Add typed wrapper functions to delegate classes.

test/typed_wrapper/stream_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:async';
+
+import "package:async/async.dart";
+import "package:async/src/typed/stream.dart";
+import "package:test/test.dart";
+
+import '../utils.dart';
+
+void main() {
+  group("with valid types, forwards", () {
+    var controller;
+    var wrapper;
+    var emptyWrapper;
+    var singleWrapper;
+    var errorWrapper;
+    setUp(() {
+      controller = new StreamController<Object>()
+          ..add(1)..add(2)..add(3)..add(4)..add(5)..close();
+
+      // TODO(nweiz): Use public methods when test#414 is fixed and we can run
+      // this on DDC.
+      wrapper = new TypeSafeStream<int>(controller.stream);
+      emptyWrapper = new TypeSafeStream<int>(new Stream<Object>.empty());
+      singleWrapper = new TypeSafeStream<int>(
+          new Stream<Object>.fromIterable([1]));
+      errorWrapper = new TypeSafeStream<int>(
+          new Stream<Object>.fromFuture(new Future.error("oh no")));
+    });
+
+    test("first", () {
+      expect(wrapper.first, completion(equals(1)));
+      expect(emptyWrapper.first, throwsStateError);
+    });
+
+    test("last", () {
+      expect(wrapper.last, completion(equals(5)));
+      expect(emptyWrapper.last, throwsStateError);
+    });
+
+    test("single", () {
+      expect(wrapper.single, throwsStateError);
+      expect(singleWrapper.single, completion(equals(1)));
+    });
+
+    test("isBroadcast", () {
+      expect(wrapper.isBroadcast, isFalse);
+      var broadcastWrapper = new TypeSafeStream<int>(
+          new Stream<Object>.empty().asBroadcastStream());
+      expect(broadcastWrapper.isBroadcast, isTrue);
+    });
+
+    test("isEmpty", () {
+      expect(wrapper.isEmpty, completion(isFalse));
+      expect(emptyWrapper.isEmpty, completion(isTrue));
+    });
+
+    test("length", () {
+      expect(wrapper.length, completion(equals(5)));
+      expect(emptyWrapper.length, completion(equals(0)));
+    });
+
+    group("asBroadcastStream()", () {
+      test("with no parameters", () {
+        var broadcast = wrapper.asBroadcastStream();
+        expect(broadcast.toList(), completion(equals([1, 2, 3, 4, 5])));
+        expect(broadcast.toList(), completion(equals([1, 2, 3, 4, 5])));
+      });
+
+      test("with onListen", () {
+        var broadcast = wrapper.asBroadcastStream(
+            onListen: expectAsync((subscription) {
+          expect(subscription, new isInstanceOf<StreamSubscription<int>>());
+          subscription.pause();
+        }));
+
+        broadcast.listen(null);
+        expect(controller.isPaused, isTrue);
+      });
+
+      test("with onCancel", () {
+        var broadcast = wrapper.asBroadcastStream(
+            onCancel: expectAsync((subscription) {
+          expect(subscription, new isInstanceOf<StreamSubscription<int>>());
+          subscription.pause();
+        }));
+
+        broadcast.listen(null).cancel();
+        expect(controller.isPaused, isTrue);
+      });
+    });
+
+    test("asyncExpand()", () {
+      expect(
+          wrapper.asyncExpand((i) => new Stream.fromIterable([i, i])).toList(),
+          completion(equals([1, 1, 2, 2, 3, 3, 4, 4, 5, 5])));
+    });
+
+    test("asyncMap()", () {
+      expect(wrapper.asyncMap((i) => new Future.value(i * 2)).toList(),
+          completion(equals([2, 4, 6, 8, 10])));
+    });
+
+    group("distinct()", () {
+      test("without equals", () {
+        expect(wrapper.distinct().toList(),
+            completion(equals([1, 2, 3, 4, 5])));
+
+        expect(
+            new TypeSafeStream<int>(
+                    new Stream<Object>.fromIterable([1, 1, 2, 2, 3, 3]))
+                .distinct().toList(),
+            completion(equals([1, 2, 3])));
+      });
+
+      test("with equals", () {
+        expect(wrapper.distinct((i1, i2) => (i1 ~/ 2 == i2 ~/ 2)).toList(),
+            completion(equals([1, 2, 4])));
+      });
+    });
+
+    group("drain()", () {
+      test("without a value", () {
+        expect(wrapper.drain(), completes);
+        expect(() => wrapper.drain(), throwsStateError);
+      });
+
+      test("with a value", () {
+        expect(wrapper.drain(12), completion(equals(12)));
+      });
+    });
+
+    test("expand()", () {
+      expect(
+          wrapper.expand((i) => [i, i]).toList(),
+          completion(equals([1, 1, 2, 2, 3, 3, 4, 4, 5, 5])));
