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Mar 30, 2023
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94 changes: 43 additions & 51 deletions src/core/Akka.Streams.Tests/Dsl/ObservableSourceSpec.cs
Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
using System;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;
using Akka.Streams.Dsl;
using Akka.Streams.TestKit;
using Akka.TestKit;
Expand Down Expand Up @@ -70,71 +71,68 @@ public ObservableSourceSpec(ITestOutputHelper helper) : base(SpecConfig, helper)
}

[Fact]
public void An_ObservableSource_must_subscribe_to_an_observable()
public async Task An_ObservableSource_must_subscribe_to_an_observable()
{
this.AssertAllStagesStopped(() =>
await this.AssertAllStagesStoppedAsync(async() =>
{

var o = new TestObservable<int>();
var s = this.CreateManualSubscriberProbe<int>();
Source.FromObservable(o)
.To(Sink.FromSubscriber(s))
.Run(_materializer);

var sub = s.ExpectSubscription();
var sub = await s.ExpectSubscriptionAsync();

o.Complete();
}, _materializer);
}

[Fact]
public void An_ObservableSource_must_receive_events_from_an_observable()
public async Task An_ObservableSource_must_receive_events_from_an_observable()
{
this.AssertAllStagesStopped(() =>
{
await this.AssertAllStagesStoppedAsync(async() => {
var o = new TestObservable<int>();
var s = this.CreateManualSubscriberProbe<int>();
Source.FromObservable(o)
.To(Sink.FromSubscriber(s))
.Run(_materializer);

var sub = s.ExpectSubscription();
var sub = await s.ExpectSubscriptionAsync();

sub.Request(2);

o.Event(1);
o.Event(2);
o.Event(3);

s.ExpectNext(1);
s.ExpectNext(2);
await s.ExpectNextAsync(1);
await s.ExpectNextAsync(2);
s.ExpectNoMsg();

sub.Request(2);

s.ExpectNext(3);
await s.ExpectNextAsync(3);
s.ExpectNoMsg();

o.Event(4);

s.ExpectNext(4);
await s.ExpectNextAsync(4);

o.Complete();
}, _materializer);
}

[Fact(Skip = "Buggy")]
public void An_ObservableSource_must_receive_errors_from_an_observable()
public async Task An_ObservableSource_must_receive_errors_from_an_observable()
{
this.AssertAllStagesStopped(() =>
{
await this.AssertAllStagesStoppedAsync(async() => {
var o = new TestObservable<int>();
var s = this.CreateManualSubscriberProbe<int>();
Source.FromObservable(o)
.To(Sink.FromSubscriber(s))
.Run(_materializer);

var sub = s.ExpectSubscription();
var sub = await s.ExpectSubscriptionAsync();
sub.Request(2);

var e = new Exception("hello");
Expand All @@ -143,157 +141,151 @@ public void An_ObservableSource_must_receive_errors_from_an_observable()
o.Error(e);
o.Event(2);

s.ExpectNext(1);
await s.ExpectNextAsync(1);
s.ExpectError().ShouldBe(e);
s.ExpectNoMsg();
}, _materializer);
}

[Fact]
public void An_ObservableSource_must_receive_completion_from_an_observable()
public async Task An_ObservableSource_must_receive_completion_from_an_observable()
{
this.AssertAllStagesStopped(() =>
{
await this.AssertAllStagesStoppedAsync(async() => {
var o = new TestObservable<int>();
var s = this.CreateManualSubscriberProbe<int>();
Source.FromObservable(o)
.To(Sink.FromSubscriber(s))
.Run(_materializer);

var sub = s.ExpectSubscription();
var sub = await s.ExpectSubscriptionAsync();

o.Event(1);
o.Complete();

sub.Request(5);
s.ExpectComplete();

await s.ExpectCompleteAsync();
}, _materializer);
}

[Fact]
public void An_ObservableSource_must_be_able_to_unsubscribe()
public async Task An_ObservableSource_must_be_able_to_unsubscribe()
{
this.AssertAllStagesStopped(() =>
{
await this.AssertAllStagesStoppedAsync(async() => {
var o = new TestObservable<int>();
var s = this.CreateManualSubscriberProbe<int>();
Source.FromObservable(o)
.To(Sink.FromSubscriber(s))
.Run(_materializer);

var sub = s.ExpectSubscription();
var sub = await s.ExpectSubscriptionAsync();

o.Event(1);

sub.Cancel();

