Remove package:unittest from some tests

tests/lib/async/stream_subscription_as_future_test.dart

 // Copyright (c) 2013, 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.
 
 // Test the Stream.single method.
 library stream_single_test;
 
-import "package:expect/expect.dart";
 import 'dart:async';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 main() {
   test("subscription.asFuture success", () {
     Stream stream = new Stream.fromIterable([1, 2, 3]);
     var output = [];
     var subscription = stream.listen((x) { output.add(x); });
     subscription.asFuture(output).then(expectAsync((o) {
-      Expect.listEquals([1, 2, 3], o);
+      expect([1, 2, 3], equals(o));
     }));
   });
 
   test("subscription.asFuture success2", () {
     StreamController controller = new StreamController(sync: true);
     [1, 2, 3].forEach(controller.add);
     controller.close();
     Stream stream = controller.stream;
     var output = [];
     var subscription = stream.listen((x) { output.add(x); });
     subscription.asFuture(output).then(expectAsync((o) {
-      Expect.listEquals([1, 2, 3], o);
+      expect([1, 2, 3], equals(o));
     }));
   });
 
   test("subscription.asFuture success 3", () {
     Stream stream = new Stream.fromIterable([1, 2, 3]).map((x) => x);
     var output = [];
     var subscription = stream.listen((x) { output.add(x); });
     subscription.asFuture(output).then(expectAsync((o) {
-      Expect.listEquals([1, 2, 3], o);
+      expect([1, 2, 3], equals(o));
     }));
   });
 
   test("subscription.asFuture different type", () {
     Stream stream = new Stream<int>.fromIterable([1, 2, 3]);
     var asyncCallback = expectAsync(() => {});
     var output = [];
     var subscription = stream.listen((x) { output.add(x); });
     subscription.asFuture("string").then((String o) {
-      Expect.listEquals([1, 2, 3], output);
-      Expect.equals("string", o);
+      expect([1, 2, 3], equals(output));
+      expect("string", equals(o));
       asyncCallback();
     });
   });
 
   test("subscription.asFuture failure", () {
     StreamController controller = new StreamController(sync: true);
     [1, 2, 3].forEach(controller.add);
     controller.addError("foo");
     controller.close();
     Stream stream = controller.stream;
     var output = [];
     var subscription = stream.listen((x) { output.add(x); });
     subscription.asFuture(output).catchError(expectAsync((error) {
-      Expect.equals(error, "foo");
+      expect(error, equals("foo"));
     }));
   });
 
   test("subscription.asFuture failure2", () {
     Stream stream = new Stream.fromIterable([1, 2, 3, 4])
       .map((x) {
         if (x == 4) throw "foo";
         return x;
       });
     var output = [];
     var subscription = stream.listen((x) { output.add(x); });
     subscription.asFuture(output).catchError(expectAsync((error) {
-      Expect.equals(error, "foo");
+      expect(error, equals("foo"));
     }));
   });
 
   test("subscription.asFuture delayed cancel", () {
     var completer = new Completer();
     var controller =
         new StreamController(onCancel: () => completer.future, sync: true);
     [1, 2, 3].forEach(controller.add);
     controller.addError("foo");
     controller.close();
     Stream stream = controller.stream;
     var output = [];
     var subscription = stream.listen((x) { output.add(x); });
     bool catchErrorHasRun = false;
     subscription.asFuture(output).catchError(expectAsync((error) {
-      Expect.equals(error, "foo");
+      expect(error, equals("foo"));
       catchErrorHasRun = true;
     }));
     Timer.run(expectAsync(() {
-      Expect.isFalse(catchErrorHasRun);
+      expect(catchErrorHasRun, isFalse);
       completer.complete();
     }));
   });
 
   test("subscription.asFuture failure in cancel", () {
     runZoned(() {
       var completer = new Completer();
       var controller =
           new StreamController(onCancel: () => completer.future, sync: true);
       [1, 2, 3].forEach(controller.add);
       controller.addError("foo");
       controller.close();
       Stream stream = controller.stream;
       var output = [];
       var subscription = stream.listen((x) { output.add(x); });
       bool catchErrorHasRun = false;
       subscription.asFuture(output).catchError(expectAsync((error) {
-        Expect.equals(error, "foo");
+        expect(error, equals("foo"));
         catchErrorHasRun = true;
       }));
       Timer.run(expectAsync(() {
-        Expect.isFalse(catchErrorHasRun);
+        expect(catchErrorHasRun, isFalse);
         completer.completeError(499);
       }));
     }, onError: expectAsync((e) {
-      Expect.equals(499, e);
+      expect(499, equals(e));
     }));
   });
 }