pkg/(unit)test: include a copy of old matcher

test/test_common.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.
+
+library unittest.matcher.test_common;
+
+import 'dart:collection';
+
+import 'package:unittest/unittest.dart';
+
+class Widget {
+  int price;
+}
+
+class HasPrice extends CustomMatcher {
+  HasPrice(matcher) : super("Widget with a price that is", "price", matcher);
+  featureValueOf(actual) => actual.price;
+}
+
+class SimpleIterable extends IterableBase<int> {
+  final int count;
+
+  SimpleIterable(this.count);
+
+  bool contains(int val) => count < val ? false : true;
+
+  bool any(bool f(element)) {
+    for (var i = 0; i <= count; i++) {
+      if (f(i)) return true;
+    }
+    return false;
+  }
+
+  String toString() => "<[$count]>";
+
+  Iterator get iterator {
+    return new _SimpleIterator(count);
+  }
+}
+
+class _SimpleIterator implements Iterator<int> {
+  int _count;
+  int _current;
+
+  _SimpleIterator(this._count);
+
+  bool moveNext() {
+    if (_count > 0) {
+      _current = _count;
+      _count--;
+      return true;
+    }
+    _current = null;
+    return false;
+  }
+
+  int get current => _current;
+}