public async Task CreateStreamConsumerAsync_WhenConsumerExists_CreatesIt(
[Frozen] Mock <IEventStreamConsumers> consumerRegistryMock,
EventStoreConnection eventStoreConnection,
string streamName,
string consumerName)
{
var consumer = await eventStoreConnection.CreateStreamConsumerAsync(streamName, consumerName);
Assert.NotNull(consumer);
Assert.IsType <EventStreamConsumer>(consumer);
}