Update charted to 0.4.8 and roll

packages/async/test/subscription_transformer_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:test/test.dart';
+
+import 'utils.dart';
+
+void main() {
+  group("with no callbacks", () {
+    test("forwards cancellation", () async {
+      var isCanceled = false;
+      var cancelCompleter = new Completer();
+      var controller = new StreamController(onCancel: expectAsync0(() {
+        isCanceled = true;
+        return cancelCompleter.future;
+      }));
+      var subscription = controller.stream
+          .transform(subscriptionTransformer())
+          .listen(expectAsync1((_) {}, count: 0));
+
+      var cancelFired = false;
+      subscription.cancel().then(expectAsync1((_) {
+        cancelFired = true;
+      }));
+
+      await flushMicrotasks();
+      expect(isCanceled, isTrue);
+      expect(cancelFired, isFalse);
+
+      cancelCompleter.complete();
+      await flushMicrotasks();
+      expect(cancelFired, isTrue);
+
+      // This shouldn't call the onCancel callback again.
+      expect(subscription.cancel(), completes);
+    });
+
+    test("forwards pausing and resuming", () async {
+      var controller = new StreamController();
+      var subscription = controller.stream
+          .transform(subscriptionTransformer())
+          .listen(expectAsync1((_) {}, count: 0));
+
+      subscription.pause();
+      await flushMicrotasks();
+      expect(controller.isPaused, isTrue);
+
+      subscription.pause();
+      await flushMicrotasks();
+      expect(controller.isPaused, isTrue);
+
+      subscription.resume();
+      await flushMicrotasks();
+      expect(controller.isPaused, isTrue);
+
+      subscription.resume();
+      await flushMicrotasks();
+      expect(controller.isPaused, isFalse);
+    });
+
+    test("forwards pausing with a resume future", () async {
+      var controller = new StreamController();
+      var subscription = controller.stream
+          .transform(subscriptionTransformer())
+          .listen(expectAsync1((_) {}, count: 0));
+
+      var completer = new Completer();
+      subscription.pause(completer.future);
+      await flushMicrotasks();
+      expect(controller.isPaused, isTrue);
+
+      completer.complete();
+      await flushMicrotasks();
+      expect(controller.isPaused, isFalse);
+    });
+  });
+
+  group("with a cancel callback", () {
+    test("invokes the callback when the subscription is canceled", () async {
+      var isCanceled = false;
+      var callbackInvoked = false;
+      var controller = new StreamController(onCancel: expectAsync0(() {
+        isCanceled = true;
+      }));
+      var subscription = controller.stream.transform(
+          subscriptionTransformer(handleCancel: expectAsync1((inner) {
+        callbackInvoked = true;
+        inner.cancel();
+      }))).listen(expectAsync1((_) {}, count: 0));
+
+      await flushMicrotasks();
+      expect(callbackInvoked, isFalse);
+      expect(isCanceled, isFalse);
+
+      subscription.cancel();
+      await flushMicrotasks();
+      expect(callbackInvoked, isTrue);
+      expect(isCanceled, isTrue);
+    });
+
+    test("invokes the callback once and caches its result", () async {
+      var completer = new Completer();
+      var controller = new StreamController();
+      var subscription = controller.stream
+          .transform(subscriptionTransformer(
+              handleCancel: expectAsync1((inner) => completer.future)))
+          .listen(expectAsync1((_) {}, count: 0));
+
+      var cancelFired1 = false;
+      subscription.cancel().then(expectAsync1((_) {
+        cancelFired1 = true;
+      }));
+
+      var cancelFired2 = false;
+      subscription.cancel().then(expectAsync1((_) {
+        cancelFired2 = true;
+      }));
+
+      await flushMicrotasks();
+      expect(cancelFired1, isFalse);
+      expect(cancelFired2, isFalse);
+
+      completer.complete();
+      await flushMicrotasks();
+      expect(cancelFired1, isTrue);
+      expect(cancelFired2, isTrue);
+    });
+  });
+
+  group("with a pause callback", () {
+    test("invokes the callback when pause is called", () async {
+      var pauseCount = 0;
+      var controller = new StreamController();
+      var subscription = controller.stream
+          .transform(subscriptionTransformer(
+              handlePause: expectAsync1((inner) {
+            pauseCount++;
+            inner.pause();
+          }, count: 3)))
+          .listen(expectAsync1((_) {}, count: 0));
