test: add tests of 'read' and 'write' shell commands
Reviewed-by:Simon Glass <sjg@chromium.org> Signed-off-by:
Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Reviewed-by:Simon Glass <sjg@chromium.org> Signed-off-by:
Rasmus Villemoes <rasmus.villemoes@prevas.dk>