pkg/unittest: deprecate expectAsyncN and expectAsyncUntilN

pkg/unittest/test/test_utils.dart

Index: pkg/unittest/test/test_utils.dart
diff --git a/pkg/unittest/test/test_utils.dart b/pkg/unittest/test/test_utils.dart
index 01a483be73349176b1a1844346b26b4e5016e418..de783bedcf09abf5b13449ad96ef732a592f9b73 100644
--- a/pkg/unittest/test/test_utils.dart
+++ b/pkg/unittest/test/test_utils.dart
@@ -41,7 +41,7 @@ void shouldFail(value, Matcher matcher, expected, {bool isAsync: false}) {
   }
 
   if (isAsync) {
-    Timer.run(expectAsync0(afterTest));
+    Timer.run(expectAsync(afterTest));
   } else {
     afterTest();
   }
@@ -57,7 +57,7 @@ void shouldPass(value, Matcher matcher, {bool isAsync: false}) {
     expect(errorCount, equals(0));
   }
   if (isAsync) {
-    Timer.run(expectAsync0(afterTest));
+    Timer.run(expectAsync(afterTest));
   } else {
     afterTest();
   }