Replaced helper files that were accidentally removed during migration.

tests/lib_2/async/futures_test.dart

 // Copyright (c) 2011, 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.
 
 library futures_test;
 
 import 'package:async_helper/async_helper.dart';
 import "package:expect/expect.dart";
 import 'dart:async';
 
 Future testWaitEmpty() {
-  List<Future> futures = new List<Future>();
+  final futures = new List<Future>();
   return Future.wait(futures);
 }
 
 Future testCompleteAfterWait() {
-  List<Future> futures = new List<Future>();
-  Completer<Object> c = new Completer<Object>();
+  final futures = new List<Future>();
+  final c = new Completer<Object>();
   futures.add(c.future);
   Future future = Future.wait(futures);
   c.complete(null);
   return future;
 }
 
 Future testCompleteBeforeWait() {
-  List<Future> futures = new List<Future>();
-  Completer c = new Completer();
+  final futures = new List<Future>();
+  final c = new Completer();
   futures.add(c.future);
   c.complete(null);
   return Future.wait(futures);
 }
 
 Future testWaitWithMultipleValues() {
-  List<Future> futures = new List<Future>();
-  Completer c1 = new Completer();
-  Completer c2 = new Completer();
+  final futures = new List<Future>();
+  final c1 = new Completer();
+  final c2 = new Completer();
   futures.add(c1.future);
   futures.add(c2.future);
   c1.complete(1);
   c2.complete(2);
   return Future.wait(futures).then((values) {
     Expect.listEquals([1, 2], values);
   });
 }
 
 Future testWaitWithSingleError() {
-  List<Future> futures = new List<Future>();
-  Completer c1 = new Completer();
-  Completer c2 = new Completer();
+  final futures = new List<Future>();
+  final c1 = new Completer();
+  final c2 = new Completer();
   futures.add(c1.future);
   futures.add(c2.future);
   c1.complete();
   c2.completeError('correct error');
 
   return Future.wait(futures).then((_) {
     throw 'incorrect error';
   }).catchError((error, stackTrace) {
     Expect.equals('correct error', error);
     Expect.isNull(stackTrace);
   });
 }
 
 Future testWaitWithMultipleErrors() {
-  List<Future> futures = new List<Future>();
-  Completer c1 = new Completer();
-  Completer c2 = new Completer();
+  final futures = new List<Future>();
+  final c1 = new Completer();
+  final c2 = new Completer();
   futures.add(c1.future);
   futures.add(c2.future);
   c1.completeError('correct error');
   c2.completeError('incorrect error 1');
 
   return Future.wait(futures).then((_) {
     throw 'incorrect error 2';
   }).catchError((error, stackTrace) {
     Expect.equals('correct error', error);
     Expect.isNull(stackTrace);
   });
 }
 
 Future testWaitWithMultipleErrorsEager() {
-  List<Future> futures = new List<Future>();
-  Completer c1 = new Completer();
-  Completer c2 = new Completer();
+  final futures = new List<Future>();
+  final c1 = new Completer();
+  final c2 = new Completer();
   futures.add(c1.future);
   futures.add(c2.future);
   c1.completeError('correct error');
   c2.completeError('incorrect error 1');
 
   return Future.wait(futures, eagerError: true).then((_) {
     throw 'incorrect error 2';
   }).catchError((error, stackTrace) {
     Expect.equals('correct error', error);
     Expect.isNull(stackTrace);
   });
 }
 
 StackTrace get currentStackTrace {
   try {
     throw 0;
   } catch (e, st) {
     return st;
   }
   return null;
 }
 
 Future testWaitWithSingleErrorWithStackTrace() {
-  List<Future> futures = new List<Future>();
-  Completer c1 = new Completer();
-  Completer c2 = new Completer();
+  final futures = new List<Future>();
+  final c1 = new Completer();
+  final c2 = new Completer();
   futures.add(c1.future);
   futures.add(c2.future);
   c1.complete();
   c2.completeError('correct error', currentStackTrace);
 
   return Future.wait(futures).then((_) {
     throw 'incorrect error';
   }).catchError((error, stackTrace) {
     Expect.equals('correct error', error);
     Expect.isNotNull(stackTrace);
   });
 }
 
