blob: a644be399257568016d80637bf08506ec4f2a5f3 [file] [log] [blame]
// Copyright (c) 2011, 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.
// @dart = 2.9
// Test the basic StreamController and StreamController.singleSubscription.
library stream_controller_test;
import "package:expect/expect.dart";
import "package:async_helper/async_helper.dart";
import 'dart:async';
import 'event_helper.dart';
const MS = const Duration(milliseconds: 1);
fail(e) {
Expect.fail("Unexepected error: $e");
}
void testMultiController() {
// Test normal flow.
{
var c = new StreamController(sync: true);
Events expectedEvents = new Events()
..add(42)
..add("dibs")
..error("error!")
..error("error too!")
..close();
CaptureEvents actualEvents =
new Events.capture(c.stream.asBroadcastStream());
expectedEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test automatic unsubscription on error.
{
var c = new StreamController(sync: true);
var expectedEvents = new Events()
..add(42)
..error("error");
var actualEvents =
new Events.capture(c.stream.asBroadcastStream(), cancelOnError: true);
Events sentEvents = new Events()
..add(42)
..error("error")
..add("Are you there?");
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test manual unsubscription.
{
var c = new StreamController(sync: true);
var expectedEvents = new Events()
..add(42)
..error("error")
..add(37);
dynamic actualEvents =
new Events.capture(c.stream.asBroadcastStream(), cancelOnError: false);
expectedEvents.replay(c);
actualEvents.subscription.cancel();
c.add("Are you there"); // Not sent to actualEvents.
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test filter.
{
var c = new StreamController(sync: true);
var expectedEvents = new Events()
..add("a string")
..add("another string")
..close();
var sentEvents = new Events()
..add("a string")
..add(42)
..add("another string")
..close();
var actualEvents = new Events.capture(
c.stream.asBroadcastStream().where((v) => v is String));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test map.
{
var c = new StreamController(sync: true);
var expectedEvents = new Events()
..add("abab")
..error("error")
..close();
var sentEvents = new Events()
..add("ab")
..error("error")
..close();
var actualEvents =
new Events.capture(c.stream.asBroadcastStream().map((v) => "$v$v"));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test handleError.
{
var c = new StreamController(sync: true);
var expectedEvents = new Events()
..add("ab")
..error("[foo]");
var sentEvents = new Events()
..add("ab")
..error("foo")
..add("ab")
..close();
var actualEvents = new Events.capture(
c.stream.asBroadcastStream().handleError((error) {
if (error is String) {
// TODO(floitsch): this test originally changed the stacktrace.
throw "[${error}]";
}
}),
cancelOnError: true);
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// reduce is tested asynchronously and therefore not in this file.
// Test expand
{
var c = new StreamController(sync: true);
var sentEvents = new Events()
..add(3)
..add(2)
..add(4)
..close();
var expectedEvents = new Events()
..add(1)
..add(2)
..add(3)
..add(1)
..add(2)
..add(1)
..add(2)
..add(3)
..add(4)
..close();
var actualEvents =
new Events.capture(c.stream.asBroadcastStream().expand((v) {
var l = [];
for (int i = 0; i < v; i++) l.add(i + 1);
return l;
}));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test transform.
{
var c = new StreamController(sync: true);
var sentEvents = new Events()
..add("a")
..error(42)
..add("b")
..close();
var expectedEvents = new Events()
..error("a")
..add(42)
..error("b")
..add("foo")
..close();
var actualEvents = new Events.capture(c.stream
.asBroadcastStream()
.transform(new StreamTransformer.fromHandlers(handleData: (v, s) {
s.addError(v);
}, handleError: (e, st, s) {
s.add(e);
}, handleDone: (s) {
s.add("foo");
s.close();
})));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test multiple filters.
{
var c = new StreamController(sync: true);
var sentEvents = new Events()
..add(42)
..add("snugglefluffy")
..add(7)
..add("42")
..error("not FormatException") // Unsubscribes.
..close();
var expectedEvents = new Events()
..add(42)
..error("not FormatException");
var actualEvents = new Events.capture(
c.stream
.asBroadcastStream()
.where((v) => v is String)
.map((v) => int.parse(v))
.handleError((error) {
if (error is! FormatException) throw error;
}).where((v) => v > 10),
cancelOnError: true);
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test subscription changes while firing.
