Add support for setUpAll and tearDownAll.

test/runner/signal_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.
 
 // Windows doesn't support sending signals.
 @TestOn("vm && !windows")
 
 import 'dart:async';
 import 'dart:io';
 
@@ skipping 64 matching lines @@
 
   group("during test running", () {
     test("waits for a VM test to finish running", () {
       d.file("test.dart", """
 import 'dart:async';
 import 'dart:io';
 
 import 'package:test/test.dart';
 
 void main() {
-  tearDown(() => new File("output").writeAsStringSync("ran teardown"));
+  tearDownAll(() {
+    new File("output_all").writeAsStringSync("ran tearDownAll");
+  });
+
+  tearDown(() => new File("output").writeAsStringSync("ran tearDown"));
 
   test("test", () {
     print("running test");
     return new Future.delayed(new Duration(seconds: 1));
   });
 }
 """).create();
 
       var test = _runTest(["test.dart"]);
       test.stdout.expect(consumeThrough("running test"));
       signalAndQuit(test);
 
-      d.file("output", "ran teardown").validate();
+      d.file("output", "ran tearDown").validate();
+      d.file("output_all", "ran tearDownAll").validate();
       expectTempDirEmpty();
     });
 
+    test("waits for an active tearDownAll to finish running", () {
+      d.file("test.dart", """
+import 'dart:async';
+import 'dart:io';
+
+import 'package:test/test.dart';
+
+void main() {
+  tearDownAll(() async {
+    print("running tearDownAll");
+    await new Future.delayed(new Duration(seconds: 1));
+    new File("output").writeAsStringSync("ran tearDownAll");
+  });
+
+  test("test", () {});
+}
+""").create();
+
+      var test = _runTest(["test.dart"]);
+      test.stdout.expect(consumeThrough("running tearDownAll"));
+      signalAndQuit(test);
+
+      d.file("output", "ran tearDownAll").validate();
+      expectTempDirEmpty();
+    });
+
     test("kills a browser test immediately", () {
       d.file("test.dart", """
 import 'dart:async';
 
 import 'package:test/test.dart';
 
 void main() {
   test("test", () {
     print("running test");
 
@@ skipping 114 matching lines @@
 
 void signalAndQuit(ScheduledProcess test) {
   test.signal(ProcessSignal.SIGTERM);
   test.shouldExit();
   test.stderr.expect(isDone);
 }
 
 void expectTempDirEmpty() {
   schedule(() => expect(new Directory(_tempDir).listSync(), isEmpty));
 }