public async Task When_Clearing_The_PostBox_On_The_Command_Processor_Async()
{
_fakeMessageStore.Add(_message);
await _commandProcessor.ClearPostBoxAsync(new [] { _message.Id });
//_should_send_a_message_via_the_messaging_gateway
_fakeMessageProducer.MessageWasSent.Should().BeTrue();
var sentMessage = _fakeMessageProducer.SentMessages.FirstOrDefault();
sentMessage.Should().NotBe(null);
sentMessage.Id.Should().Be(_message.Id);
sentMessage.Header.Topic.Should().Be(_message.Header.Topic);
sentMessage.Body.Value.Should().Be(_message.Body.Value);
}