+    });
+
+    group("firstWhere()", () {
+      test("finding a value", () {
+        expect(wrapper.firstWhere((i) => i > 3), completion(equals(4)));
+      });
+
+      test("finding no value", () {
+        expect(wrapper.firstWhere((i) => i > 5), throwsStateError);
+      });
+
+      test("with a default value", () {
+        expect(wrapper.firstWhere((i) => i > 5, defaultValue: () => "value"),
+            completion(equals("value")));
+      });
+    });
+
+    group("lastWhere()", () {
+      test("finding a value", () {
+        expect(wrapper.lastWhere((i) => i < 3), completion(equals(2)));
+      });
+
+      test("finding no value", () {
+        expect(wrapper.lastWhere((i) => i > 5), throwsStateError);
+      });
+
+      test("with a default value", () {
+        expect(wrapper.lastWhere((i) => i > 5, defaultValue: () => "value"),
+            completion(equals("value")));
+      });
+    });
+
+    group("singleWhere()", () {
+      test("finding a single value", () {
+        expect(wrapper.singleWhere((i) => i == 3), completion(equals(3)));
+      });
+
+      test("finding no value", () {
+        expect(wrapper.singleWhere((i) => i == 6), throwsStateError);
+      });
+
+      test("finding multiple values", () {
+        expect(wrapper.singleWhere((i) => i.isOdd), throwsStateError);
+      });
+    });
+
+    test("fold()", () {
+      expect(wrapper.fold("foo", (previous, i) => previous + i.toString()),
+          completion(equals("foo12345")));
+    });
+
+    test("forEach()", () async {
+      emptyWrapper.forEach(expectAsync((_) {}, count: 0));
+
+      var results = [];
+      await wrapper.forEach(results.add);
+      expect(results, equals([1, 2, 3, 4, 5]));
+    });
+
+    group("handleError()", () {
+      test("without a test", () {
+        expect(errorWrapper.handleError(expectAsync((error) {
+          expect(error, equals("oh no"));
+        })).toList(), completion(isEmpty));
+      });
+
+      test("with a matching test", () {
+        expect(errorWrapper.handleError(expectAsync((error) {
+          expect(error, equals("oh no"));
+        }), test: expectAsync((error) {
+          expect(error, equals("oh no"));
+          return true;
+        })).toList(), completion(isEmpty));
+      });
+
+      test("with a matching test", () {
+        expect(errorWrapper.handleError(expectAsync((_) {}, count: 0),
+            test: expectAsync((error) {
+          expect(error, equals("oh no"));
+          return false;
+        })).toList(), throwsA("oh no"));
+      });
+    });
+
+    group("listen()", () {
+      test("with a callback", () {
+        var subscription;
+        subscription = wrapper.listen(expectAsync((data) {
+          expect(data, equals(1));
+
+          subscription.onData(expectAsync((data) {
+            expect(data, equals(2));
+            subscription.cancel();
+          }));
+        }));
+      });
+
+      test("with a null callback", () {
+        expect(wrapper.listen(null).asFuture(), completes);
+      });
+    });
+
+    test("map()", () {
+      expect(wrapper.map((i) => i * 2).toList(),
+          completion(equals([2, 4, 6, 8, 10])));
+    });
+
+    test("pipe()", () {
+      var consumer = new StreamController<T>();
+      expect(wrapper.pipe(consumer), completes);
+      expect(consumer.stream.toList(), completion(equals([1, 2, 3, 4, 5])));
+    });
+
+    test("reduce()", () {
+      expect(wrapper.reduce((value, i) => value + i), completion(equals(15)));
+      expect(emptyWrapper.reduce((value, i) => value + i), throwsStateError);
+    });
+
+    test("skipWhile()", () {
+      expect(wrapper.skipWhile((i) => i < 3).toList(),
+          completion(equals([3, 4, 5])));
+    });
+
+    test("takeWhile()", () {
+      expect(wrapper.takeWhile((i) => i < 3).toList(),
+          completion(equals([1, 2])));
+    });
+
+    test("toSet()", () {
+      expect(wrapper.toSet(), completion(unorderedEquals([1, 2, 3, 4, 5])));
+      expect(
+          new TypeSafeStream<int>(
+                  new Stream<Object>.fromIterable([1, 1, 2, 2, 3, 3]))
+              .toSet(),
+          completion(unorderedEquals([1, 2, 3])));
+    });
+
+    test("transform()", () {
+     var transformer = new StreamTransformer<int, String>.fromHandlers(
+         handleData: (data, sink) {
+       sink.add(data.toString());
+     });
+
+      expect(wrapper.transform(transformer).toList(),
