RTEMS | Draft: termios01: Cover the rates set_best_baud's test skips (!1445)

[Sam Price (@TheSamPrice)]

Sam Price created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1445

Project:Branches: TheSamPrice/rtems:demo/termios-setbestbaud-gap to rtems/rtos/rtems:main
Author:   Sam Price



## Summary

termios01: Cover the rates set_best_baud's test skips

test_set_best_baud() probes 9600, 19200, 38400, 57600 and up, and
skips every extension rate.  That region is where
rtems_termios_baud_table is not in the ascending numeric order that
rtems_termios_set_best_baud()'s search assumes: the table lists B28800
after B38400.

Add the skipped exact rates and one midpoint.  Two of the new cases
fail today, and the failure is the point: it shows the coverage gap
hid a real defect.  Requesting exactly 28800 returns B19200, because
the search stops at B38400 with a midpoint of 28800 and rounds down to
the entry before it, which the out-of-place B28800 row is not.  And
40000 selects B28800, reached through that same out-of-place row.  The
test exits at the first of these, the 28800 case.

The fix belongs to the table, not to this test; this commit only makes
the defect visible.

Signed-off-by: Samuel Price <thesamprice at gmail.com>
Assisted-by: Claude Fable 5 <noreply at anthropic.com>


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