Migrate test block 3 to Dart 2.0.

tests/corelib_strong/collection_removes_test.dart

-// Copyright (c) 2011, 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.
-
-import 'dart:collection';
-import "package:expect/expect.dart";
-
-testRemove(base) {
-  int length = base.length;
-  for (int i = 0; i < length; i++) {
-    Expect.isFalse(base.isEmpty);
-    base.remove(base.first);
-  }
-  Expect.isTrue(base.isEmpty);
-}
-
-testRemoveAll(base, Iterable removes) {
-  Set retained = new Set();
-  for (var element in base) {
-    if (!removes.contains(element)) {
-      retained.add(element);
-    }
-  }
-  String name = "$base.removeAll($removes) -> $retained";
-  base.removeAll(removes);
-  for (var value in base) {
-    Expect.isFalse(removes.contains(value), "$name: Found $value");
-  }
-  for (var value in retained) {
-    Expect.isTrue(base.contains(value), "$name: Found $value");
-  }
-}
-
-testRetainAll(base, Iterable retains) {
-  Set retained = new Set();
-  for (var element in base) {
-    if (retains.contains(element)) {
-      retained.add(element);
-    }
-  }
-  String name = "$base.retainAll($retains) -> $retained";
-  base.retainAll(retains);
-  for (var value in base) {
-    Expect.isTrue(retains.contains(value), "$name: Found $value");
-  }
-  for (var value in retained) {
-    Expect.isTrue(base.contains(value), "$name: Found $value");
-  }
-}
-
-testRemoveWhere(base, bool test(value)) {
-  Set retained = new Set();
-  for (var element in base) {
-    if (!test(element)) {
-      retained.add(element);
-    }
-  }
-  String name = "$base.removeWhere(...) -> $retained";
-  base.removeWhere(test);
-  for (var value in base) {
-    Expect.isFalse(test(value), "$name: Found $value");
-  }
-  for (var value in retained) {
-    Expect.isTrue(base.contains(value), "$name: Found $value");
-  }
-}
-
-testRetainWhere(base, bool test(value)) {
-  Set retained = new Set();
-  for (var element in base) {
-    if (test(element)) {
-      retained.add(element);
-    }
-  }
-  String name = "$base.retainWhere(...) -> $retained";
-  base.retainWhere(test);
-  for (var value in base) {
-    Expect.isTrue(test(value), "$name: Found $value");
-  }
-  for (var value in retained) {
-    Expect.isTrue(base.contains(value), "$name: Found $value");
-  }
-}
-
-void main() {
-  var collections = [
-    [],
-    [1],
-    [2],
-    [1, 2],
-    [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
-    [1, 3, 5, 7, 9],
-    [2, 4, 6, 8, 10]
-  ];
-  for (var base in collections) {
-    for (var delta in collections) {
-      testRemove(base.toList());
-      testRemove(base.toSet());
-
-      var deltaSet = delta.toSet();
-      testRemoveWhere(base.toList(), deltaSet.contains);
-      testRetainWhere(base.toList(), (e) => !deltaSet.contains(e));
-
-      testRemoveAll(base.toSet(), delta);
-      testRemoveAll(base.toSet(), deltaSet);
-      testRetainAll(base.toSet(), delta);
-      testRetainAll(base.toSet(), deltaSet);
-      testRemoveWhere(base.toSet(), deltaSet.contains);
-      testRetainWhere(base.toSet(), (e) => !deltaSet.contains(e));
-
-      // Test the ListBase class's List implementation.
-      testRemoveWhere(new MyList(base.toList()), deltaSet.contains);
-      testRetainWhere(new MyList(base.toList()), (e) => !deltaSet.contains(e));
-    }
-  }
-}
-
-class MyList<E> extends ListBase<E> {
-  List<E> _source;
-  MyList(this._source);
-  int get length => _source.length;
-  void set length(int length) {
-    _source.length = length;
-  }
-
-  E operator [](int index) => _source[index];
-  void operator []=(int index, E value) {
-    _source[index] = value;
-  }
-}