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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System;
using System.Reactive;
using System.Reactive.Concurrency;
using System.Reactive.Linq;
using System.Threading;
using Microsoft.Reactive.Testing;
#if NUNIT
using NUnit.Framework;
using TestClassAttribute = NUnit.Framework.TestFixtureAttribute;
using TestMethodAttribute = NUnit.Framework.TestAttribute;
using TestInitializeAttribute = NUnit.Framework.SetUpAttribute;
#else
using Microsoft.VisualStudio.TestTools.UnitTesting;
#endif
namespace ReactiveTests.Tests
{
[TestClass]
public partial class ObservableSafetyTest : ReactiveTest
{
[TestMethod]
public void SubscribeSafe_ArgumentChecking()
{
ReactiveAssert.Throws<ArgumentNullException>(() => ObservableExtensions.SubscribeSafe<int>(default(IObservable<int>), Observer.Create<int>(_ => { })));
ReactiveAssert.Throws<ArgumentNullException>(() => ObservableExtensions.SubscribeSafe<int>(Observable.Return(42), default(IObserver<int>)));
}
[TestMethod]
public void Safety_Subscription1()
{
var ex = new Exception();
var xs = new RogueObservable(ex);
var res = xs.Where(x => true).Select(x => x);
var err = default(Exception);
var d = res.Subscribe(x => { Assert.Fail(); }, ex_ => { err = ex_; }, () => { Assert.Fail(); });
Assert.AreSame(ex, err);
d.Dispose();
}
[TestMethod]
public void Safety_Subscription2()
{
var ex = new Exception();
var scheduler = new TestScheduler();
var xs = scheduler.CreateHotObservable<int>(
OnNext(210, 42),
OnNext(220, 43),
OnNext(230, 44),
OnNext(240, 45),
OnCompleted<int>(250)
);
var ys = new RogueObservable(ex);
var res = scheduler.Start(() =>
xs.Merge(ys)
);
res.Messages.AssertEqual(
OnError<int>(200, ex)
);
xs.Subscriptions.AssertEqual(
Subscribe(200, 200)
);
}
class RogueObservable : IObservable<int>
{
private readonly Exception _ex;
public RogueObservable(Exception ex)
{
_ex = ex;
}
public IDisposable Subscribe(IObserver<int> observer)
{
throw _ex;
}
}
[TestMethod]
public void ObservableBase_ObserverThrows()
{
var ex = new Exception();
var failed = new ManualResetEvent(false);
var disposed = new ManualResetEvent(false);
var err = default(Exception);
var xs = Observable.Create<int>(observer =>
{
Scheduler.Default.Schedule(() =>
{
try
{
observer.OnNext(42);
}
catch (Exception ex_)
{
err = ex_;
failed.Set();
}
});
return () => { disposed.Set(); };
});
xs.Subscribe(x =>
{
throw ex;
});
// Can't use WaitAll - we're on an STA thread.
disposed.WaitOne();
failed.WaitOne();
Assert.AreSame(ex, err);
}
[TestMethod]
public void ObservableBase_ObserverThrows_CustomObserver()
{
var ex = new Exception();
var failed = new ManualResetEvent(false);
var disposed = new ManualResetEvent(false);
var err = default(Exception);
var xs = Observable.Create<int>(observer =>
{
Scheduler.Default.Schedule(() =>
{
try
{
observer.OnNext(42);
}
catch (Exception ex_)
{
err = ex_;
failed.Set();
}
});
return () => { disposed.Set(); };
});
xs.Subscribe(new MyObserver(_ => true, ex));
// Can't use WaitAll - we're on an STA thread.
disposed.WaitOne();
failed.WaitOne();
Assert.AreSame(ex, err);
}
[TestMethod]
public void Producer_ObserverThrows()
{
var ex = new Exception();
var scheduler = new TestScheduler();
var xs = scheduler.CreateHotObservable<int>(
OnNext(210, 1),
OnNext(220, 2),
OnNext(230, 3)
);
var ys = scheduler.CreateHotObservable<int>(
OnNext(215, 1),
OnNext(225, 2),
OnNext(235, 3)
);
var res = xs.CombineLatest(ys, (x, y) => x + y); // This creates a Producer object
scheduler.ScheduleAbsolute(200, () =>
{
res.Subscribe(z =>
{
if (z == 4)
throw ex;
});
});
try
{
scheduler.Start();
Assert.Fail();
}
catch (Exception err)
{
Assert.AreSame(ex, err);
}
Assert.AreEqual(225, scheduler.Clock);
xs.Subscriptions.AssertEqual(
Subscribe(200, 225)
);
ys.Subscriptions.AssertEqual(
Subscribe(200, 225)
);
}
[TestMethod]
public void Producer_ObserverThrows_CustomObserver()
{
var ex = new Exception();
var scheduler = new TestScheduler();
var xs = scheduler.CreateHotObservable<int>(
OnNext(210, 1),
OnNext(220, 2),
OnNext(230, 3)
);
var ys = scheduler.CreateHotObservable<int>(
OnNext(215, 1),
OnNext(225, 2),
OnNext(235, 3)
);
var res = xs.CombineLatest(ys, (x, y) => x + y); // This creates a Producer object
scheduler.ScheduleAbsolute(200, () =>
{
res.Subscribe(new MyObserver(x => x == 4, ex));
});
try
{
scheduler.Start();
Assert.Fail();
}
catch (Exception err)
{
Assert.AreSame(ex, err);
}
Assert.AreEqual(225, scheduler.Clock);
xs.Subscriptions.AssertEqual(
Subscribe(200, 225)
);
ys.Subscriptions.AssertEqual(
Subscribe(200, 225)
);
}
class MyObserver : ObserverBase<int>
{
private readonly Func<int, bool> _predicate;
private readonly Exception _exception;
public MyObserver(Func<int, bool> predicate, Exception exception)
{
_predicate = predicate;
_exception = exception;
}
protected override void OnNextCore(int value)
{
if (_predicate(value))
throw _exception;
}
protected override void OnErrorCore(Exception error)
{
}
protected override void OnCompletedCore()
{
}
}
}
}
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