Run outer tearDown()s even if inner ones fail.

test/backend/declarer_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.
 
 import 'dart:async';
 
 import 'package:test/src/backend/declarer.dart';
 import 'package:test/src/backend/invoker.dart';
 import 'package:test/src/backend/suite.dart';
 import 'package:test/src/frontend/timeout.dart';
@@ skipping 371 matching lines @@
             expect(outerTearDownRun, isFalse);
             expect(innerTearDownRun, isFalse);
           }, max: 1));
         });
 
         await _runTest(0);
         expect(innerTearDownRun, isTrue);
         expect(outerTearDownRun, isTrue);
       });
 
+      test("runs outer callbacks even when inner ones fail", () async {
+        var outerTearDownRun = false;
+        _declarer.tearDown(() {
+          return new Future(() => outerTearDownRun = true);
+        });
+
+        _declarer.group("inner", () {
+          _declarer.tearDown(() {
+            throw 'inner error';
+          });
+
+          _declarer.test("description", expectAsync(() {
+            expect(outerTearDownRun, isFalse);
+          }, max: 1));
+        });
+
+        await _runTest(0, shouldFail: true);
+        expect(outerTearDownRun, isTrue);
+      });
+
       test("can't be called multiple times", () {
         _declarer.group("group", () {
           _declarer.tearDown(() {});
           expect(() => _declarer.tearDown(() {}), throwsStateError);
         });
       });
     });
   });
 }
 
 /// Runs the test at [index] defined on [_declarer].
 ///
 /// This automatically sets up an `onError` listener to ensure that the test
 /// doesn't throw any invisible exceptions.
 Future _runTest(int index, {bool shouldFail: false}) {
   var liveTest = _declarer.tests[index].load(_suite);
 
   liveTest.onError.listen(shouldFail
       ? expectAsync((_) {})
       : expectAsync((_) {},
             count: 0, reason: "No errors expected for test #$index."));
 
   return liveTest.run();
 }