public void Connect_returns_connection_instances_connected_to_each_other_for_every_call()
{
// Arrange
var sut = new StreamFactory <int, Model>();
var modelId = _fixture.Create <int>();
// Act
var actual = new List <IConnection <Model> >(
from _ in Enumerable.Range(0, 3)
select sut.Connect(modelId));
// Assert
foreach (IConnection <Model> source in actual)
{
var observers = new List <IObserver <Model> >();
var subscriptions = new List <IDisposable>();
foreach (IConnection <Model> target in actual)
{
var observer = Mock.Of <IObserver <Model> >();
IDisposable subscription = target.Subscribe(observer);
observers.Add(observer);
subscriptions.Add(subscription);
}
var revision = new Model(modelId);
source.Emit(revision);
foreach (IObserver <Model> observer in observers)
{
Mock.Get(observer).Verify(x => x.OnNext(revision), Once());
}
}
}
public void Stream_does_not_emit_null_value()
{
// Arrange
int modelId = _fixture.Create <int>();
var factory = new StreamFactory <int, Model>(
Mock.Of <IStreamFilter <Model> >());
IConnection <Model> connection = factory.Connect(modelId);
var observer = Mock.Of <IObserver <Model> >();
connection.Subscribe(observer);
// Act
connection.Emit(Observable.Return(default(Model)));
// Assert
Mock.Get(observer).Verify(
x => x.OnNext(IsAny <Model>()),
Never());
Mock.Get(observer).Verify(
x => x.OnError(IsAny <Exception>()),
Never());
Mock.Get(factory.Filter).Verify(
x => x.Execute(IsAny <Model>(), IsAny <Model>()),
Never());
}
public void Stream_sends_last_revision_to_filter()
{
// Arrange
int modelId = _fixture.Create <int>();
var firstRevision = new Model(modelId);
var secondRevision = new Model(modelId);
var factory = new StreamFactory <int, Model>(
Mock.Of <IStreamFilter <Model> >());
Mock.Get(factory.Filter)
.Setup(x => x.Execute(firstRevision, null))
.Returns(firstRevision);
IConnection <Model> connection = factory.Connect(modelId);
connection.Emit(firstRevision);
// Act
connection.Emit(secondRevision);
// Assert
Mock.Get(factory.Filter).Verify(
x => x.Execute(secondRevision, firstRevision), Once());
}
public void Subscribe_connects_observer_with_stream()
{
// Arrange
var factory = new StreamFactory <int, Model>();
var modelId = _fixture.Create <int>();
IConnection <Model> sut = factory.Connect(modelId);
var observer = Mock.Of <IObserver <Model> >();
sut.Subscribe(observer);
var revision = new Model(modelId);
// Act
factory.Connect(modelId).Emit(revision);
// Assert
Mock.Get(observer).Verify(x => x.OnNext(revision), Once());
}
public void Connect_returns_connection_instance()
{
var sut = new StreamFactory <int, Model>();
var modelId = _fixture.Create <int>();
IConnection <int, Model> actual = sut.Connect(modelId);
actual.Should().NotBeNull();
actual.ModelId.Should().Be(modelId);
}
public void ExistsFor_returns_true_for_model_id_with_which_stream_created()
{
var sut = new StreamFactory <int, Model>();
var modelId = _fixture.Create <int>();
IConnection <Model> connection = sut.Connect(modelId);
bool actual = sut.ExistsFor(modelId);
actual.Should().BeTrue();
}
public void Connect_returns_new_instances_for_every_call()
{
var sut = new StreamFactory <int, Model>();
var modelId = _fixture.Create <int>();
var actual = new List <IConnection <Model> >(
from _ in Enumerable.Range(0, 3)
select sut.Connect(modelId));
actual.Should().OnlyContain(x => x != null);
actual.ShouldAllBeEquivalentTo(actual.Distinct());
}
public void Subscribe_connects_observer_with_stream_weakly()
