reactive/Rx.NET/Source/tests/Tests.System.Reactive/Tests/Linq/Observable/TimeoutTest.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT License.
// See the LICENSE file in the project root for more information. 

using System;
using System.Linq;
using System.Reactive.Concurrency;
using System.Reactive.Linq;
using Microsoft.Reactive.Testing;
using Microsoft.VisualStudio.TestTools.UnitTesting;

using Assert = Xunit.Assert;

namespace ReactiveTests.Tests
{
    [TestClass]
    public class TimeoutTest : ReactiveTest
    {

        [TestMethod]
        public void Timeout_ArgumentChecking()
        {
            var scheduler = new TestScheduler();
            var someObservable = Observable.Empty<int>();

            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default(IObservable<int>), TimeSpan.Zero));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default, TimeSpan.Zero, someObservable));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, TimeSpan.Zero, default(IObservable<int>)));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default(IObservable<int>), new DateTimeOffset()));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default, new DateTimeOffset(), someObservable));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, new DateTimeOffset(), default(IObservable<int>)));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default(IObservable<int>), TimeSpan.Zero, scheduler));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, TimeSpan.Zero, default(IScheduler)));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default, TimeSpan.Zero, someObservable, scheduler));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, TimeSpan.Zero, someObservable, null));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, TimeSpan.Zero, default, scheduler));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default(IObservable<int>), new DateTimeOffset(), scheduler));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, new DateTimeOffset(), default(IScheduler)));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default, new DateTimeOffset(), someObservable, scheduler));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, new DateTimeOffset(), someObservable, null));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, new DateTimeOffset(), default, scheduler));

            ReactiveAssert.Throws<ArgumentOutOfRangeException>(() => Observable.Timeout(someObservable, TimeSpan.FromSeconds(-1)));
            ReactiveAssert.Throws<ArgumentOutOfRangeException>(() => Observable.Timeout(someObservable, TimeSpan.FromSeconds(-1), scheduler));
            ReactiveAssert.Throws<ArgumentOutOfRangeException>(() => Observable.Timeout(someObservable, TimeSpan.FromSeconds(-1), someObservable));
            ReactiveAssert.Throws<ArgumentOutOfRangeException>(() => Observable.Timeout(someObservable, TimeSpan.FromSeconds(-1), someObservable, scheduler));
        }

        [TestMethod]
        public void Timeout_InTime()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(150, 1),
                OnNext(210, 2),
                OnNext(230, 3),
                OnNext(260, 4),
                OnNext(300, 5),
                OnNext(350, 6),
                OnCompleted<int>(400)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(500), scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(210, 2),
                OnNext(230, 3),
                OnNext(260, 4),
                OnNext(300, 5),
                OnNext(350, 6),
                OnCompleted<int>(400)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );
        }

        [TestMethod]
        public void Timeout_DateTimeOffset_TimeoutOccurs_WithDefaultException()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(410, 1)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(new DateTimeOffset(new DateTime(400), TimeSpan.Zero), scheduler)
            );

            res.Messages.AssertEqual(
                OnError<int>(400, ex => ex is TimeoutException)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );
        }

        [TestMethod]
        public void Timeout_TimeSpan_TimeoutOccurs_WithDefaultException()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(410, 1)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(200), scheduler)
            );

            res.Messages.AssertEqual(
                OnError<int>(400, ex => ex is TimeoutException)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );
        }

        [TestMethod]
        public void Timeout_TimeSpan_DefaultScheduler()
        {
            Assert.True(Observable.Return(1).Timeout(TimeSpan.FromSeconds(10)).ToEnumerable().Single() == 1);
        }

        [TestMethod]
        public void Timeout_TimeSpan_Observable_DefaultScheduler()
        {
            Assert.True(Observable.Return(1).Timeout(TimeSpan.FromSeconds(10), Observable.Return(2)).ToEnumerable().Single() == 1);
        }

        [TestMethod]
        public void Timeout_DateTimeOffset_DefaultScheduler()
        {
            Assert.True(Observable.Return(1).Timeout(DateTimeOffset.UtcNow + TimeSpan.FromSeconds(10)).ToEnumerable().Single() == 1);
        }

