`RandomName` builds the suffix as two independent `rand.Intn(1000)`
calls, so the two 4-digit halves collide on ~0.1% of runs. The
sub-test asserted `g[2] != g[3]`, which flakes whenever the same
value lands twice — once per ~1000 sub-runs per class, so across
the seven `PlanetClass` rows the integration suite hit it on
`#199 go-unit.yaml` against `feature/subscribe-events-heartbeat`
(`"0074"` collision).
Distinctness is not a property `RandomName` promises and is not
load-bearing for callers: `game/internal/controller/generate_game.go`
uses these names for planet labels and already tolerates duplicate
names across planets, so collisions inside one name are no worse
than collisions between names. Drop the assert; keep the format and
class-prefix checks, which are the actual contract.
Stress-tested with `-count=200`: 200 consecutive iterations × 7
classes = 1400 sub-runs without a single failure where the prior
version's flake probability would have surfaced ~once on average.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Ilia Denisov