{
// Arrange
var factory = new StreamFactory <int, Model>();
var modelId = _fixture.Create <int>();
IConnection <Model> connection = factory.Connect(modelId);
var reference = new WeakReference(connection);
var observer = Mock.Of <IObserver <Model> >();
connection.Subscribe(observer);
// Act
connection = null;
GC.Collect();
GC.WaitForPendingFinalizers();
factory.Connect(modelId).Emit(new Model(modelId));
// Assert
reference.IsAlive.Should().BeFalse();
Mock.Get(observer).Verify(x => x.OnNext(IsAny <Model>()), Never());
}
public void sut_subscribes_only_models_having_specified_model_id()
{
// Arrange
var factory = new StreamFactory <int, Model>();
var idGenerator = new Generator <int>(_fixture);
var modelId = idGenerator.First();
IConnection <Model> sut = factory.Connect(modelId);
var observer = Mock.Of <IObserver <Model> >();
sut.Subscribe(observer);
var otherModelId = idGenerator.First(x => x != modelId);
IConnection <Model> otherConnection =
factory.Connect(otherModelId);
// Act
otherConnection.Emit(new Model(otherModelId));
// Assert
Mock.Get(observer).Verify(x => x.OnNext(IsAny <Model>()), Never());
}
public void sut_removes_unused_stream()
{
// Arrange
var factory = new StreamFactory <int, Model>();
var modelId = _fixture.Create <int>();
factory.Connect(modelId);
// Act
GC.Collect();
GC.WaitForPendingFinalizers();
// Assert
factory.ExistsFor(modelId).Should().BeFalse();
}
public void Stream_sends_new_revision_to_filter()
{
// Arrange
int modelId = _fixture.Create <int>();
var revision = new Model(modelId);
var factory = new StreamFactory <int, Model>(
Mock.Of <IStreamFilter <Model> >());
IConnection <Model> connection = factory.Connect(modelId);
// Act
connection.Emit(revision);
// Assert
Mock.Get(factory.Filter).Verify(
x => x.Execute(revision, null), Once());
}
public void Stream_fails_if_model_id_invalid()
{
// Arrange
var idGenerator = new Generator <int>(_fixture);
int modelId = idGenerator.First();
int invalidModelId = idGenerator.First(x => x != modelId);
var factory = new StreamFactory <int, Model>();
IConnection <Model> connection = factory.Connect(modelId);
var observer = Mock.Of <IObserver <Model> >();
connection.Subscribe(observer);
// Act
connection.Emit(new Model(invalidModelId));
// Assert
Mock.Get(observer).Verify(
x => x.OnError(IsAny <InvalidOperationException>()), Once());
}
public void Stream_does_not_send_value_to_connections_if_filter_returns_null()
{
// Arrange
int modelId = _fixture.Create <int>();
var revision = new Model(modelId);
Model filtered = null;
var factory = new StreamFactory <int, Model>(
Mock.Of <IStreamFilter <Model> >(x =>
x.Execute(revision, null) == filtered));
IConnection <Model> connection = factory.Connect(modelId);
var observer = Mock.Of <IObserver <Model> >();
connection.Subscribe(observer);
// Act
connection.Emit(revision);
// Assert
Mock.Get(observer).Verify(x => x.OnNext(IsAny <Model>()), Never());
}
public void Stream_sends_filter_result_to_connections()
{
// Arrange
int modelId = _fixture.Create <int>();
var revision = new Model(modelId);
var filtered = new Model(modelId);
var factory = new StreamFactory <int, Model>(
Mock.Of <IStreamFilter <Model> >(x =>
x.Execute(revision, null) == filtered));
IConnection <Model> connection = factory.Connect(modelId);
var observer = Mock.Of <IObserver <Model> >();
connection.Subscribe(observer);
// Act
connection.Emit(revision);
// Assert
Mock.Get(observer).Verify(x => x.OnNext(filtered), Once());
}