        [TestMethod]
        public void Timeout_DateTimeOffset_Observable_DefaultScheduler()
        {
            Assert.True(Observable.Return(1).Timeout(DateTimeOffset.UtcNow + TimeSpan.FromSeconds(10), Observable.Return(2)).ToEnumerable().Single() == 1);
        }

        [TestMethod]
        public void Timeout_TimeoutOccurs_1()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(70, 1),
                OnNext(130, 2),
                OnNext(310, 3),
                OnNext(400, 4),
                OnCompleted<int>(500)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(50, -1),
                OnNext(200, -2),
                OnNext(310, -3),
                OnCompleted<int>(320)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(100), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(350, -1),
                OnNext(500, -2),
                OnNext(610, -3),
                OnCompleted<int>(620)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 300)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(300, 620)
            );
        }

        [TestMethod]
        public void Timeout_TimeoutOccurs_2()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(70, 1),
                OnNext(130, 2),
                OnNext(240, 3),
                OnNext(310, 4),
                OnNext(430, 5),
                OnCompleted<int>(500)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(50, -1),
                OnNext(200, -2),
                OnNext(310, -3),
                OnCompleted<int>(320)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(100), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(240, 3),
                OnNext(310, 4),
                OnNext(460, -1),
                OnNext(610, -2),
                OnNext(720, -3),
                OnCompleted<int>(730)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 410)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(410, 730)
            );
        }

        [TestMethod]
        public void Timeout_TimeoutOccurs_Never()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(70, 1),
                OnNext(130, 2),
                OnNext(240, 3),
                OnNext(310, 4),
                OnNext(430, 5),
                OnCompleted<int>(500)
            );

            var ys = scheduler.CreateColdObservable<int>(
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(100), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(240, 3),
                OnNext(310, 4)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 410)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(410, 1000)
            );
        }

        [TestMethod]
        public void Timeout_TimeoutOccurs_Completed()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnCompleted<int>(500)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(100, -1)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(100), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(400, -1)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 300)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(300, 1000)
            );
        }

        [TestMethod]
        public void Timeout_TimeoutOccurs_Error()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnError<int>(500, new Exception())
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(100, -1)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(100), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(400, -1)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 300)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(300, 1000)
            );
        }

        [TestMethod]
        public void Timeout_TimeoutOccurs_NextIsError()
        {
            var ex = new Exception();

            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(500, 42)
            );

            var ys = scheduler.CreateColdObservable(
                OnError<int>(100, ex)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(100), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnError<int>(400, ex)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 300)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(300, 400)
            );
        }

        [TestMethod]
        public void Timeout_TimeoutNotOccurs_Completed()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnCompleted<int>(250)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(100, -1)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(100), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnCompleted<int>(250)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 250)
            );

            ys.Subscriptions.AssertEqual(
            );
        }

        [TestMethod]
        public void Timeout_TimeoutNotOccurs_Error()
        {
            var scheduler = new TestScheduler();

            var ex = new Exception();

            var xs = scheduler.CreateHotObservable(
                OnError<int>(250, ex)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(100, -1)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(100), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnError<int>(250, ex)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 250)
            );

            ys.Subscriptions.AssertEqual(
            );
        }

        [TestMethod]
        public void Timeout_TimeoutDoesNotOccur()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(70, 1),
                OnNext(130, 2),
                OnNext(240, 3),
                OnNext(320, 4),
                OnNext(410, 5),
                OnCompleted<int>(500)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(50, -1),
                OnNext(200, -2),
                OnNext(310, -3),
                OnCompleted<int>(320)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(TimeSpan.FromTicks(100), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(240, 3),
                OnNext(320, 4),
                OnNext(410, 5),
                OnCompleted<int>(500)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 500)
            );

            ys.Subscriptions.AssertEqual(
            );
        }

        [TestMethod]
        public void Timeout_DateTimeOffset_TimeoutOccurs()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(410, 1)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(100, -1)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(new DateTimeOffset(new DateTime(400), TimeSpan.Zero), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(500, -1)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(400, 1000)
            );
        }

