https://gitlab.synchro.net/main/sbbs/-/commit/d64877aed4b1d96d3acd3131
Added Files:
src/xpdev/mixertest.c
Modified Files:
src/xpdev/GNUmakefile Makefile targets.mk
Log Message:
xpdev: add mixertest, a headless regression test for the mixer

Guards the xp_mixer_pull() gapless-hand-off fix in the previous commit:
it drives the mixer directly with no audio device and asserts that a
queued buffer ending part way through a pull hands off to its successor
with no silent gap -- across two/three/N buffers, drain-to-empty, exact buffer/pull alignment and consumed state carried across pulls -- while
the crossfade overlay still mixes its pair concurrently. Against the
pre-fix mixer it reports failures and a nonzero exit; against the fix,
zero.

xpdev had no automated, self-checking test before this -- wraptest is interactive. Wired in following the wraptest pattern: "make tests" builds mixertest alongside the others, and "make test" builds and RUNS it
(nonzero exit == failure) for CI. The recipe runs it through $(VALGRIND),
which is empty by default -- a plain "make test" runs the binary directly
-- and which CI sets to a valgrind command line where the leak checker is available.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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