+          completion(equals(["1", "2", "3", "4", "5"])));
+    });
+
+    test("where()", () {
+      expect(wrapper.where((i) => i.isOdd).toList(),
+          completion(equals([1, 3, 5])));
+    });
+
+    group("any()", () {
+      test("with matches", () {
+        expect(wrapper.any((i) => i > 3), completion(isTrue));
+      });
+
+      test("without matches", () {
+        expect(wrapper.any((i) => i > 5), completion(isFalse));
+      });
+    });
+
+    group("every()", () {
+      test("with all matches", () {
+        expect(wrapper.every((i) => i < 6), completion(isTrue));
+      });
+
+      test("with some non-matches", () {
+        expect(wrapper.every((i) => i > 3), completion(isFalse));
+      });
+    });
+
+    group("skip()", () {
+      test("with a valid index", () {
+        expect(wrapper.skip(3).toList(), completion(equals([4, 5])));
+      });
+
+      test("with a longer index than length", () {
+        expect(wrapper.skip(6).toList(), completion(isEmpty));
+      });
+
+      test("with a negative index", () {
+        expect(() => wrapper.skip(-1), throwsArgumentError);
+      });
+    });
+
+    group("take()", () {
+      test("with a valid index", () {
+        expect(wrapper.take(3).toList(), completion(equals([1, 2, 3])));
+      });
+
+      test("with a longer index than length", () {
+        expect(wrapper.take(6).toList(), completion(equals([1, 2, 3, 4, 5])));
+      });
+
+      test("with a negative index", () {
+        expect(wrapper.take(-1).toList(), completion(isEmpty));
+      });
+    });
+
+    group("elementAt()", () {
+      test("with a valid index", () {
+        expect(wrapper.elementAt(3), completion(equals(4)));
+      });
+
+      test("with too high an index", () {
+        expect(wrapper.elementAt(6), throwsRangeError);
+      });
+
+      test("with a negative index", () {
+        expect(wrapper.elementAt(-1), throwsArgumentError);
+      });
+    });
+
+    group("contains()", () {
+      test("with an element", () {
+        expect(wrapper.contains(2), completion(isTrue));
+      });
+
+      test("with a non-element", () {
+        expect(wrapper.contains(6), completion(isFalse));
+      });
+
+      test("with a non-element of a different type", () {
+        expect(wrapper.contains("foo"), completion(isFalse));
+      });
+    });
+
+    group("join()", () {
+      test("without a separator", () {
+        expect(wrapper.join(), completion(equals("12345")));
+      });
+
+      test("with a separator", () {
+        expect(wrapper.join(" "), completion(equals("1 2 3 4 5")));
+      });
+    });
+
+    test("toString()", () {
+      expect(wrapper.toString(), contains("Stream"));
+    });
+  });
+
+  group("with invalid types", () {
+    var wrapper;
+    var singleWrapper;
+    setUp(() {
+      wrapper = new TypeSafeStream<int>(
+          new Stream<Object>.fromIterable(["foo", "bar", "baz"]));
+      singleWrapper = new TypeSafeStream<int>(
+          new Stream<Object>.fromIterable(["foo"]));
+    });
+
+    group("throws a CastError for", () {
+      test("first", () {
+        expect(wrapper.first, throwsCastError);
+      });
+
+      test("last", () {
+        expect(wrapper.last, throwsCastError);
+      });
+
+      test("single", () {
+        expect(singleWrapper.single, throwsCastError);
+      });
+
+      test("asBroadcastStream()", () {
+        var broadcast = wrapper.asBroadcastStream();
+        expect(broadcast.first, throwsCastError);
+      });
+
+      test("asyncExpand()", () {
+        expect(wrapper.asyncExpand(expectAsync((_) {}, count: 0)).first,
+            throwsCastError);
+      });
+
+      test("asyncMap()", () {
+        expect(wrapper.asyncMap(expectAsync((_) {}, count: 0)).first,
+            throwsCastError);
+      });
+
+      group("distinct()", () {
+        test("without equals", () {
+          expect(wrapper.distinct().first, throwsCastError);
+        });
+
+        test("with equals", () {
+          expect(wrapper.distinct(expectAsync((_, __) {}, count: 0)).first,
+              throwsCastError);
+        });
+      });
+
+      test("expand()", () {
+        expect(wrapper.expand(expectAsync((_) {}, count: 0)).first,
+            throwsCastError);
+      });
+
+      test("firstWhere()", () {
+        expect(wrapper.firstWhere(expectAsync((_) {}, count: 0)),
+            throwsCastError);
+      });
+
+      test("lastWhere()", () {