{
var c = new StreamController(sync: true);
var sink = c.sink;
var stream = c.stream.asBroadcastStream();
var counter = 0;
var subscription = stream.listen(null);
subscription.onData((data) {
counter += data;
subscription.cancel();
stream.listen((data) {
counter += 10 * data;
});
var subscription2 = stream.listen(null);
subscription2.onData((data) {
counter += 100 * data;
if (data == 4) subscription2.cancel();
});
});
sink.add(1); // seen by stream 1
sink.add(2); // seen by stream 10 and 100
sink.add(3); // -"-
sink.add(4); // -"-
sink.add(5); // seen by stream 10
Expect.equals(1 + 20 + 200 + 30 + 300 + 40 + 400 + 50, counter);
}
}
testSingleController() {
// Test normal flow.
{
var c = new StreamController(sync: true);
Events expectedEvents = new Events()
..add(42)
..add("dibs")
..error("error!")
..error("error too!")
..close();
CaptureEvents actualEvents = new Events.capture(c.stream);
expectedEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test automatic unsubscription on error.
{
var c = new StreamController(sync: true);
var expectedEvents = new Events()
..add(42)
..error("error");
var actualEvents = new Events.capture(c.stream, cancelOnError: true);
Events sentEvents = new Events()
..add(42)
..error("error")
..add("Are you there?");
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test manual unsubscription.
{
var c = new StreamController(sync: true);
var expectedEvents = new Events()
..add(42)
..error("error")
..add(37);
dynamic actualEvents = new Events.capture(c.stream, cancelOnError: false);
expectedEvents.replay(c);
actualEvents.subscription.cancel();
c.add("Are you there"); // Not sent to actualEvents.
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test filter.
{
var c = new StreamController(sync: true);
var expectedEvents = new Events()
..add("a string")
..add("another string")
..close();
var sentEvents = new Events()
..add("a string")
..add(42)
..add("another string")
..close();
var actualEvents = new Events.capture(c.stream.where((v) => v is String));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test map.
{
var c = new StreamController(sync: true);
var expectedEvents = new Events()
..add("abab")
..error("error")
..close();
var sentEvents = new Events()
..add("ab")
..error("error")
..close();
var actualEvents = new Events.capture(c.stream.map((v) => "$v$v"));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test handleError.
{
var c = new StreamController(sync: true);
var expectedEvents = new Events()
..add("ab")
..error("[foo]");
var sentEvents = new Events()
..add("ab")
..error("foo")
..add("ab")
..close();
var actualEvents = new Events.capture(c.stream.handleError((error) {
if (error is String) {
// TODO(floitsch): this error originally changed the stack trace.
throw "[${error}]";
}
}), cancelOnError: true);
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// reduce is tested asynchronously and therefore not in this file.
// Test expand
{
var c = new StreamController(sync: true);
var sentEvents = new Events()
..add(3)
..add(2)
..add(4)
..close();
var expectedEvents = new Events()
..add(1)
..add(2)
..add(3)
..add(1)
..add(2)
..add(1)
..add(2)
..add(3)
..add(4)
..close();
var actualEvents = new Events.capture(c.stream.expand((v) {
var l = [];
for (int i = 0; i < v; i++) l.add(i + 1);
return l;
}));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// test contains.
{
var c = new StreamController(sync: true);
// Error after match is not important.
var sentEvents = new Events()
..add("a")
..add("x")
..error("FAIL")
..close();
Future<bool> contains = c.stream.contains("x");
contains.then((var c) {
Expect.isTrue(c);
});
sentEvents.replay(c);
}
{
var c = new StreamController(sync: true);
// Not matching is ok.
var sentEvents = new Events()
..add("a")
..add("x")
..add("b")
..close();
Future<bool> contains = c.stream.contains("y");
contains.then((var c) {
Expect.isFalse(c);
});
sentEvents.replay(c);
}
{
var c = new StreamController(sync: true);
// Error before match makes future err.
var sentEvents = new Events()
..add("a")
..error("FAIL")
..add("b")
..close();
Future<bool> contains = c.stream.contains("b");
contains.then((var c) {
Expect.fail("no value expected");
}).catchError((error) {
Expect.equals("FAIL", error);
});
sentEvents.replay(c);
}
// Test transform.
