Add type-asserting wrapper constructors.

test/typed_wrapper/set_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 "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 = DelegatingSet.typed/*<int>*/(
+          new Set<Object>.from([1, 2, 3, 4, 5]));
+      emptyWrapper = DelegatingSet.typed/*<int>*/(new Set<Object>());
+    });
+
+    test("add()", () {
+      wrapper.add(1);
+      wrapper.add(6);
+      expect(wrapper, unorderedEquals([1, 2, 3, 4, 5, 6]));
+    });
+
+    test("addAll()", () {
+      wrapper.addAll([1, 6, 7]);
+      expect(wrapper, unorderedEquals([1, 2, 3, 4, 5, 6, 7]));
+    });
+
+    test("clear()", () {
+      wrapper.clear();
+      expect(wrapper, isEmpty);
+    });
+
+    test("containsAll()", () {
+      expect(wrapper.containsAll([1, 3, 5]), isTrue);
+      expect(wrapper.containsAll([1, 3, 6]), isFalse);
+      expect(wrapper.containsAll([1, 3, "foo"]), isFalse);
+    });
+
+    test("difference()", () {
+      expect(wrapper.difference(new Set.from([1, 3, 6])),
+          unorderedEquals([2, 4, 5]));
+    });
+
+    test("intersection()", () {
+      expect(wrapper.intersection(new Set.from([1, 3, 6, "foo"])),
+          unorderedEquals([1, 3]));
+    });
+
+    test("lookup()", () {
+      expect(wrapper.lookup(1), equals(1));
+      expect(wrapper.lookup(7), isNull);
+      expect(wrapper.lookup("foo"), isNull);
+    });
+
+    test("remove()", () {
+      expect(wrapper.remove(3), isTrue);
+      expect(wrapper, unorderedEquals([1, 2, 4, 5]));
+
+      expect(wrapper.remove(3), isFalse);
+      expect(wrapper.remove("foo"), isFalse);
+    });
+
+    test("removeAll()", () {
+      wrapper.removeAll([1, 3, 6, "foo"]);
+      expect(wrapper, unorderedEquals([2, 4, 5]));
+    });
+
+    test("removeWhere()", () {
+      wrapper.removeWhere((i) => i.isOdd);
+      expect(wrapper, unorderedEquals([2, 4]));
+    });
+
+    test("retainAll()", () {
+      wrapper.retainAll([1, 3, 6, "foo"]);
+      expect(wrapper, unorderedEquals([1, 3]));
+    });
+
+    test("retainWhere()", () {
+      wrapper.retainWhere((i) => i.isOdd);
+      expect(wrapper, unorderedEquals([1, 3, 5]));
+    });
+
+    test("union()", () {
+      expect(wrapper.union(new Set.from([5, 6, 7])),
+          unorderedEquals([1, 2, 3, 4, 5, 6, 7]));
+    });
+  });
+
+  group("with invalid types", () {
+    var inner;
+    var wrapper;
+    setUp(() {
+      inner = new Set<Object>.from(["foo", "bar", "baz"]);
+      wrapper = DelegatingSet.typed/*<int>*/(inner);
+    });
+
+    group("throws a CastError for", () {
+      test("difference()", () {
+        var result = wrapper.difference(new Set.from([1, 3, 6]));
+        expect(() => result.first, throwsCastError);
+      });
+
+      test("intersection()", () {
+        var result = wrapper.intersection(new Set.from([1, 3, 6, "foo"]));
+        expect(() => result.first, throwsCastError);
+      });
+
+      test("lookup()", () {
+        expect(() => wrapper.lookup("foo"), throwsCastError);
+      });
+
+      test("removeWhere()", () {
+        expect(() => wrapper.removeWhere(expectAsync((_) => false, count: 0)),
+            throwsCastError);
+      });
+
+      test("retainWhere()", () {
+        expect(() => wrapper.retainWhere(expectAsync((_) => false, count: 0)),
+            throwsCastError);
+      });
+
+      test("union()", () {
+        var result = wrapper.union(new Set.from([5, 6, 7]));
+        expect(() => result.first, throwsCastError);
+      });
+    });
+
+    group("doesn't throw a CastError for", () {
+      test("add()", () {
+        wrapper.add(6);
+        expect(inner, unorderedEquals(["foo", "bar", "baz", 6]));
+      });
+
+      test("addAll()", () {
+        wrapper.addAll([6, 7]);
+        expect(inner, unorderedEquals(["foo", "bar", "baz", 6, 7]));
+      });
+
+      test("clear()", () {
+        wrapper.clear();
+        expect(wrapper, isEmpty);
+      });
+
+      test("containsAll()", () {
+        expect(wrapper.containsAll(["foo", "bar"]), isTrue);
+        expect(wrapper.containsAll(["foo", "bar", 1]), isFalse);
+      });
+
+      test("lookup()", () {
+        expect(wrapper.lookup(1), isNull);
+        expect(wrapper.lookup("zap"), isNull);
+      });
+
+      test("remove()", () {
+        expect(wrapper.remove("foo"), isTrue);
+        expect(inner, unorderedEquals(["bar", "baz"]));
+
+        expect(wrapper.remove(3), isFalse);
+        expect(wrapper.remove("foo"), isFalse);
+      });
+
+      test("removeAll()", () {
+        wrapper.removeAll([1, "foo", "baz"]);
+        expect(inner, unorderedEquals(["bar"]));
+      });
+
+      test("retainAll()", () {
+        wrapper.retainAll([1, "foo", "baz"]);
+        expect(inner, unorderedEquals(["foo", "baz"]));
+      });
+    });
+  }, skip: "Re-enable this when test can run DDC (test#414).");
+}