 Future testWaitWithMultipleErrorsWithStackTrace() {
-  List<Future> futures = new List<Future>();
-  Completer c1 = new Completer();
-  Completer c2 = new Completer();
+  final futures = new List<Future>();
+  final c1 = new Completer();
+  final c2 = new Completer();
   futures.add(c1.future);
   futures.add(c2.future);
   c1.completeError('correct error', currentStackTrace);
   c2.completeError('incorrect error 1');
 
   return Future.wait(futures).then((_) {
     throw 'incorrect error 2';
   }).catchError((error, stackTrace) {
     Expect.equals('correct error', error);
     Expect.isNotNull(stackTrace);
   });
 }
 
 Future testWaitWithMultipleErrorsWithStackTraceEager() {
-  List<Future> futures = new List<Future>();
-  Completer c1 = new Completer();
-  Completer c2 = new Completer();
+  final futures = new List<Future>();
+  final c1 = new Completer();
+  final c2 = new Completer();
   futures.add(c1.future);
   futures.add(c2.future);
   c1.completeError('correct error', currentStackTrace);
   c2.completeError('incorrect error 1');
 
   return Future.wait(futures, eagerError: true).then((_) {
     throw 'incorrect error 2';
   }).catchError((error, stackTrace) {
     Expect.equals('correct error', error);
     Expect.isNotNull(stackTrace);
   });
 }
 
 Future testEagerWait() {
   var st;
   try {
     throw 0;
   } catch (e, s) {
     st = s;
   }
-  Completer c1 = new Completer();
-  Completer c2 = new Completer();
-  List<Future> futures = <Future>[c1.future, c2.future];
-  Future waited = Future.wait(futures, eagerError: true);
-  var result = waited.then((v) {
+  final c1 = new Completer();
+  final c2 = new Completer();
+  final futures = <Future>[c1.future, c2.future];
+  final waited = Future.wait(futures, eagerError: true);
+  final result = waited.then((v) {
     throw "should not be called";
   }, onError: (e, s) {
     Expect.equals(e, 42);
     Expect.identical(st, s);
     return true;
   });
   c1.completeError(42, st);
   return result;
 }
 
 Future testForEachEmpty() {
   return Future.forEach([], (_) {
     throw 'should not be called';
   });
 }
 
 Future testForEach() {
-  var seen = <int>[];
+  final seen = <int>[];
   return Future.forEach([1, 2, 3, 4, 5], (n) {
     seen.add(n);
     return new Future.value();
   }).then((_) => Expect.listEquals([1, 2, 3, 4, 5], seen));
 }
 
 Future testForEachSync() {
-  var seen = <int>[];
+  final seen = <int>[];
   return Future.forEach([1, 2, 3, 4, 5], seen.add).then(
       (_) => Expect.listEquals([1, 2, 3, 4, 5], seen));
 }
 
 Future testForEachWithException() {
-  var seen = <int>[];
+  final seen = <int>[];
   return Future.forEach([1, 2, 3, 4, 5], (n) {
     if (n == 4) throw 'correct exception';
     seen.add(n);
     return new Future.value();
   }).then((_) {
     throw 'incorrect exception';
   }).catchError((error) {
     Expect.equals('correct exception', error);
   });
 }
@@ skipping 21 matching lines @@
     if (count == 4) throw 'correct exception';
     return new Future(() => true);
   }).then((_) {
     throw 'incorrect exception';
   }).catchError((error) {
     Expect.equals('correct exception', error);
   });
 }
 
 main() {
-  List<Future> futures = new List<Future>();
+  final futures = new List<Future>();
 
   futures.add(testWaitEmpty());
   futures.add(testCompleteAfterWait());
   futures.add(testCompleteBeforeWait());
   futures.add(testWaitWithMultipleValues());
   futures.add(testWaitWithSingleError());
   futures.add(testWaitWithMultipleErrors());
   futures.add(testWaitWithMultipleErrorsEager());
   futures.add(testWaitWithSingleErrorWithStackTrace());
   futures.add(testWaitWithMultipleErrorsWithStackTrace());
   futures.add(testWaitWithMultipleErrorsWithStackTraceEager());
   futures.add(testEagerWait());
   futures.add(testForEachEmpty());
   futures.add(testForEach());
   futures.add(testForEachSync());
   futures.add(testForEachWithException());
   futures.add(testDoWhile());
   futures.add(testDoWhileSync());
   futures.add(testDoWhileWithException());
 
   asyncStart();
   Future.wait(futures).then((List list) {
     Expect.equals(18, list.length);
     asyncEnd();
   });
 }