{
var c = new StreamController(sync: true);
var sentEvents = new Events()
..add("a")
..error(42)
..add("b")
..close();
var expectedEvents = new Events()
..error("a")
..add(42)
..error("b")
..add("foo")
..close();
var actualEvents = new Events.capture(c.stream
.transform(new StreamTransformer.fromHandlers(handleData: (v, s) {
s.addError(v);
}, handleError: (e, st, s) {
s.add(e);
}, handleDone: (s) {
s.add("foo");
s.close();
})));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test multiple filters.
{
var c = new StreamController(sync: true);
var sentEvents = new Events()
..add(42)
..add("snugglefluffy")
..add(7)
..add("42")
..error("not FormatException") // Unsubscribes.
..close();
var expectedEvents = new Events()
..add(42)
..error("not FormatException");
var actualEvents = new Events.capture(
c.stream
.where((v) => v is String)
.map((v) => int.parse(v))
.handleError((error) {
if (error is! FormatException) throw error;
}).where((v) => v > 10),
cancelOnError: true);
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
// Test that only one subscription is allowed.
{
var c = new StreamController(sync: true);
var sink = c.sink;
var stream = c.stream;
var counter = 0;
var subscription = stream.listen((data) {
counter += data;
});
Expect.throwsStateError(() => stream.listen(null));
sink.add(1);
Expect.equals(1, counter);
c.close();
}
}
testExtraMethods() {
Events sentEvents = new Events()
..add(1)
..add(2)
..add(3)
..close();
var c = new StreamController(sync: true);
Events expectedEvents = new Events()
..add(3)
..close();
Events actualEvents = new Events.capture(c.stream.skip(2));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
c = new StreamController(sync: true);
expectedEvents = new Events()..close();
actualEvents = new Events.capture(c.stream.skip(3));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
c = new StreamController(sync: true);
expectedEvents = new Events()..close();
actualEvents = new Events.capture(c.stream.skip(7));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
c = new StreamController(sync: true);
expectedEvents = sentEvents;
actualEvents = new Events.capture(c.stream.skip(0));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
c = new StreamController(sync: true);
expectedEvents = new Events()
..add(3)
..close();
actualEvents = new Events.capture(c.stream.skipWhile((x) => x <= 2));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
c = new StreamController(sync: true);
expectedEvents = new Events()
..add(2)
..add(3)
..close();
actualEvents = new Events.capture(c.stream.skipWhile((x) => x <= 1));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
c = new StreamController(sync: true);
expectedEvents = new Events()
..add(1)
..add(2)
..add(3)
..close();
actualEvents = new Events.capture(c.stream.skipWhile((x) => false));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
c = new StreamController(sync: true);
expectedEvents = new Events()
..add(1)
..add(2)
..close();
actualEvents = new Events.capture(c.stream.take(2));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
c = new StreamController(sync: true);
expectedEvents = new Events()
..add(1)
..add(2)
..close();
actualEvents = new Events.capture(c.stream.takeWhile((x) => x <= 2));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
c = new StreamController(sync: true);
sentEvents = new Events()
..add(1)
..add(1)
..add(2)
..add(1)
..add(2)
..add(2)
..add(2)
..close();
expectedEvents = new Events()
..add(1)
..add(2)
..add(1)
..add(2)
..close();
actualEvents = new Events.capture(c.stream.distinct());
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
c = new StreamController(sync: true);
sentEvents = new Events()
..add(5)
..add(6)
..add(4)
..add(6)
..add(8)
..add(3)
..add(4)
..add(1)
..close();
expectedEvents = new Events()
..add(5)
..add(4)
..add(3)
..add(1)
..close();
// Use 'distinct' as a filter with access to the previously emitted event.
actualEvents = new Events.capture(c.stream.distinct((a, b) => a < b));
sentEvents.replay(c);
Expect.listEquals(expectedEvents.events, actualEvents.events);
}
void testClosed() {
StreamController c = new StreamController(sync: true);
Expect.isFalse(c.isClosed);
c.add(42);
Expect.isFalse(c.isClosed);
c.addError("bad");
Expect.isFalse(c.isClosed);
c.close();
Expect.isTrue(c.isClosed);
}
void testCloseFuture() {
asyncStart();
asyncStart();
var c = new StreamController();
var f = c.close();
Expect.isTrue(c.isClosed);
bool doneSeen = false;
f.then((_) {
Expect.isTrue(doneSeen);
asyncEnd();
});
// Only listen after a while.