+        expect(wrapper.lastWhere(expectAsync((_) {}, count: 0)),
+            throwsCastError);
+      });
+
+      test("singleWhere()", () {
+        expect(wrapper.singleWhere(expectAsync((_) {}, count: 0)),
+            throwsCastError);
+      });
+
+      test("fold()", () {
+        expect(wrapper.fold("foo", expectAsync((_, __) {}, count: 0)),
+            throwsCastError);
+      });
+
+      test("forEach()", () async {
+        expect(wrapper.forEach(expectAsync((_) {}, count: 0)), throwsCastError);
+      });
+
+      test("handleError()", () {
+        expect(wrapper.handleError(expectAsync((_) {}, count: 0)).first,
+            throwsCastError);
+      });
+
+      test("listen()", () {
+        expect(() => wrapper.take(1).listen(expectAsync((_) {}, count: 0)),
+            throwsZonedCastError);
+      });
+
+      test("map()", () {
+        expect(wrapper.map(expectAsync((_) {}, count: 0)).first,
+            throwsCastError);
+      });
+
+      test("reduce()", () {
+        expect(wrapper.reduce(expectAsync((_, __) {}, count: 0)),
+            throwsCastError);
+      });
+
+      test("skipWhile()", () {
+        expect(wrapper.skipWhile(expectAsync((_) {}, count: 0)).first,
+            throwsCastError);
+      });
+
+      test("takeWhile()", () {
+        expect(wrapper.takeWhile(expectAsync((_) {}, count: 0)).first,
+            throwsCastError);
+      });
+
+      test("toList()", () async {
+        var list = await wrapper.toList();
+        expect(() => list.first, throwsCastError);
+      }, skip: "Re-enable this when test can run DDC (test#414).");
+
+      test("toSet()", () async {
+        var asSet = await wrapper.toSet();
+        expect(() => asSet.first, throwsCastError);
+      }, skip: "Re-enable this when test can run DDC (test#414).");
+
+      test("where()", () {
+        expect(wrapper.where(expectAsync((_) {}, count: 0)).first,
+            throwsCastError);
+      });
+
+      test("any()", () {
+        expect(wrapper.any(expectAsync((_) {}, count: 0)), throwsCastError);
+      });
+
+      test("every()", () {
+        expect(wrapper.every(expectAsync((_) {}, count: 0)), throwsCastError);
+      });
+
+      test("skip()", () {
+        expect(wrapper.skip(1).first, throwsCastError);
+      });
+
+      test("take()", () {
+        expect(wrapper.take(1).first, throwsCastError);
+      });
+
+      test("elementAt()", () {
+        expect(wrapper.elementAt(1), throwsCastError);
+      });
+    });
+
+    group("doesn't throw a CastError for", () {
+      test("single", () {
+        expect(wrapper.single, throwsStateError);
+      });
+
+      test("length", () {
+        expect(wrapper.length, completion(equals(3)));
+      });
+
+      test("isBroadcast", () {
+        expect(wrapper.isBroadcast, isFalse);
+      });
+
+      test("isEmpty", () {
+        expect(wrapper.isEmpty, completion(isFalse));
+      });
+
+      group("drain()", () {
+        test("without a value", () {
+          expect(wrapper.drain(), completes);
+          expect(() => wrapper.drain(), throwsStateError);
+        });
+
+        test("with a value", () {
+          expect(wrapper.drain(12), completion(equals(12)));
+        });
+      });
+
+      test("skip()", () {
+        expect(() => wrapper.skip(-1), throwsArgumentError);
+      });
+
+      group("elementAt()", () {
+        test("with too high an index", () {
+          expect(wrapper.elementAt(6), throwsRangeError);
+        });
+
+        test("with a negative index", () {
+          expect(wrapper.elementAt(-1), throwsArgumentError);
+        });
+      });
+
+      group("contains()", () {
+        test("with an element", () {
+          expect(wrapper.contains("foo"), completion(isTrue));
+        });
+
+        test("with a non-element", () {
+          expect(wrapper.contains("qux"), completion(isFalse));
+        });
+
+        test("with a non-element of a different type", () {
+          expect(wrapper.contains(1), completion(isFalse));
+        });
+      });
+
+      group("join()", () {
+        test("without a separator", () {
+          expect(wrapper.join(), completion(equals("foobarbaz")));
+        });
+
+        test("with a separator", () {
+          expect(wrapper.join(" "), completion(equals("foo bar baz")));
+        });
+      });
+
+      test("toString()", () {
+        expect(wrapper.toString(), contains("Stream"));
+      });
+    });
+  });
+}