The example games failed on the CI runner with "ALSA: Couldn't open audio
device" despite SDL_AUDIODRIVER=dummy sitting right there in their CMake --
because it never reached the process. set_tests_properties parses its
PROPERTIES arguments as name/value pairs, so a semicolon-separated value
list is split and every element after the first is consumed as a bogus
property name: ENVIRONMENT kept only SDL_VIDEODRIVER=dummy, and the
LD_LIBRARY_PATH prepend list kept only its first directory. ctest
--show-only=json-v1 shows the truncation plainly.
Nobody could see it. Video survived because SDL3 falls through its driver
list to dummy on a headless machine with no hint at all; audio survived on
every developer machine because the real device works there; the library
paths survived because RPATH covered them. A runner with no sound card was
the first environment where any of it mattered.
Every list-valued test property now goes through set_property(TEST ...),
which takes real list arguments -- the examples' ENVIRONMENT triplets and
vendored-path modifications, the suites' LD_LIBRARY_PATH prepends, and the
docs harness's driver variables. Verified by property dump (3 environment
entries and all 7 prepends present) and by running the example tests with
ALSA_CONFIG_PATH=/dev/null, which now pass where a real ALSA open would
fail: the dummy driver is finally the one being asked.
Co-Authored-By: Claude Code (Claude Fable 5, claude-fable-5) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KzBDV2fqgnUAcqCKqKvc71
examples/uidemo is the program the UI chapter quotes. Three screens, three
ways of building an interface: the title screen is one akgl_UiMenu plus a
heading label; the options screen is written in raw CLAY() declarations --
hover highlighting inside the declaration, clicks paired with the
application's own press edge -- because the widgets are a convenience, not a
boundary; and the play screen is two HUD labels and the one-call dialog over
a checkerboard standing in for a game world. No tilemap, no actors, no
physics: everything left on screen is the subject.
Its route_event() is the documented call-order contract in the flesh -- UI
first, consumed events stop there, then the current screen's keys -- and the
screen routing is the focus model, stated rather than invented.
The headless smoke run (example_uidemo, --frames 240 --demo) tours every
path through the real event chain: a mouse click on the centred menu (the
consumed path, landing on the middle row by symmetry), keyboard into and out
of the options screen, the dialog opened and dismissed, and Quit confirmed
from the menu. The run prints its score and settings so a pass can be read,
not just counted. docs_game_figures gains a uidemo frame -- the play screen
with the dialog up -- for the chapter to come.
Co-Authored-By: Claude Code (Claude Fable 5, claude-fable-5) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KzBDV2fqgnUAcqCKqKvc71