Thread.Sleep(100);
await Task.Delay(100);

o.Subscribed.ShouldBeFalse();
}, _materializer);
}

[Fact]
public void An_ObservableSource_must_ignore_new_element_on_DropNew_overflow()
public async Task An_ObservableSource_must_ignore_new_element_on_DropNew_overflow()
{
this.AssertAllStagesStopped(() =>
{
await this.AssertAllStagesStoppedAsync(async() => {
var o = new TestObservable<int>();
var s = this.CreateManualSubscriberProbe<int>();
Source.FromObservable(o, maxBufferCapacity: 2, overflowStrategy: OverflowStrategy.DropNew)
.To(Sink.FromSubscriber(s))
.Run(_materializer);

var sub = s.ExpectSubscription();
var sub = await s.ExpectSubscriptionAsync();

o.Event(1);
o.Event(2);
o.Event(3); // this should be dropped

sub.Request(3);

s.ExpectNext(1);
s.ExpectNext(2);
await s.ExpectNextAsync(1);
await s.ExpectNextAsync(2);
s.ExpectNoMsg();

sub.Cancel();
}, _materializer);
}

[Fact]
public void An_ObservableSource_must_drop_oldest_element_on_DropHead_overflow()
public async Task An_ObservableSource_must_drop_oldest_element_on_DropHead_overflow()
{
this.AssertAllStagesStopped(() =>
{
await this.AssertAllStagesStoppedAsync(async() => {
var o = new TestObservable<int>();
var s = this.CreateManualSubscriberProbe<int>();
Source.FromObservable(o, maxBufferCapacity: 2, overflowStrategy: OverflowStrategy.DropHead)
.To(Sink.FromSubscriber(s))
.Run(_materializer);

var sub = s.ExpectSubscription();
var sub = await s.ExpectSubscriptionAsync();

o.Event(1); // this should be dropped
o.Event(2);
o.Event(3);

sub.Request(3);

s.ExpectNext(2);
s.ExpectNext(3);
await s.ExpectNextAsync(2);
await s.ExpectNextAsync(3);
s.ExpectNoMsg();

sub.Cancel();
}, _materializer);
}

[Fact]
public void An_ObservableSource_must_drop_newest_element_on_DropTail_overflow()
public async Task An_ObservableSource_must_drop_newest_element_on_DropTail_overflow()
{
this.AssertAllStagesStopped(() =>
{
await this.AssertAllStagesStoppedAsync(async() => {
var o = new TestObservable<int>();
var s = this.CreateManualSubscriberProbe<int>();
Source.FromObservable(o, maxBufferCapacity: 2, overflowStrategy: OverflowStrategy.DropTail)
.To(Sink.FromSubscriber(s))
.Run(_materializer);

var sub = s.ExpectSubscription();
var sub = await s.ExpectSubscriptionAsync();

o.Event(1);
o.Event(2); // this should be dropped
o.Event(3);

sub.Request(3);

s.ExpectNext(1);
s.ExpectNext(3);
await s.ExpectNextAsync(1);
await s.ExpectNextAsync(3);
s.ExpectNoMsg();

sub.Cancel();
}, _materializer);
}

[Fact]
public void An_ObservableSource_must_fail_on_Fail_overflow()
public async Task An_ObservableSource_must_fail_on_Fail_overflow()
{
this.AssertAllStagesStopped(() =>
{
await this.AssertAllStagesStoppedAsync(async() => {
var o = new TestObservable<int>();
var s = this.CreateManualSubscriberProbe<int>();
Source.FromObservable(o, maxBufferCapacity: 2, overflowStrategy: OverflowStrategy.Fail)
.To(Sink.FromSubscriber(s))
.Run(_materializer);

var sub = s.ExpectSubscription();
var sub = await s.ExpectSubscriptionAsync();

o.Event(1);
o.Event(2);
o.Event(3); // this should cause an error

sub.Request(3);

s.ExpectError();
s.ExpectNoMsg();

Expand Down