Add type-asserting wrapper constructors.

test/typed_wrapper/queue_test.dart

+// Copyright (c) 2016, 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:collection/collection.dart";
+import "package:test/test.dart";
+
+import '../utils.dart';
+
+void main() {
+  group("with valid types, forwards", () {
+    var wrapper;
+    var emptyWrapper;
+    setUp(() {
+      wrapper = DelegatingQueue.typed/*<int>*/(
+          new Queue<Object>.from([1, 2, 3, 4, 5]));
+      emptyWrapper = DelegatingQueue.typed/*<int>*/(new Queue<Object>());
+    });
+
+    test("add()", () {
+      wrapper.add(6);
+      wrapper.add(7);
+      expect(wrapper, equals([1, 2, 3, 4, 5, 6, 7]));
+    });
+
+    test("addAll()", () {
+      wrapper.addAll([6, 7, 8]);
+      expect(wrapper, equals([1, 2, 3, 4, 5, 6, 7, 8]));
+    });
+
+    test("addFirst()", () {
+      wrapper.addFirst(6);
+      wrapper.addFirst(7);
+      expect(wrapper, equals([7, 6, 1, 2, 3, 4, 5]));
+    });
+
+    test("addLast()", () {
+      wrapper.addLast(6);
+      wrapper.addLast(7);
+      expect(wrapper, equals([1, 2, 3, 4, 5, 6, 7]));
+    });
+
+    test("clear()", () {
+      wrapper.clear();
+      expect(wrapper, isEmpty);
+    });
+
+    test("remove()", () {
+      expect(wrapper.remove(3), isTrue);
+      expect(wrapper, equals([1, 2, 4, 5]));
+
+      expect(wrapper.remove(3), isFalse);
+      expect(wrapper.remove("foo"), isFalse);
+    });
+
+    test("removeWhere()", () {
+      wrapper.removeWhere((i) => i.isOdd);
+      expect(wrapper, equals([2, 4]));
+    });
+
+    test("retainWhere()", () {
+      wrapper.retainWhere((i) => i.isOdd);
+      expect(wrapper, equals([1, 3, 5]));
+    });
+
+    test("removeLast()", () {
+      expect(wrapper.removeLast(), equals(5));
+      expect(wrapper, equals([1, 2, 3, 4]));
+
+      expect(() => emptyWrapper.removeLast(), throwsStateError);
+    });
+
+    test("removeFirst()", () {
+      expect(wrapper.removeFirst(), equals(1));
+      expect(wrapper, equals([2, 3, 4, 5]));
+
+      expect(() => emptyWrapper.removeFirst(), throwsStateError);
+    });
+  });
+
+  group("with invalid types", () {
+    var inner;
+    var wrapper;
+    setUp(() {
+      inner = new Queue<Object>.from(["foo", "bar", "baz"]);
+      wrapper = DelegatingQueue.typed/*<int>*/(inner);
+    });
+
+    group("throws a CastError for", () {
+      test("removeLast()", () {
+        expect(() => wrapper.removeLast(), throwsCastError);
+      });
+
+      test("removeFirst()", () {
+        expect(() => wrapper.removeFirst(), throwsCastError);
+      });
+
+      test("removeWhere()", () {
+        expect(() => wrapper.removeWhere(expectAsync((_) => false, count: 0)),
+            throwsCastError);
+      });
+
+      test("retainWhere()", () {
+        expect(() => wrapper.retainWhere(expectAsync((_) => false, count: 0)),
+            throwsCastError);
+      });
+    });
+
+    group("doesn't throw a CastError for", () {
+      test("add()", () {
+        wrapper.add(6);
+        wrapper.add(7);
+        expect(inner, equals(["foo", "bar", "baz", 6, 7]));
+      });
+
+      test("addAll()", () {
+        wrapper.addAll([6, 7, 8]);
+        expect(inner, equals(["foo", "bar", "baz", 6, 7, 8]));
+      });
+
+      test("addFirst()", () {
+        wrapper.addFirst(6);
+        wrapper.addFirst(7);
+        expect(inner, equals([7, 6, "foo", "bar", "baz"]));
+      });
+
+      test("addLast()", () {
+        wrapper.addLast(6);
+        wrapper.addLast(7);
+        expect(inner, equals(["foo", "bar", "baz", 6, 7]));
+      });
+
+      test("clear()", () {
+        wrapper.clear();
+        expect(wrapper, isEmpty);
+      });
+    });
+  }, skip: "Re-enable this when test can run DDC (test#414).");
+}