        [TestMethod]
        public void Timeout_DateTimeOffset_TimeoutDoesNotOccur_Completed()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnCompleted<int>(390)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(100, -1)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(new DateTimeOffset(new DateTime(400), TimeSpan.Zero), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnCompleted<int>(390)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 390)
            );

            ys.Subscriptions.AssertEqual(
            );
        }

        [TestMethod]
        public void Timeout_DateTimeOffset_TimeoutDoesNotOccur_Error()
        {
            var scheduler = new TestScheduler();

            var ex = new Exception();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnError<int>(390, ex)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(100, -1)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(new DateTimeOffset(new DateTime(400), TimeSpan.Zero), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnError<int>(390, ex)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 390)
            );

            ys.Subscriptions.AssertEqual(
            );
        }

        [TestMethod]
        public void Timeout_DateTimeOffset_TimeoutOccur_2()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(100, -1)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(new DateTimeOffset(new DateTime(400), TimeSpan.Zero), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(500, -1)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(400, 1000)
            );
        }

        [TestMethod]
        public void Timeout_DateTimeOffset_TimeoutOccur_3()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable<int>(
            );

            var res = scheduler.Start(() =>
                xs.Timeout(new DateTimeOffset(new DateTime(400), TimeSpan.Zero), ys, scheduler)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(400, 1000)
            );
        }

        [TestMethod]
        public void Timeout_Duration_ArgumentChecking()
        {
            var someObservable = Observable.Empty<int>();

            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default, someObservable, x => someObservable, someObservable));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, default, x => someObservable, someObservable));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, someObservable, default, someObservable));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, someObservable, x => someObservable, default));

            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default(IObservable<int>), someObservable, x => someObservable));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, default, x => someObservable));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, someObservable, default));

            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default, x => someObservable, someObservable));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, default(Func<int, IObservable<int>>), someObservable));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, x => someObservable, default));

            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(default(IObservable<int>), x => someObservable));
            ReactiveAssert.Throws<ArgumentNullException>(() => Observable.Timeout(someObservable, default(Func<int, IObservable<int>>)));
        }

        [TestMethod]
        public void Timeout_Duration_Simple_Never()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable<int>(
            );

            var res = scheduler.Start(() =>
                xs.Timeout(ys, _ => ys)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 450)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(200, 310),
                Subscribe(310, 350),
                Subscribe(350, 420),
                Subscribe(420, 450)
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_TimeoutFirst()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(100, "Boo!")
            );

            var zs = scheduler.CreateColdObservable<string>(
            );

            var res = scheduler.Start(() =>
                xs.Timeout(ys, _ => zs)
            );

            res.Messages.AssertEqual(
                OnError<int>(300, ex => ex is TimeoutException)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 300)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(200, 300)
            );

            zs.Subscriptions.AssertEqual(
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_TimeoutFirst_Other()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable(
                OnNext(100, "Boo!")
            );

            var zs = scheduler.CreateColdObservable<string>(
            );

            var ts = scheduler.CreateColdObservable(
                OnNext(50, 42),
                OnCompleted<int>(70)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(ys, _ => zs, ts)
            );

            res.Messages.AssertEqual(
                OnNext(350, 42),
                OnCompleted<int>(370)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 300)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(200, 300)
            );

            zs.Subscriptions.AssertEqual(
            );

            ts.Subscriptions.AssertEqual(
                Subscribe(300, 370)
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_TimeoutLater()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable<string>(
            );

            var zs = scheduler.CreateColdObservable(
                OnNext(50, "Boo!")
            );

            var res = scheduler.Start(() =>
                xs.Timeout(ys, _ => zs)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2),
                OnError<int>(400, ex => ex is TimeoutException)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(200, 310)
            );

            zs.Subscriptions.AssertEqual(
                Subscribe(310, 350),
                Subscribe(350, 400)
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_TimeoutLater_Other()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable<string>(
            );

            var zs = scheduler.CreateColdObservable(
                OnNext(50, "Boo!")
            );

            var ts = scheduler.CreateColdObservable(
                OnNext(50, 42),
                OnCompleted<int>(70)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(ys, _ => zs, ts)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(450, 42),
                OnCompleted<int>(470)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(200, 310)
            );

