public async Task Handle_relays_sequentially(
Random random,
ConcurrentQueue <int> log,
Message message)
{
// Arrange
var handlers = new IMessageHandler[10];
for (int i = 0; i < handlers.Length; i++)
{
int order = i;
handlers[i] = new DelegatingMessageHandler(async _ =>
{
await Task.Delay(millisecondsDelay: random.Next(100, 1000));
log.Enqueue(order);
});
}
var sut = new SequentialCompositeMessageHandler(handlers);
// Act
await sut.Handle(message);
// Assert
log.Should().BeInAscendingOrder();
}
public void if_all_handlers_cannot_handle_message_CanHandle_returns_false(
IMessageHandler[] handlers, Message message)
{
var sut = new SequentialCompositeMessageHandler(handlers);
bool actual = sut.CanHandle(message);
actual.Should().BeFalse();
}
public void if_some_handler_can_handle_message_CanHandle_returns_true(
IMessageHandler[] handlers, Message message)
{
var sut = new SequentialCompositeMessageHandler(handlers);
IMessageHandler some = handlers.OrderBy(x => x.GetHashCode()).First();
Mock.Get(some).Setup(x => x.CanHandle(message)).Returns(true);
bool actual = sut.CanHandle(message);
actual.Should().BeTrue();
}
public async Task Handle_does_not_relay_to_handlers_not_able_to_handle_message(
IMessageHandler[] handlers, Message message)
{
var sut = new SequentialCompositeMessageHandler(handlers);
var some = handlers.OrderBy(x => x.GetHashCode()).Skip(1).ToList();
some.ForEach(handler => Mock.Get(handler).Setup(x => x.CanHandle(message)).Returns(false));
await sut.Handle(message);
foreach (IMessageHandler handler in some)
{
Mock.Get(handler).Verify(x => x.Handle(message), Times.Never());
}
}