Update unittest to new package layout.

pkg/unittest/collection_matchers.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.
-
-/**
- * Returns a matcher which matches [Collection]s in which all elements
- * match the given [matcher].
- */
-Matcher everyElement(matcher) => new _EveryElement(wrapMatcher(matcher));
-
-class _EveryElement extends _CollectionMatcher {
-  Matcher _matcher;
-
-  _EveryElement(Matcher this._matcher);
-
-  bool matches(item, MatchState matchState) {
-    if (item is! Iterable) {
-      return false;
-    }
-    var i = 0;
-    for (var element in item) {
-      if (!_matcher.matches(element, matchState)) {
-        matchState.state = {
-            'index': i,
-            'element': element,
-            'state': matchState.state
-        };
-        return false;
-      }
-      ++i;
-    }
-    return true;
-  }
-
-  Description describe(Description description) =>
-      description.add('every element ').addDescriptionOf(_matcher);
-
-  Description describeMismatch(item, Description mismatchDescription,
-                               MatchState matchState, bool verbose) {
-    if (matchState.state != null) {
-      var index = matchState.state['index'];
-      var element = matchState.state['element'];
-      return _matcher.describeMismatch(element, mismatchDescription,
-            matchState.state['state'], verbose).add(' at position $index');
-    }
-    return super.describeMismatch(item, mismatchDescription,
-          matchState, verbose);
-  }
-}
-
-/**
- * Returns a matcher which matches [Collection]s in which at least one
- * element matches the given [matcher].
- */
-Matcher someElement(matcher) => new _SomeElement(wrapMatcher(matcher));
-
-class _SomeElement extends _CollectionMatcher {
-  Matcher _matcher;
-
-  _SomeElement(this._matcher);
-
-  bool matches(item, MatchState matchState) {
-    return item.some( (e) => _matcher.matches(e, matchState) );
-  }
-
-  Description describe(Description description) =>
-      description.add('some element ').addDescriptionOf(_matcher);
-}
-
-/**
- * Returns a matcher which matches [Iterable]s that have the same
- * length and the same elements as [expected], and in the same order.
- * This is equivalent to equals but does not recurse.
- */
-
-Matcher orderedEquals(Iterable expected) => new _OrderedEquals(expected);
-
-class _OrderedEquals extends BaseMatcher {
-  final Iterable _expected;
-  Matcher _matcher;
-
-  _OrderedEquals(this._expected) {
-    _matcher = equals(_expected, 1);
-  }
-
-  bool matches(item, MatchState matchState) =>
-      (item is Iterable) && _matcher.matches(item, matchState);
-
-  Description describe(Description description) =>
-      description.add('equals ').addDescriptionOf(_expected).add(' ordered');
-
-  Description describeMismatch(item, Description mismatchDescription,
-                               MatchState matchState, bool verbose) {
-    if (item is !Iterable) {
-      return mismatchDescription.add('not an Iterable');
-    } else {
-      return _matcher.describeMismatch(item, mismatchDescription,
-          matchState, verbose);
-    }
-  }
-}
-/**
- * Returns a matcher which matches [Iterable]s that have the same
- * length and the same elements as [expected], but not necessarily in
- * the same order. Note that this is O(n^2) so should only be used on
- * small objects.
- */
-Matcher unorderedEquals(Iterable expected) =>
-    new _UnorderedEquals(expected);
-
-class _UnorderedEquals extends BaseMatcher {
-  Iterable _expected;
-
-  _UnorderedEquals(Iterable this._expected);
-
-  String _test(item) {
-    if (item is !Iterable) {
-      return 'not iterable';
-    }
-    // Check the lengths are the same.
-    var expectedLength = 0;
-    if (_expected is Collection) {
-      Collection cast = _expected; // "_expected as Collection"
-      expectedLength = cast.length;
-    } else {
-      for (var element in _expected) {
-        ++expectedLength;
-      }
-    }
-    var actualLength = 0;
-    if (item is Collection) {
-      actualLength = item.length;
-    } else {
-      for (var element in item) {
-        ++actualLength;
-      }
-    }
-    if (expectedLength > actualLength) {
-      return 'has too few elements (${actualLength} < ${expectedLength})';
-    } else if (expectedLength < actualLength) {
-      return 'has too many elements (${actualLength} > ${expectedLength})';
-    }
-    List<bool> matched = new List<bool>(actualLength);
-    for (var i = 0; i < actualLength; i++) {
-      matched[i] = false;
-    }
-    var expectedPosition = 0;
-    for (var expectedElement in _expected) {
-      var actualPosition = 0;
-      var gotMatch = false;
-      for (var actualElement in item) {
-        if (!matched[actualPosition]) {
-          if (expectedElement == actualElement) {
-            matched[actualPosition] = gotMatch = true;
-            break;
-          }
-        }
-        ++actualPosition;
-      }
-      if (!gotMatch) {
-        Description reason = new StringDescription();
-        reason.add('has no match for element ').
-            addDescriptionOf(expectedElement).
-            add(' at position ${expectedPosition}');
-        return reason.toString();
-      }
-      ++expectedPosition;
-    }
-    return null;
-  }
-
-  bool matches(item, MatchState mismatchState) => (_test(item) == null);
-
-  Description describe(Description description) =>
-      description.add('equals ').addDescriptionOf(_expected).add(' unordered');
-
-  Description describeMismatch(item, Description mismatchDescription,
-                               MatchState matchState, bool verbose) =>
-      mismatchDescription.add(_test(item));
-}
-
-/**
- * Collection matchers match against [Collection]s. We add this intermediate
- * class to give better mismatch error messages than the base Matcher class.
- */
-/* abstract */ class _CollectionMatcher extends BaseMatcher {
-  const _CollectionMatcher();
-  Description describeMismatch(item, Description mismatchDescription,
-                               MatchState matchState, bool verbose) {
-    if (item is !Collection) {
-      return mismatchDescription.
-          addDescriptionOf(item).
-          add(' not a collection');
-    } else {
-      return super.describeMismatch(item, mismatchDescription, matchState,
-        verbose);
-    }
-  }
-}