            zs.Subscriptions.AssertEqual(
                Subscribe(310, 350),
                Subscribe(350, 400)
            );

            ts.Subscriptions.AssertEqual(
                Subscribe(400, 470)
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_TimeoutLater_NoFirst()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var zs = scheduler.CreateColdObservable(
                OnNext(50, "Boo!")
            );

            var res = scheduler.Start(() =>
                xs.Timeout(_ => zs)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2),
                OnError<int>(400, ex => ex is TimeoutException)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );

            zs.Subscriptions.AssertEqual(
                Subscribe(310, 350),
                Subscribe(350, 400)
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_TimeoutLater_Other_NoFirst()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var zs = scheduler.CreateColdObservable(
                OnNext(50, "Boo!")
            );

            var ts = scheduler.CreateColdObservable(
                OnNext(50, 42),
                OnCompleted<int>(70)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(_ => zs, ts)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(450, 42),
                OnCompleted<int>(470)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );

            zs.Subscriptions.AssertEqual(
                Subscribe(310, 350),
                Subscribe(350, 400)
            );

            ts.Subscriptions.AssertEqual(
                Subscribe(400, 470)
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_TimeoutByCompletion()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable<string>(
            );

            var zs = scheduler.CreateColdObservable(
                OnCompleted<string>(50)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(ys, _ => zs)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2),
                OnError<int>(400, ex => ex is TimeoutException)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(200, 310)
            );

            zs.Subscriptions.AssertEqual(
                Subscribe(310, 350),
                Subscribe(350, 400)
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_SelectorThrows()
        {
            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable<string>(
            );

            var zs = scheduler.CreateColdObservable<string>(
            );

            var ex = new Exception();

            var res = scheduler.Start(() =>
                xs.Timeout(ys, x =>
                {
                    if (x < 3)
                    {
                        return zs;
                    }
                    else
                    {
                        throw ex;
                    }
                })
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnError<int>(420, ex)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 420)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(200, 310)
            );

            zs.Subscriptions.AssertEqual(
                Subscribe(310, 350),
                Subscribe(350, 420)
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_InnerThrows()
        {
            var ex = new Exception();

            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable<string>(
            );

            var zs = scheduler.CreateColdObservable(
                OnError<string>(50, ex)
            );

            var res = scheduler.Start(() =>
                xs.Timeout(ys, x => zs)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2),
                OnError<int>(400, ex)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 400)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(200, 310)
            );

            zs.Subscriptions.AssertEqual(
                Subscribe(310, 350),
                Subscribe(350, 400)
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_FirstThrows()
        {
            var ex = new Exception();

            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnCompleted<int>(450)
            );

            var ys = scheduler.CreateColdObservable(
                OnError<string>(50, ex)
            );

            var zs = scheduler.CreateColdObservable<string>(
            );

            var res = scheduler.Start(() =>
                xs.Timeout(ys, x => zs)
            );

            res.Messages.AssertEqual(
                OnError<int>(250, ex)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 250)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(200, 250)
            );

            zs.Subscriptions.AssertEqual(
            );
        }

        [TestMethod]
        public void Timeout_Duration_Simple_SourceThrows()
        {
            var ex = new Exception();

            var scheduler = new TestScheduler();

            var xs = scheduler.CreateHotObservable(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnError<int>(450, ex)
            );

            var ys = scheduler.CreateColdObservable<string>(
            );

            var zs = scheduler.CreateColdObservable<string>(
            );

            var res = scheduler.Start(() =>
                xs.Timeout(ys, x => zs)
            );

            res.Messages.AssertEqual(
                OnNext(310, 1),
                OnNext(350, 2),
                OnNext(420, 3),
                OnError<int>(450, ex)
            );

            xs.Subscriptions.AssertEqual(
                Subscribe(200, 450)
            );

            ys.Subscriptions.AssertEqual(
                Subscribe(200, 310)
            );

            zs.Subscriptions.AssertEqual(
                Subscribe(310, 350),
                Subscribe(350, 420),
                Subscribe(420, 450)
            );
        }

    }
}