Add support for setUpAll and tearDownAll.

test/utils.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.
 
 library test.test.utils;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:test/src/backend/declarer.dart';
 import 'package:test/src/backend/group.dart';
 import 'package:test/src/backend/group_entry.dart';
 import 'package:test/src/backend/invoker.dart';
 import 'package:test/src/backend/live_test.dart';
 import 'package:test/src/backend/metadata.dart';
 import 'package:test/src/backend/state.dart';
 import 'package:test/src/backend/suite.dart';
 import 'package:test/src/runner/application_exception.dart';
+import 'package:test/src/runner/engine.dart';
 import 'package:test/src/runner/load_exception.dart';
+import 'package:test/src/runner/runner_suite.dart';
+import 'package:test/src/runner/vm/environment.dart';
 import 'package:test/src/util/remote_exception.dart';
 import 'package:test/test.dart';
 
 /// The string representation of an untyped closure with no arguments.
 ///
 /// This differs between dart2js and the VM.
 final String closureString = (() {}).toString();
 
 // The last state change detected via [expectStates].
 State lastState;
@@ skipping 247 matching lines @@
     });
   });
 
   await liveTest.run();
   expectTestPassed(liveTest);
   // Ensure that the outer test doesn't complete until the inner future
   // completes.
   return future;
 }
 
+/// Runs [body] with a declarer, runs all the declared tests, and asserts that
+/// they pass.
+Future expectTestsPass(void body()) async {
+  var engine = declareEngine(body);
+  var success = await engine.run();
+
+  for (var test in engine.liveTests) {
+    expectTestPassed(test);
+  }
+
+  expect(success, isTrue);
+}
+
 /// Runs [body] with a declarer and returns the declared entries.
 List<GroupEntry> declare(void body()) {
   var declarer = new Declarer()..declare(body);
   return declarer.build().entries;
 }
+
+/// Runs [body] with a declarer and returns an engine that runs those tests.
+Engine declareEngine(void body()) {
+  var declarer = new Declarer()..declare(body);
+  return new Engine.withSuites([
+    new RunnerSuite(const VMEnvironment(), declarer.build())
+  ]);
+}