+
+      await flushMicrotasks();
+      expect(pauseCount, equals(0));
+
+      subscription.pause();
+      await flushMicrotasks();
+      expect(pauseCount, equals(1));
+
+      subscription.pause();
+      await flushMicrotasks();
+      expect(pauseCount, equals(2));
+
+      subscription.resume();
+      subscription.resume();
+      await flushMicrotasks();
+      expect(pauseCount, equals(2));
+
+      subscription.pause();
+      await flushMicrotasks();
+      expect(pauseCount, equals(3));
+    });
+
+    test("doesn't invoke the callback when the subscription has been canceled",
+        () async {
+      var controller = new StreamController();
+      var subscription = controller.stream
+          .transform(subscriptionTransformer(
+              handlePause: expectAsync1((_) {}, count: 0)))
+          .listen(expectAsync1((_) {}, count: 0));
+
+      subscription.cancel();
+      subscription.pause();
+      subscription.pause();
+      subscription.pause();
+    });
+  });
+
+  group("with a resume callback", () {
+    test("invokes the callback when resume is called", () async {
+      var resumeCount = 0;
+      var controller = new StreamController();
+      var subscription = controller.stream
+          .transform(subscriptionTransformer(
+              handleResume: expectAsync1((inner) {
+            resumeCount++;
+            inner.resume();
+          }, count: 3)))
+          .listen(expectAsync1((_) {}, count: 0));
+
+      await flushMicrotasks();
+      expect(resumeCount, equals(0));
+
+      subscription.resume();
+      await flushMicrotasks();
+      expect(resumeCount, equals(1));
+
+      subscription.pause();
+      subscription.pause();
+      await flushMicrotasks();
+      expect(resumeCount, equals(1));
+
+      subscription.resume();
+      await flushMicrotasks();
+      expect(resumeCount, equals(2));
+
+      subscription.resume();
+      await flushMicrotasks();
+      expect(resumeCount, equals(3));
+    });
+
+    test("invokes the callback when a resume future completes", () async {
+      var resumed = false;
+      var controller = new StreamController();
+      var subscription = controller.stream.transform(
+          subscriptionTransformer(handleResume: expectAsync1((inner) {
+        resumed = true;
+        inner.resume();
+      }))).listen(expectAsync1((_) {}, count: 0));
+
+      var completer = new Completer();
+      subscription.pause(completer.future);
+      await flushMicrotasks();
+      expect(resumed, isFalse);
+
+      completer.complete();
+      await flushMicrotasks();
+      expect(resumed, isTrue);
+    });
+
+    test("doesn't invoke the callback when the subscription has been canceled",
+        () async {
+      var controller = new StreamController();
+      var subscription = controller.stream
+          .transform(subscriptionTransformer(
+              handlePause: expectAsync1((_) {}, count: 0)))
+          .listen(expectAsync1((_) {}, count: 0));
+
+      subscription.cancel();
+      subscription.resume();
+      subscription.resume();
+      subscription.resume();
+    });
+  });
+
+  group("when the outer subscription is canceled but the inner is not", () {
+    StreamSubscription subscription;
+    setUp(() {
+      var controller = new StreamController();
+      subscription = controller.stream
+          .transform(subscriptionTransformer(handleCancel: (_) {}))
+          .listen(expectAsync1((_) {}, count: 0),
+              onError: expectAsync2((_, __) {}, count: 0),
+              onDone: expectAsync0(() {}, count: 0));
+      subscription.cancel();
+      controller.add(1);
+      controller.addError("oh no!");
+      controller.close();
+    });
+
+    test("doesn't call a new onData", () async {
+      subscription.onData(expectAsync1((_) {}, count: 0));
+      await flushMicrotasks();
+    });
+
+    test("doesn't call a new onError", () async {
+      subscription.onError(expectAsync2((_, __) {}, count: 0));
+      await flushMicrotasks();
+    });
+
+    test("doesn't call a new onDone", () async {
+      subscription.onDone(expectAsync0(() {}, count: 0));
+      await flushMicrotasks();
+    });
+
+    test("isPaused returns false", () {
+      expect(subscription.isPaused, isFalse);
+    });
+
+    test("asFuture never completes", () async {
+      subscription.asFuture().then(expectAsync1((_) {}, count: 0));
+      await flushMicrotasks();
+    });
+  });
+}