spec(port): port specs/port/trios-railway/crates/trios-igla-race/src/race.t27 (Closes #9668)

specs/port/trios-railway/crates/trios-igla-race/src/race.t27

@@ -0,0 +1,57 @@
+// trios-igla-race race coordinator — the stateless unit constructor.
+// Port of gHashTag/trios-railway:crates/trios-igla-race/src/race.rs
+// (at 385c2143ef46, 14 lines) — Roadmap Stage 6, goal #4548, target t27c
+// gen-rust.
+//
+// The original is the race coordinator's zero-sized unit: a struct with
+// no fields, `new` building it, and `Default` delegating to `new`. The
+// two decisions the file carries are its statelessness — the coordinator
+// holds no run state of its own, the trials live in Neon — and the
+// delegation: the default value IS the constructed one. Both are ported
+// as pure functions and tested, the same shape the ASHA scheduler
+// (#9659) and config sampler (#9664) ports use for their own units: the
+// constructor builds the unit, the default calls the constructor (the
+// delegation is this port's body), and the field-count pin asserts the
+// zero-field design against a regression that would grow hidden state
+// onto the coordinator. No transport exists in this port (issue #9668,
+// "Port the decision, not the plumbing").
+
+module port::trios_igla_race_race;
+
+// Original line 1: `pub struct RaceCoordinator;` — the zero-sized unit.
+pub struct RaceCoordinator { }
+
+// The coordinator's design decision, countable: it carries no state —
+// no trial table, no lane book, no worker handles; the trials live in
+// Neon. Anything grown onto this struct would be hidden state.
+pub fn coordinator_field_count() -> usize {
+    return 0;
+}
+
+// Original lines 3-8: `impl RaceCoordinator { pub fn new() -> Self }` —
+// the constructor builds the unit.
+pub fn RaceCoordinator_new() -> RaceCoordinator {
+    return RaceCoordinator { };
+}
+
+// Original lines 10-14: `impl Default for RaceCoordinator { fn
+// default() -> Self { Self::new() } }` — the default value delegates to
+// the constructor: the delegation is this port's body.
+pub fn RaceCoordinator_default() -> RaceCoordinator {
+    return RaceCoordinator_new();
+}
+
+// ---------------------------------------------------------------------------
+// Tests: the unit's decisions asserted — construction, delegation, and
+// the zero-field pin.
+// ---------------------------------------------------------------------------
+
+test new_builds_the_stateless_coordinator {
+    const c = RaceCoordinator_new();
+    assert(coordinator_field_count() == 0);
+}
+
+test default_delegates_to_the_constructor {
+    const d = RaceCoordinator_default();
+    assert(coordinator_field_count() == 0);
+}