new Timer(MS * 250, () {
c.stream.listen(null, onDone: () {
asyncEnd();
doneSeen = true;
});
});
}
void testCloseFuture2() {
asyncStart();
asyncStart();
var c = new StreamController.broadcast();
var f = c.close();
Expect.isTrue(c.isClosed);
bool doneSeen = false;
f.then((_) {
// Done future on broadcast stream can happen
// before a listener is added.
Expect.isFalse(doneSeen);
asyncEnd();
});
// Only listen after a while.
new Timer(MS * 250, () {
c.stream.listen(null, onDone: () {
doneSeen = true;
asyncEnd();
});
});
}
void testCloseFuture3() {
asyncStart();
var c = new StreamController.broadcast();
c..add(1)..add(2)..add(3)..add(4);
c.stream.listen(null).cancel();
var f = c.close();
Expect.isTrue(c.isClosed);
f.then((_) {
asyncEnd();
});
}
void testStreamEquals() {
StreamController c;
c = new StreamController(sync: false);
Expect.equals(c.stream, c.stream);
c = new StreamController(sync: true);
Expect.equals(c.stream, c.stream);
c = new StreamController(sync: false, onListen: () {});
Expect.equals(c.stream, c.stream);
c = new StreamController(sync: true, onListen: () {});
Expect.equals(c.stream, c.stream);
c = new StreamController.broadcast(sync: false);
Expect.equals(c.stream, c.stream);
c = new StreamController.broadcast(sync: true);
Expect.equals(c.stream, c.stream);
c = new StreamController.broadcast(sync: false, onListen: () {});
Expect.equals(c.stream, c.stream);
c = new StreamController.broadcast(sync: true, onListen: () {});
Expect.equals(c.stream, c.stream);
}
void testCancelThrow() {
asyncStart();
asyncStart();
asyncStart();
StreamController c = new StreamController(onCancel: () {
asyncEnd();
throw "ERROR";
});
c.add(1);
c.add(2);
c.add(3);
Future done = c.close();
StreamSubscription sub;
sub = c.stream.listen((v) {
Expect.equals(1, v);
Future f = sub.cancel();
f.catchError((e) {
// Must complete with error from onCancel.
Expect.equals("ERROR", e);
asyncEnd();
});
});
done.catchError(fail).whenComplete(asyncEnd); // Must complete without error.
}
void testCancelThrow2() {
asyncStart();
asyncStart();
asyncStart();
asyncStart();
asyncStart();
StreamController c2 = new StreamController(onCancel: () {
asyncEnd();
throw "ERROR";
});
c2.add(1);
c2.add(2);
Future done2 = c2.close();
done2.catchError(fail).whenComplete(asyncEnd); // Should not get error;
StreamController c = new StreamController();
var sub;
sub = c.stream.listen((v) {
Expect.equals(1, v);
Future f = sub.cancel();
f.catchError((e) {
// Error from addStream stream's cancel must go only here.
asyncEnd();
Expect.equals("ERROR", e);
});
});
var addDone = c.addStream(c2.stream);
addDone.catchError(fail).whenComplete(asyncEnd); // Should not get error.
var done = c.done;
done.catchError(fail).whenComplete(asyncEnd); // Should not get error.
}
void testCancelThrow3() {
asyncStart();
asyncStart();
asyncStart();
asyncStart();
asyncStart();
asyncStart();
StreamController c2 = new StreamController(onCancel: () {
asyncEnd();
throw "ERROR2";
});
c2.add(1);
c2.add(2);
var done2 = c2.close();
done2.catchError(fail).whenComplete(asyncEnd); // Should not get error;
StreamController c = new StreamController(onCancel: () {
asyncEnd();
throw "ERROR1";
});
var sub;
sub = c.stream.listen((v) {
Expect.equals(1, v);
Future f = sub.cancel();
f.catchError((e) {
// Only the last error ends up here.
Expect.equals("ERROR1", e);
asyncEnd();
});
});
var addDone = c.addStream(c2.stream);
addDone.catchError(fail).whenComplete(asyncEnd); // Error must not go here.
c.done.catchError(fail).whenComplete(asyncEnd); // Error must not go here.
