efi_selftest: Add box drawing character selftest
UEFI applications rely on Unicode output capability, and might use that for drawing pseudo-graphical interfaces using Unicode defined box drawing characters. Add a simple test to display the most basic box characters, which would need to be checked manually on the screen for correctness. Signed-off-by:Andre Przywara <andre.przywara@arm.com> Suggested-by:
Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by:
Janne Grunau <j@jannau.net> Reviewed-by:
Heinrich Schuchardt <xypron.glpk@gmx.de>
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