setUp/tearDown functions can now be asynchronous.

pkg/unittest/test/unittest_test.dart

 // Copyright (c) 2012, 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.
 
 // TODO(gram):
 // Unfortunately I can't seem to test anything that involves timeouts, e.g.
 // insufficient callbacks, because the timeout is controlled externally
 // (test.dart?), and we would need to use a shorter timeout for the inner tests
 // so the outer timeout doesn't fire. So I removed all such tests.
 // I'd like to revisit this at some point.
 
 library unittestTest;
 import 'dart:isolate';
+import 'dart:async';
 import 'package:unittest/unittest.dart';
 
 var tests; // array of test names
 var expected; // array of test expected results (from buildStatusString)
 var actual; // actual test results (from buildStatusString in config.onDone)
 var _testconfig; // test configuration to capture onDone
 
 _defer(void fn()) {
   // Exploit isolate ports as a platform-independent mechanism to queue a
   // message at the end of the event loop. Stolen from unittest.dart.
@@ skipping 123 matching lines @@
     } else if (testName == 'middle exception test') {
       test('testOne', () { expect(true, isTrue); });
       test('testTwo', () { expect(true, isFalse); });
       test('testThree', () {
         var done = expectAsync0((){});
         _defer(() {
           expect(true, isTrue);
           done();
         });
       });
+    } else if (testName == 'async setup/teardown test') {
+      group('good setup/good teardown', () {
+        setUp(() { 
+          var completer = new Completer();
+          _defer(() {
+            completer.complete(0);
+          });
+          return completer.future;
+        });
+        tearDown(() {
+          var completer = new Completer();
+          _defer(() {
+            completer.complete(0);
+          });
+          return completer.future;
+        });
+        test('foo1', (){});
+      });
+      group('good setup/bad teardown', () {
+        setUp(() { 
+          var completer = new Completer();
+          _defer(() {
+            completer.complete(0);
+          });
+          return completer.future;
+        });
+        tearDown(() {
+          var completer = new Completer();
+          _defer(() {
+            //throw "Failed to complete tearDown";
+            completer.completeError(
+                new AsyncError("Failed to complete tearDown"));
+          });
+          return completer.future;
+        });
+        test('foo2', (){});
+      });
+      group('bad setup/good teardown', () {
+        setUp(() { 
+          var completer = new Completer();
+          _defer(() {
+            //throw "Failed to complete setUp";
+            completer.completeError(new AsyncError("Failed to complete setUp"));
+          });
+          return completer.future;
+        });
+        tearDown(() {
+          var completer = new Completer();
+          _defer(() {
+            completer.complete(0);
+          });
+          return completer.future;
+        });
+        test('foo3', (){});
+      });
+      group('bad setup/bad teardown', () {
+        setUp(() { 
+          var completer = new Completer();
+          _defer(() {
+            //throw "Failed to complete setUp";
+            completer.completeError(new AsyncError("Failed to complete setUp"));
+          });
+          return completer.future;
+        });
+        tearDown(() {
+          var completer = new Completer();
+          _defer(() {
+            //throw "Failed to complete tearDown";
+            completer.completeError(
+                new AsyncError("Failed to complete tearDown"));
+          });
+          return completer.future;
+        });
+        test('foo4', (){});
+      });
+      // The next test is just to make sure we make steady progress 
+      // through the tests.
+      test('post groups', () {});
     }
   });
 }
 
 void nextTest(int testNum) {
   SendPort sport = spawnFunction(runTest);
   sport.call(tests[testNum]).then((msg) {
     actual.add(msg);
     if (actual.length == expected.length) {
       for (var i = 0; i < tests.length; i++) {
@@ skipping 12 matching lines @@
     'exception test',
     'group name test',
     'setup test',
     'teardown test',
     'setup and teardown test',
     'correct callback test',
     'excess callback test',
     'completion test',
     'async exception test',
     'late exception test',
-    'middle exception test'
+    'middle exception test',
+    'async setup/teardown test'
   ];
 
   expected = [
     buildStatusString(1, 0, 0, tests[0]),
     buildStatusString(0, 1, 0, tests[1],
         message: 'Expected: <5> but: was <4>.'),
     buildStatusString(0, 1, 0, tests[2], message: 'Caught Exception: Fail.'),
     buildStatusString(2, 0, 0, 'a a::a b b'),
     buildStatusString(1, 0, 0, 'a ${tests[4]}', count: 0, setup: 'setup'),
     buildStatusString(1, 0, 0, 'a ${tests[5]}', count: 0, setup: '',
         teardown: 'teardown'),
     buildStatusString(1, 0, 0, 'a ${tests[6]}', count: 0,
         setup: 'setup', teardown: 'teardown'),
     buildStatusString(1, 0, 0, tests[7], count: 1),
     buildStatusString(0, 0, 1, tests[8], count: 1,
         message: 'Callback called more times than expected (2 > 1).'),
     buildStatusString(1, 0, 0, tests[9], count: 10),
     buildStatusString(0, 1, 0, tests[10], message: 'Caught error!'),
-    buildStatusString(1, 0, 1, 'testOne', message: 'Callback called after already being marked as done (1).:testTwo:'),
-    buildStatusString(2, 1, 0, 'testOne::testTwo:Expected: false but: was <true>.:testThree')
+    buildStatusString(1, 0, 1, 'testOne',
+        message: 'Callback called after already being marked as done '
+                 '(1).:testTwo:'),
+    buildStatusString(2, 1, 0,
+        'testOne::testTwo:Expected: false but: was <true>.:testThree'),
+    buildStatusString(2, 0, 3, 
+        'good setup/good teardown foo1::'
+        'good setup/bad teardown foo2:good setup/bad teardown '
+        'foo2: Test teardown failed: Failed to complete tearDown:'
+        'bad setup/good teardown foo3:bad setup/good teardown '
+        'foo3: Test setup failed: Failed to complete setUp:'
+        'bad setup/bad teardown foo4:bad setup/bad teardown '
+        'foo4: Test teardown failed: Failed to complete tearDown:'
+        'post groups')
   ];
 
   actual = [];
 
   nextTest(0);
 }