Add type-asserting wrapper constructors.

test/typed_wrapper/map_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 = DelegatingMap.typed/*<String, int>*/(
+          <Object, Object>{"foo": 1, "bar": 2, "baz": 3, "bang": 4});
+      emptyWrapper = DelegatingMap.typed/*<String, int>*/(<Object, Object>{});
+    });
+
+    test("[]", () {
+      expect(wrapper["foo"], equals(1));
+      expect(wrapper["bar"], equals(2));
+      expect(wrapper["qux"], isNull);
+      expect(wrapper[1], isNull);
+    });
+
+    test("[]=", () {
+      wrapper["foo"] = 5;
+      expect(wrapper, equals({"foo": 5, "bar": 2, "baz": 3, "bang": 4}));
+
+      wrapper["qux"] = 6;
+      expect(wrapper,
+          equals({"foo": 5, "bar": 2, "baz": 3, "bang": 4, "qux": 6}));
+    });
+
+    test("addAll()", () {
+      wrapper.addAll({"bar": 5, "qux": 6});
+      expect(wrapper,
+          equals({"foo": 1, "bar": 5, "baz": 3, "bang": 4, "qux": 6}));
+    });
+
+    test("clear()", () {
+      wrapper.clear();
+      expect(wrapper, isEmpty);
+    });
+
+    test("containsKey()", () {
+      expect(wrapper.containsKey("foo"), isTrue);
+      expect(wrapper.containsKey("qux"), isFalse);
+      expect(wrapper.containsKey(1), isFalse);
+    });
+
+    test("containsValue()", () {
+      expect(wrapper.containsValue(1), isTrue);
+      expect(wrapper.containsValue(7), isFalse);
+      expect(wrapper.containsValue("foo"), isFalse);
+    });
+
+    test("forEach()", () {
+      var results = [];
+      wrapper.forEach((key, value) => results.add([key, value]));
+      expect(results,
+          unorderedEquals([["foo", 1], ["bar", 2], ["baz", 3], ["bang", 4]]));
+
+      emptyWrapper.forEach(expectAsync((_, __) {}, count: 0));
+    });
+
+    test("isEmpty", () {
+      expect(wrapper.isEmpty, isFalse);
+      expect(emptyWrapper.isEmpty, isTrue);
+    });
+
+    test("isNotEmpty", () {
+      expect(wrapper.isNotEmpty, isTrue);
+      expect(emptyWrapper.isNotEmpty, isFalse);
+    });
+
+    test("keys", () {
+      expect(wrapper.keys, unorderedEquals(["foo", "bar", "baz", "bang"]));
+      expect(emptyWrapper.keys, isEmpty);
+    });
+
+    test("length", () {
+      expect(wrapper.length, equals(4));
+      expect(emptyWrapper.length, equals(0));
+    });
+
+    test("putIfAbsent()", () {
+      expect(wrapper.putIfAbsent("foo", expectAsync(() => null, count: 0)),
+          equals(1));
+
+      expect(wrapper.putIfAbsent("qux", () => 6), equals(6));
+      expect(wrapper,
+          equals({"foo": 1, "bar": 2, "baz": 3, "bang": 4, "qux": 6}));
+    });
+
+    test("remove()", () {
+      expect(wrapper.remove("foo"), equals(1));
+      expect(wrapper, equals({"bar": 2, "baz": 3, "bang": 4}));
+
+      expect(wrapper.remove("foo"), isNull);
+      expect(wrapper.remove(3), isNull);
+    });
+
+    test("values", () {
+      expect(wrapper.values, unorderedEquals([1, 2, 3, 4]));
+      expect(emptyWrapper.values, isEmpty);
+    });
+
+    test("toString()", () {
+      expect(wrapper.toString(), allOf([
+        startsWith("{"),
+        contains("foo: 1"),
+        contains("bar: 2"),
+        contains("baz: 3"),
+        contains("bang: 4"),
+        endsWith("}")
+      ]));
+    });
+  });
+
+  group("with invalid key types", () {
+    var inner;
+    var wrapper;
+    setUp(() {
+      inner = <Object, Object>{1: 1, 2: 2, 3: 3, 4: 4};
+      wrapper = DelegatingMap.typed/*<String, int>*/(inner);
+    });
+
+    group("throws a CastError for", () {
+      test("forEach()", () {
+        expect(() => wrapper.forEach(expectAsync((_, __) {}, count: 0)),
+            throwsCastError);
+      });
+
+      test("keys", () {
+        var lazy = wrapper.keys;
+        expect(() => lazy.first, throwsCastError);
+      });
+    });
+
+    group("doesn't throw a CastError for", () {
+      test("[]", () {
+        expect(wrapper["foo"], isNull);
+        expect(wrapper[1], equals(1));
+        expect(wrapper[7], isNull);
+      });
+
+      test("[]=", () {
+        wrapper["foo"] = 5;
+        expect(inner, equals({"foo": 5, 1: 1, 2: 2, 3: 3, 4: 4}));
+      });
+
+      test("addAll()", () {
+        wrapper.addAll({"foo": 1, "bar": 2});
+        expect(inner, equals({"foo": 1, "bar": 2, 1: 1, 2: 2, 3: 3, 4: 4}));
+      });
+
+      test("clear()", () {
+        wrapper.clear();
