flan/test/dune
Joseph Ferano 3ace7c262f A hang is a failure the suite never reported
The mutation pass turned up one defect that did not make the suite go
red: a reader branch that forgets to advance reads the same character
for ever, and dune test waits as long as it is left to. In CI that is a
job killed by the runner with nothing named and no output to read.

watchdog.ml puts an alarm on every test binary — generous, because an
alarm that fires on a slow machine is a flake — and a five-second one
around each read in test_flan, where the budget really is small. The
first read that does not return wedges the rest, so a looping reader
costs five seconds and names the row instead of costing eight minutes
or never finishing. Both were watched: the string-escape loop now fails
in five seconds with the case named, and the per-binary backstop was
armed short and observed to fire.
2026-09-12 10:49:07 +07:00

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(tests
(names test_flan test_acceptance test_reload test_agent test_session test_dev test_emacs test_repl test_cider)
; Explicit because test_sanitize lives in this directory and is not one of
; these: two stanzas in one directory have to say which modules are whose.
; watchdog is every binary's clock: a hanging test reports nothing, so each
; of these arms an alarm that turns "for ever" into a failing run.
(modules test_flan test_acceptance test_reload test_agent test_session
test_dev test_emacs test_repl test_cider watchdog)
(libraries flan unix)
; The acceptance programs are part of the test corpus: if the reader, the
; parser or the checker regresses on them we want to know here, not at the CLI.
(deps
(file %{workspace_root}/calc-me.flan)
(file %{workspace_root}/sand.flan)
; The raylib bindings, because sand.flan and the FFI case import them and an
; import reads the directory at build time. sand.flan itself is above: the
; headless case imports it as a single-file package.
(glob_files %{workspace_root}/vendor/raylib/*)
; The dev agent package: its Flan declarations and the C that implements them.
(glob_files %{workspace_root}/vendor/agent/*)
; The EDN tokenizer, which programs/edn.flan imports.
(glob_files %{workspace_root}/vendor/edn/*)
; The ported raylib examples. Only one of them has a headless acceptance
; case, but it imports its example as a package and that example imports
; examples/digits.flan, so the directory has to be here whole.
(glob_files %{workspace_root}/examples/*)
(glob_files programs/*.flan)
; The reload primitive's host: a C main that dlopens what Build.shared made.
(file reload_host.c)
; test_dev runs the compiler itself: flan dev launches and owns a program.
(file %{workspace_root}/bin/main.exe)
; The Emacs client, which test_emacs drives against a real daemon.
(glob_files %{workspace_root}/emacs/*.el)
; The WASI host the wasm32 case runs its module under, when no wasmtime or
; wasmer is installed.
(file wasm-run.mjs)))
; The corpus a second time under ASan and UBSan. Its own alias and not part of
; `dune test`: a sanitized build is a statically linked 1.8MB binary that takes
; tens of seconds to produce, so the sweep is minutes against the existing
; suite's seconds, and a test nobody will wait for is a test nobody runs.
;
; dune build --root . @sanitize
; An executable plus a rule rather than a (test ...): a test stanza attaches
; to the @runtest alias and offers no way to be attached to another one, which
; is the whole point here.
(executable
(name test_sanitize)
(modules test_sanitize watchdog)
(libraries flan unix))
(rule
(alias sanitize)
(deps
test_sanitize.exe
(file %{workspace_root}/calc-me.flan)
(file %{workspace_root}/sand.flan)
(glob_files %{workspace_root}/vendor/raylib/*)
(glob_files %{workspace_root}/vendor/agent/*)
(glob_files %{workspace_root}/vendor/edn/*)
(glob_files %{workspace_root}/examples/*)
(glob_files programs/*.flan))
(action (run ./test_sanitize.exe)))