPos), equals(14));
+  },
 
 // Resume
-(Isolate isolate) async {
-  Completer completer = new Completer();
-  var stream = await isolate.vm.getEventStream(VM.kDebugStream);
-  var subscription;
-  subscription = stream.listen((ServiceEvent event) {
-    if (event.kind == ServiceEvent.kResume) {
-      print('Isolate resumed');
-      subscription.cancel();
-      completer.complete();
-    }
-  });
-  isolate.resume();
-  await completer.future;
-},
-
+  (Isolate isolate) async {
+    Completer completer = new Completer();
+    var stream = await isolate.vm.getEventStream(VM.kDebugStream);
+    var subscription;
+    subscription = stream.listen((ServiceEvent event) {
+      if (event.kind == ServiceEvent.kResume) {
+        print('Isolate resumed');
+        subscription.cancel();
+        completer.complete();
+      }
+    });
+    isolate.resume();
+    await completer.future;
+  },
 ];
 
 main(args) => runIsolateTests(args, tests, testeeBefore: startTimer);