}
void testBroadcastListenAfterClose() {
asyncStart();
StreamController c = new StreamController.broadcast();
var f = c.close();
f.then((_) {
// Listening after close is allowed. The listener gets a done event.
c.stream.listen(null, onDone: asyncEnd);
});
}
void testBroadcastListenAfterClosePaused() {
asyncStart();
StreamController c = new StreamController.broadcast();
var f = c.close();
f.then((_) {
// Listening after close is allowed. The listener gets a done event.
var sub = c.stream.listen(null, onDone: () {
Expect.fail("wrong done");
});
sub.pause();
sub.pause();
new Timer(MS * 100, () {
sub.asFuture().whenComplete(() {
Expect.fail("Bad complete");
});
sub.resume();
new Timer(MS * 100, () {
sub.onDone(asyncEnd);
sub.resume();
});
});
});
}
void testAsBroadcastListenAfterClose() {
asyncStart();
asyncStart();
StreamController c = new StreamController();
Stream s = c.stream.asBroadcastStream();
s.listen(null, onDone: asyncEnd);
var f = c.close();
f.then((_) {
// Listening after close is allowed. The listener gets a done event.
s.listen(null, onDone: asyncEnd);
});
}
void testAsBroadcastListenAfterClosePaused() {
asyncStart();
asyncStart();
StreamController c = new StreamController();
Stream s = c.stream.asBroadcastStream();
s.listen(null, onDone: asyncEnd);
var f = c.close();
f.then((_) {
// Listening after close is allowed. The listener gets a done event.
var sub = s.listen(null, onDone: () {
Expect.fail("wrong done");
});
sub.pause();
sub.pause();
new Timer(MS * 100, () {
sub.asFuture().whenComplete(() {
Expect.fail("Bad complete");
});
sub.resume();
new Timer(MS * 100, () {
sub.onDone(asyncEnd);
sub.resume();
});
});
});
}
void testEventInListen() {
asyncStart();
// Regression test for http://dartbug.com/19722
var c;
void send() {
c.add(1);
}
int i = 1;
c = new StreamController.broadcast(onListen: send, sync: true);
c.stream.listen((v) {
Expect.equals(i++, v);
}, onDone: asyncEnd);
c.add(2);
c.close();
}
void testSyncControllerNotReentrant() {
Stream emptyStream = (new StreamController.broadcast()..close()).stream;
asyncStart();
for (int listenerCount = 1; listenerCount <= 2; listenerCount++) {
StreamController c = new StreamController.broadcast(sync: true);
for (int i = 0; i < listenerCount; i++) {
asyncStart();
asyncStart();
c.stream.listen((v) {
Expect.equals(42, v);
Expect.throws(() {
c.add(37);
});
Expect.throws(() {
c.addError(37);
});
Expect.throws(() {
c.addStream(emptyStream);
});
Expect.throws(() {
c.close();
});
asyncEnd();
}, onError: (e, s) {
Expect.equals(87, e);
Expect.throws(() {
c.add(37);
});
Expect.throws(() {
c.addError(37);
});
Expect.throws(() {
c.addStream(emptyStream);
});
Expect.throws(() {
c.close();
});
asyncEnd();
});
}
c.add(42);
c.addError(87);
}
asyncEnd();
}
void testSettingCallbacks() {
const int initial = 0;
const int running = 1;
const int paused = 2;
const int canceled = 3;
var controller = new StreamController();
var stream = controller.stream;
var state = initial;
var onListen = () {
state = running;
};
var onPause = () {
state = paused;
};
var onResume = () {
state = running;
};
var onCancel = () {
state = canceled;
};
Expect.isNull(controller.onListen);
Expect.isNull(controller.onPause);
Expect.isNull(controller.onResume);
Expect.isNull(controller.onCancel);
controller
..onListen = onListen
..onPause = onPause
..onResume = onResume
..onCancel = onCancel;
Expect.equals(onListen, controller.onListen);
Expect.equals(onPause, controller.onPause);
Expect.equals(onResume, controller.onResume);
Expect.equals(onCancel, controller.onCancel);
Expect.equals(initial, state);
var sub = stream.listen(null);
Expect.equals(running, state);
sub.pause();
Expect.equals(paused, state);
Expect.isTrue(controller.isPaused);
sub.resume();
Expect.equals(running, state);
Expect.isFalse(controller.isPaused);
var onListen2 = () {
state = -running;
};
var onPause2 = () {
state = -paused;
};
var onResume2 = () {
state = -running;
};
var onCancel2 = () {
state = -canceled;
};
// Changing them later does make a difference.
