public async Task PublishAsync_should_throw_ArgumentNullException_when_message_null()
{
var channelFactory = NSubstitute.Substitute.For <IChannelFactory>();
var sut = new InMemoryPublisher(channelFactory);
await Assert.ThrowsAsync <ArgumentNullException>(async() => await sut.PublishAsync(null));
}
public async Task PublishAsync_should_write_message_to_proper_channel()
{
var message = DummyMessage.New();
var channelFactory = NSubstitute.Substitute.For <IChannelFactory>();
var writer = NSubstitute.Substitute.For <ChannelWriter <DummyMessage> >();
channelFactory.GetWriter <DummyMessage>()
.Returns(writer);
var sut = new InMemoryPublisher(channelFactory);
await sut.PublishAsync(message);
await writer.Received(1)
.WriteAsync(message, Arg.Any <CancellationToken>());
}