Re-apply "Remove unittest and matcher from the repo."

pkg/unittest/test/expect_async_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.
-
-library unittest.expect_async_test;
-
-import 'dart:async';
-
-import 'package:metatest/metatest.dart';
-import 'package:unittest/unittest.dart';
-
-void main() => initTests(_test);
-
-void _test(message) {
-  initMetatest(message);
-
-  var count = 0;
-
-  expectTestsPass('expect async test', () {
-    test('expectAsync zero params', () {
-      new Future.sync(expectAsync(() {
-        ++count;
-      }));
-    });
-
-    test('expectAsync 1 param', () {
-      var func = expectAsync((arg) {
-        expect(arg, 0);
-        ++count;
-      });
-      new Future.sync(() => func(0));
-    });
-
-    test('expectAsync 2 param', () {
-      var func = expectAsync((arg0, arg1) {
-        expect(arg0, 0);
-        expect(arg1, 1);
-        ++count;
-      });
-      new Future.sync(() => func(0, 1));
-    });
-
-    test('single arg to Future.catchError', () {
-      var func = expectAsync((error) {
-        expect(error, isStateError);
-        ++count;
-      });
-
-      new Future(() {
-        throw new StateError('test');
-      }).catchError(func);
-    });
-
-    test('2 args to Future.catchError', () {
-      var func = expectAsync((error, stack) {
-        expect(error, isStateError);
-        expect(stack is StackTrace, isTrue);
-        ++count;
-      });
-
-      new Future(() {
-        throw new StateError('test');
-      }).catchError(func);
-    });
-
-    test('zero of two optional positional args', () {
-      var func = expectAsync(([arg0 = true, arg1 = true]) {
-        expect(arg0, isTrue);
-        expect(arg1, isTrue);
-        ++count;
-      });
-
-      new Future.sync(() => func());
-    });
-
-    test('one of two optional positional args', () {
-      var func = expectAsync(([arg0 = true, arg1 = true]) {
-        expect(arg0, isFalse);
-        expect(arg1, isTrue);
-        ++count;
-      });
-
-      new Future.sync(() => func(false));
-    });
-
-    test('two of two optional positional args', () {
-      var func = expectAsync(([arg0 = true, arg1 = true]) {
-        expect(arg0, isFalse);
-        expect(arg1, isNull);
-        ++count;
-      });
-
-      new Future.sync(() => func(false, null));
-    });
-
-    test('verify count', () {
-      expect(count, 8);
-    });
-  });
-}