Abort unit tests in the event of async failure while awaiting a future.

pkg/unittest/test/async_exception_with_future_test.dart

+// Copyright (c) 2014, 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 unittestTest;
+
+import 'dart:async';
+import 'dart:isolate';
+
+import 'package:unittest/unittest.dart';
+
+part 'utils.dart';
+
+var testName = 'async exception with future test';
+
+var testFunction = (TestConfiguration testConfig) {
+  tearDown(() { testConfig.teardown = 'teardown'; });
+  test(testName, () {
+    // The "throw" statement below should terminate the test immediately.
+    // The framework should not wait for the future to complete.
+    // tearDown should still execute.
+    _defer(() { throw "error!"; });
+    return new Completer().future;
+  });
+};
+
+final expected = buildStatusString(0, 1, 0, testName,
+    message: 'Caught error!', teardown: 'teardown');