Upgrading tests with unittest deprecations

tests/lib/async/stream_single_test.dart

Index: tests/lib/async/stream_single_test.dart
diff --git a/tests/lib/async/stream_single_test.dart b/tests/lib/async/stream_single_test.dart
index 4c3c486d76c0dc79c9963b5ff58c517dc491b029..f40d942a7d4321cd7a6eb4e87c8037d65b6c8b9f 100644
--- a/tests/lib/async/stream_single_test.dart
+++ b/tests/lib/async/stream_single_test.dart
@@ -15,21 +15,21 @@ main() {
   test("single", () {
     StreamController c = new StreamController(sync: true);
     Future f = c.stream.single;
-    f.then(expectAsync1((v) { Expect.equals(42, v);}));
+    f.then(expectAsync((v) { Expect.equals(42, v);}));
     new Events.fromIterable([42]).replay(c);
   });
 
   test("single empty", () {
     StreamController c = new StreamController(sync: true);
     Future f = c.stream.single;
-    f.catchError(expectAsync1((error) { Expect.isTrue(error is StateError); }));
+    f.catchError(expectAsync((error) { Expect.isTrue(error is StateError); }));
     new Events.fromIterable([]).replay(c);
   });
 
   test("single error", () {
     StreamController c = new StreamController(sync: true);
     Future f = c.stream.single;
-    f.catchError(expectAsync1((error) { Expect.equals("error", error); }));
+    f.catchError(expectAsync((error) { Expect.equals("error", error); }));
     Events errorEvents = new Events()..error("error")..close();
     errorEvents.replay(c);
   });
@@ -37,7 +37,7 @@ main() {
   test("single error 2", () {
     StreamController c = new StreamController(sync: true);
     Future f = c.stream.single;
-    f.catchError(expectAsync1((error) { Expect.equals("error", error); }));
+    f.catchError(expectAsync((error) { Expect.equals("error", error); }));
     Events errorEvents = new Events()..error("error")..error("error2")..close();
     errorEvents.replay(c);
   });
@@ -45,7 +45,7 @@ main() {
   test("single error 3", () {
     StreamController c = new StreamController(sync: true);
     Future f = c.stream.single;
-    f.catchError(expectAsync1((error) { Expect.equals("error", error); }));
+    f.catchError(expectAsync((error) { Expect.equals("error", error); }));
     Events errorEvents = new Events()..add(499)..error("error")..close();
     errorEvents.replay(c);
   });