+        expect(wrapper, isEmpty);
+      });
+
+      test("containsKey()", () {
+        expect(wrapper.containsKey(1), isTrue);
+        expect(wrapper.containsKey(7), isFalse);
+        expect(wrapper.containsKey("foo"), isFalse);
+      });
+
+      test("containsValue()", () {
+        expect(wrapper.containsValue(1), isTrue);
+        expect(wrapper.containsValue(7), isFalse);
+        expect(wrapper.containsValue("foo"), isFalse);
+      });
+
+      test("isEmpty", () {
+        expect(wrapper.isEmpty, isFalse);
+      });
+
+      test("isNotEmpty", () {
+        expect(wrapper.isNotEmpty, isTrue);
+      });
+
+      test("length", () {
+        expect(wrapper.length, equals(4));
+      });
+
+      test("putIfAbsent()", () {
+        expect(wrapper.putIfAbsent("foo", () => 1), equals(1));
+        expect(inner, equals({"foo": 1, 1: 1, 2: 2, 3: 3, 4: 4}));
+      });
+
+      test("remove()", () {
+        expect(wrapper.remove(1), equals(1));
+        expect(inner, equals({2: 2, 3: 3, 4: 4}));
+
+        expect(wrapper.remove("foo"), isNull);
+        expect(wrapper.remove(7), isNull);
+      });
+
+      test("values", () {
+        expect(wrapper.values, unorderedEquals([1, 2, 3, 4]));
+      });
+
+      test("toString()", () {
+        expect(wrapper.toString(), allOf([
+          startsWith("{"),
+          contains("1: 1"),
+          contains("2: 2"),
+          contains("3: 3"),
+          contains("4: 4"),
+          endsWith("}")
+        ]));
+      });
+    });
+  }, skip: "Re-enable this when test can run DDC (test#414).");
+
+  group("with invalid value types", () {
+    var inner;
+    var wrapper;
+    setUp(() {
+      inner = <Object, Object>{"foo": "bar", "baz": "bang"};
+      wrapper = DelegatingMap.typed/*<String, int>*/(inner);
+    });
+
+    group("throws a CastError for", () {
+      test("forEach()", () {
+        expect(() => wrapper.forEach(expectAsync((_, __) {}, count: 0)),
+            throwsCastError);
+      });
+
+      test("[]", () {
+        expect(() => wrapper["foo"], throwsCastError);
+        expect(wrapper["qux"], isNull);
+      });
+
+      test("putIfAbsent()", () {
+        expect(() => wrapper.putIfAbsent("foo", () => 1), throwsCastError);
+      });
+
+      test("remove()", () {
+        expect(() => wrapper.remove("foo"), throwsCastError);
+      });
+
+      test("values", () {
+        var lazy = wrapper.values;
+        expect(() => lazy.first, throwsCastError);
+      });
+    });
+
+    group("doesn't throw a CastError for", () {
+      test("[]=", () {
+        wrapper["foo"] = 5;
+        expect(inner, equals({"foo": 5, "baz": "bang"}));
+      });
+
+      test("addAll()", () {
+        wrapper.addAll({"foo": 1, "qux": 2});
+        expect(inner, equals({"foo": 1, "baz": "bang", "qux": 2}));
+      });
+
+      test("clear()", () {
+        wrapper.clear();
+        expect(wrapper, isEmpty);
+      });
+
+      test("containsKey()", () {
+        expect(wrapper.containsKey("foo"), isTrue);
+        expect(wrapper.containsKey(1), isFalse);
+        expect(wrapper.containsKey("qux"), isFalse);
+      });
+
+      test("containsValue()", () {
+        expect(wrapper.containsValue("bar"), isTrue);
+        expect(wrapper.containsValue(1), isFalse);
+        expect(wrapper.containsValue("foo"), isFalse);
+      });
+
+      test("isEmpty", () {
+        expect(wrapper.isEmpty, isFalse);
+      });
+
+      test("isNotEmpty", () {
+        expect(wrapper.isNotEmpty, isTrue);
+      });
+
+      test("keys", () {
+        expect(wrapper.keys, unorderedEquals(["foo", "baz"]));
+      });
+
+      test("length", () {
+        expect(wrapper.length, equals(2));
+      });
+
+      test("putIfAbsent()", () {
+        expect(wrapper.putIfAbsent("qux", () => 1), equals(1));
+        expect(inner, equals({"foo": "bar", "baz": "bang", "qux": 1}));
+      });
+
+      test("remove()", () {
+        expect(wrapper.remove("qux"), isNull);
+        expect(wrapper.remove(7), isNull);
+      });
+
+      test("toString()", () {
+        expect(wrapper.toString(), allOf([
+          startsWith("{"),
+          contains("foo: bar"),
+          contains("baz: bang"),
+          endsWith("}")
+        ]));
+      });
+    });
+  }, skip: "Re-enable this when test can run DDC (test#414).");
+}