Add testing interfaces for the stream and writer of the NIOAsyncChannel
#2488
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Motivation
When using the
NIOAsyncChannel
to build higher level abstractions it is hard to test right now since one cannot drive theNIOAsyncChannelInputStream
nor theNIOAsyncChannelOutputWriter
.Modification
This PR adds new factory methods to both of those types which allow to either drive the input stream or record the outputs written to the output writer.
Result
One can now successfully test their code written on top of the input stream and output writer.