Add a test suite for the domain logic and the server routes.

The project had no automated verification at all, so the "Test" step in
the AGENTS.md workflow rested entirely on clicking through the app.

The suite runs on bun with node:assert and adds no dependency: every file
is a script that exits non-zero when a check fails, and test/run.ts runs
each one in its own process. Unit tests cover the rules that decide what
players see (badges, streaks, ball duty rotation, ratings, MVP ties,
scouting totals, goals, notifications, CSI parsing); integration and
end-to-end tests drive the real dev server. Nothing writes to the
database, so both can be pointed at a live environment.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

test/unit/cacche.test.ts

@@ -0,0 +1,55 @@
+/** Check del sondaggio cacche: `bun test/unit/cacche.test.ts`. */
+import assert from "node:assert/strict";
+import {
+  mediaPartita,
+  mediaStagione,
+  recordStagione,
+  statisticheCacche,
+  type RigaCacche,
+} from "@/lib/cacche";
+
+const r = (evento_id: string, giocatore_id: string, quantita: number): RigaCacche => ({
+  evento_id,
+  giocatore_id,
+  quantita,
+});
+
+const righe: RigaCacche[] = [
+  r("e1", "g1", 3),
+  r("e2", "g1", 4),
+  r("e1", "g2", 1),
+  r("e2", "g2", 2),
+];
+
+// --- statisticheCacche -------------------------------------------------------
+const stat = statisticheCacche(righe);
+assert.deepEqual(stat["g1"], { totale: 7, giornate: 2, media: 3.5, record: 4, giornateTop: 2 });
+assert.deepEqual(stat["g2"], { totale: 3, giornate: 2, media: 1.5, record: 2, giornateTop: 0 });
+assert.deepEqual(statisticheCacche([]), {});
+
+// giornateTop è la soglia del badge segreto: 3 conta, 2 no.
+assert.equal(statisticheCacche([r("e1", "g9", 3)])["g9"]?.giornateTop, 1);
+assert.equal(statisticheCacche([r("e1", "g9", 2)])["g9"]?.giornateTop, 0);
+
+// Uno zero dichiarato è una giornata censita, non un dato mancante.
+const conZero = statisticheCacche([r("e1", "g7", 0)])["g7"]!;
+assert.deepEqual([conZero.giornate, conZero.media, conZero.record], [1, 0, 0]);
+
+// --- medie -------------------------------------------------------------------
+assert.equal(mediaPartita(righe, "e1"), 2, "(3+1)/2");
+assert.equal(mediaPartita(righe, "e2"), 3, "(4+2)/2");
+assert.equal(mediaPartita(righe, "inesistente"), 0, "nessun dato: zero, non NaN");
+assert.equal(mediaStagione(righe), 2.5);
+assert.equal(mediaStagione([]), 0);
+assert.equal(mediaStagione([r("e1", "g1", 1), r("e1", "g2", 2), r("e1", "g3", 2)]), 1.7);
+
+// --- recordStagione ----------------------------------------------------------
+assert.deepEqual(recordStagione(righe), r("e2", "g1", 4));
+assert.equal(recordStagione([]), null);
+assert.deepEqual(
+  recordStagione([r("e1", "g1", 4), r("e2", "g2", 4)]),
+  r("e1", "g1", 4),
+  "a parità vince chi l'ha fatto per primo",
+);
+
+console.log("cacche: ok");