Test that read callback is called only once even if i bit more was read into the buffer.
Test that read callback is called only once even if i bit more was read
into the buffer.

mloy/cjet,mloy/cjet,gatzka/cjet,gatzka/cjet,gatzka/cjet,gatzka/cjet,mloy/cjet,mloy/cjet,gatzka/cjet,mloy/cjet