public async Task Observable_Current_returns_latest_element()
{
var subject = new BehaviorSubject <int>(1);
var asyncEnumerable = subject.Current();
await using (var asyncEnumerator = asyncEnumerable.GetAsyncEnumerator())
{
subject.OnNext(2);
subject.OnNext(3);
subject.OnNext(4);
Assert.True(await asyncEnumerator.MoveNextAsync());
Assert.Equal(4, asyncEnumerator.Current);
}
}
public async Task Observable_Current_returns_latest_element()
{
var subject = new BehaviorSubject<int>(1);
var asyncEnumerable = subject.Current();
using (var asyncEnumerator = asyncEnumerable.GetEnumerator())
{
subject.OnNext(2);
subject.OnNext(3);
subject.OnNext(4);
Assert.True(await asyncEnumerator.MoveNext(CancellationToken.None));
Assert.Equal(4, asyncEnumerator.Current);
}
}
public async Task Observable_Current_completes_on_source_completion()
{
var subject = new BehaviorSubject <int>(1);
var asyncEnumerable = subject.Current();
await using (var asyncEnumerator = asyncEnumerable.GetAsyncEnumerator())
{
subject.OnNext(1);
subject.OnNext(2);
subject.OnNext(3);
subject.OnCompleted();
Assert.False(await asyncEnumerator.MoveNextAsync());
}
}
public async Task Observable_Current_propagates_exception()
{
var subject = new BehaviorSubject <int>(1);
var asyncEnumerable = subject.Current();
await using (var asyncEnumerator = asyncEnumerable.GetAsyncEnumerator())
{
subject.OnNext(1);
subject.OnNext(2);
subject.OnNext(3);
subject.OnError(new DivideByZeroException());
asyncEnumerator
.Awaiting(_ => _.MoveNextAsync().AsTask())
.Should()
.ThrowExactly <DivideByZeroException>();
}
}
public async Task Observable_Current_returns_elements_repeatedly()
{
var subject = new BehaviorSubject<int>(1);
var asyncEnumerable = subject.Current();
using (var asyncEnumerator = asyncEnumerable.GetEnumerator())
{
for (var i = 0; i < 10; i++)
{
Assert.True(await asyncEnumerator.MoveNext(CancellationToken.None));
Assert.Equal(1, asyncEnumerator.Current);
}
subject.OnNext(2);
for (var i = 0; i < 10; i++)
{
Assert.True(await asyncEnumerator.MoveNext(CancellationToken.None));
Assert.Equal(2, asyncEnumerator.Current);
}
}
}
public async Task Observable_Current_returns_elements_repeatedly()
{
var subject = new BehaviorSubject <int>(1);
var asyncEnumerable = subject.Current();
await using (var asyncEnumerator = asyncEnumerable.GetAsyncEnumerator())
{
for (var i = 0; i < 10; i++)
{
Assert.True(await asyncEnumerator.MoveNextAsync());
Assert.Equal(1, asyncEnumerator.Current);
}
subject.OnNext(2);
for (var i = 0; i < 10; i++)
{
Assert.True(await asyncEnumerator.MoveNextAsync());
Assert.Equal(2, asyncEnumerator.Current);
}
}
}
public async Task Observable_Current_completes_on_source_completion()
{
var subject = new BehaviorSubject<int>(1);
var asyncEnumerable = subject.Current();
using (var asyncEnumerator = asyncEnumerable.GetEnumerator())
{
subject.OnNext(1);
subject.OnNext(2);
subject.OnNext(3);
subject.OnCompleted();
Assert.False(await asyncEnumerator.MoveNext(CancellationToken.None));
}
}
public async Task Observable_Current_propagates_exception()
{
var subject = new BehaviorSubject<int>(1);
var asyncEnumerable = subject.Current();
using (var asyncEnumerator = asyncEnumerable.GetEnumerator())
{
subject.OnNext(1);
subject.OnNext(2);
subject.OnNext(3);
subject.OnError(new InvalidOperationException());
asyncEnumerator
.Awaiting(_ => _.MoveNext(CancellationToken.None))
.ShouldThrowExactly<AggregateException>()
.Where(ex => ex.GetBaseException() is InvalidOperationException);
}
}