controller
..onListen = onListen2
..onPause = onPause2
..onResume = onResume2
..onCancel = onCancel2;
Expect.equals(onListen2, controller.onListen);
Expect.equals(onPause2, controller.onPause);
Expect.equals(onResume2, controller.onResume);
Expect.equals(onCancel2, controller.onCancel);
Expect.equals(running, state);
sub.pause();
Expect.equals(-paused, state);
Expect.isTrue(controller.isPaused);
sub.resume();
Expect.equals(-running, state);
Expect.isFalse(controller.isPaused);
sub.cancel();
Expect.equals(-canceled, state);
}
void testSettingNullCallbacks() {
failCallback() => fail("Callback should not be called");
var controller = new StreamController(
onListen: failCallback,
onPause: failCallback,
onResume: failCallback,
onCancel: failCallback);
var stream = controller.stream;
Expect.isFalse(controller.hasListener);
Expect.isTrue(controller.isPaused);
Expect.isNotNull(controller.onListen);
controller.onListen = null;
Expect.isNull(controller.onListen);
var sub = stream.listen(null);
Expect.isTrue(controller.hasListener);
Expect.isFalse(controller.isPaused);
Expect.isNotNull(controller.onPause);
controller.onPause = null;
Expect.isNull(controller.onPause);
sub.pause();
Expect.isTrue(controller.hasListener);
Expect.isTrue(controller.isPaused);
Expect.isNotNull(controller.onResume);
controller.onResume = null;
Expect.isNull(controller.onResume);
sub.resume();
Expect.isTrue(controller.hasListener);
Expect.isFalse(controller.isPaused);
Expect.isNotNull(controller.onCancel);
controller.onCancel = null;
Expect.isNull(controller.onCancel);
sub.cancel();
Expect.isFalse(controller.hasListener);
Expect.isFalse(controller.isPaused);
}
void testBroadcastSettingCallbacks() {
const int initial = 0;
const int running = 1;
const int canceled = 2;
var controller = new StreamController.broadcast();
var stream = controller.stream;
var state = initial;
Expect.throwsUnsupportedError(() => controller.onPause = () {});
Expect.throwsUnsupportedError(() => controller.onResume = () {});
controller
..onListen = () {
state = running;
}
..onCancel = () {
state = canceled;
};
Expect.equals(initial, state);
var sub = stream.listen(null);
Expect.equals(running, state);
sub.cancel();
Expect.equals(canceled, state);
// Changing them later does make a difference.
controller
..onListen = () {
state = -running;
}
..onCancel = () {
state = -canceled;
};
var sub2 = stream.listen(null);
Expect.equals(-running, state);
sub2.cancel();
Expect.equals(-canceled, state);
}
void testBroadcastSettingNullCallbacks() {
failCallback() => fail("Callback should not be called");
var controller = new StreamController.broadcast(
onListen: failCallback, onCancel: failCallback);
var stream = controller.stream;
Expect.isFalse(controller.hasListener);
controller.onListen = null;
var sub = stream.listen(null);
Expect.isTrue(controller.hasListener);
controller.onCancel = null;
sub.cancel();
Expect.isFalse(controller.hasListener);
}
main() {
asyncStart();
testMultiController();
testSingleController();
testExtraMethods();
testClosed();
testCloseFuture();
testCloseFuture2();
testCloseFuture3();
testStreamEquals();
testCancelThrow();
testCancelThrow2();
testCancelThrow3();
testBroadcastListenAfterClose();
testBroadcastListenAfterClosePaused();
testAsBroadcastListenAfterClose();
testAsBroadcastListenAfterClosePaused();
testEventInListen();
testSyncControllerNotReentrant();
testSettingCallbacks();
testSettingNullCallbacks();
testBroadcastSettingCallbacks();
testBroadcastSettingNullCallbacks();
asyncEnd();
}