test: add 100% coverage for apps/api and packages/types

Adds full Vitest test suites with @vitest/coverage-v8, targeting 100%
statement/branch/function/line coverage. Uses v8 ignore comments for
genuinely unreachable defensive branches.

apps/api/test/routes/prestige.spec.ts

@@ -0,0 +1,156 @@
+/* eslint-disable max-lines-per-function -- Test suites naturally have many cases */
+/* eslint-disable max-lines -- Test suites naturally have many cases */
+/* eslint-disable @typescript-eslint/consistent-type-assertions -- Tests build minimal state objects */
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { Hono } from "hono";
+import type { GameState } from "@elysium/types";
+
+vi.mock("../../src/db/client.js", () => ({
+  prisma: {
+    player: { update: vi.fn() },
+    gameState: { findUnique: vi.fn(), update: vi.fn() },
+  },
+}));
+
+vi.mock("../../src/middleware/auth.js", () => ({
+  authMiddleware: vi.fn(async (c: { set: (key: string, value: string) => void }, next: () => Promise<void>) => {
+    c.set("discordId", "test_discord_id");
+    await next();
+  }),
+}));
+
+vi.mock("../../src/services/webhook.js", () => ({
+  postMilestoneWebhook: vi.fn().mockResolvedValue(undefined),
+}));
+
+const DISCORD_ID = "test_discord_id";
+
+const makeState = (overrides: Partial<GameState> = {}): GameState => ({
+  player: { discordId: DISCORD_ID, username: "u", discriminator: "0", avatar: null, totalGoldEarned: 1_000_000, totalClicks: 0, characterName: "T" },
+  resources: { gold: 0, essence: 0, crystals: 0, runestones: 0 },
+  adventurers: [],
+  upgrades: [],
+  quests: [],
+  bosses: [],
+  equipment: [],
+  achievements: [],
+  zones: [],
+  exploration: { areas: [], materials: [], craftedRecipeIds: [], craftedGoldMultiplier: 1, craftedEssenceMultiplier: 1, craftedClickMultiplier: 1, craftedCombatMultiplier: 1 },
+  companions: { unlockedCompanionIds: [], activeCompanionId: null },
+  prestige: { count: 0, runestones: 100, productionMultiplier: 1, purchasedUpgradeIds: [] },
+  baseClickPower: 1,
+  lastTickAt: 0,
+  schemaVersion: 1,
+  ...overrides,
+} as GameState);
+
+describe("prestige route", () => {
+  let app: Hono;
+  let prisma: {
+    player: { update: ReturnType<typeof vi.fn> };
+    gameState: { findUnique: ReturnType<typeof vi.fn>; update: ReturnType<typeof vi.fn> };
+  };
+
+  beforeEach(async () => {
+    vi.clearAllMocks();
+    const { prestigeRouter } = await import("../../src/routes/prestige.js");
+    const { prisma: p } = await import("../../src/db/client.js");
+    prisma = p as typeof prisma;
+    app = new Hono();
+    app.route("/prestige", prestigeRouter);
+  });
+
+  const post = (path: string, body?: Record<string, unknown>) =>
+    app.fetch(new Request(`http://localhost/prestige${path}`, {
+      method: "POST",
+      headers: body ? { "Content-Type": "application/json" } : undefined,
+      body: body ? JSON.stringify(body) : undefined,
+    }));
+
+  describe("POST /", () => {
+    it("returns 404 when no save is found", async () => {
+      vi.mocked(prisma.gameState.findUnique).mockResolvedValueOnce(null);
+      const res = await post("");
+      expect(res.status).toBe(404);
+    });
+
+    it("returns 400 when not eligible (not enough gold)", async () => {
+      const state = makeState({ player: { discordId: DISCORD_ID, username: "u", discriminator: "0", avatar: null, totalGoldEarned: 0, totalClicks: 0, characterName: "T" } });
+      vi.mocked(prisma.gameState.findUnique).mockResolvedValueOnce({ state } as never);
+      const res = await post("");
+      expect(res.status).toBe(400);
+    });
+
+    it("returns runestones on successful prestige", async () => {
+      const state = makeState();
+      vi.mocked(prisma.gameState.findUnique).mockResolvedValueOnce({ state } as never);
+      vi.mocked(prisma.gameState.update).mockResolvedValueOnce({} as never);
+      vi.mocked(prisma.player.update).mockResolvedValueOnce({} as never);
+      const res = await post("");
+      expect(res.status).toBe(200);
+      const body = await res.json() as { runestones: number; newPrestigeCount: number };
+      expect(body.newPrestigeCount).toBe(1);
+      expect(body.runestones).toBeGreaterThanOrEqual(0);
+    });
+
+    it("updates daily challenge progress when dailyChallenges are set", async () => {
+      const state = makeState({
+        dailyChallenges: {
+          date: "2024-01-01",
+          challenges: [{ id: "prestige_challenge", type: "prestige", target: 2, progress: 0, completed: false, crystalReward: 5 }],
+        } as GameState["dailyChallenges"],
+      });
+      vi.mocked(prisma.gameState.findUnique).mockResolvedValueOnce({ state } as never);
+      vi.mocked(prisma.gameState.update).mockResolvedValueOnce({} as never);
+      vi.mocked(prisma.player.update).mockResolvedValueOnce({} as never);
+      const res = await post("");
+      expect(res.status).toBe(200);
+      const body = await res.json() as { runestones: number; newPrestigeCount: number };
+      expect(body.newPrestigeCount).toBe(1);
+    });
+  });
+
+  describe("POST /buy-upgrade", () => {
+    it("returns 400 when upgradeId is missing", async () => {
+      const res = await post("/buy-upgrade", {});
+      expect(res.status).toBe(400);
+    });
+
+    it("returns 404 for unknown upgrade", async () => {
+      const res = await post("/buy-upgrade", { upgradeId: "nonexistent_upgrade" });
+      expect(res.status).toBe(404);
+    });
+
+    it("returns 404 when no save is found", async () => {
+      vi.mocked(prisma.gameState.findUnique).mockResolvedValueOnce(null);
+      const res = await post("/buy-upgrade", { upgradeId: "income_1" });
+      expect(res.status).toBe(404);
+    });
+
+    it("returns 400 when upgrade is already purchased", async () => {
+      const state = makeState({ prestige: { count: 0, runestones: 100, productionMultiplier: 1, purchasedUpgradeIds: ["income_1"] } });
+      vi.mocked(prisma.gameState.findUnique).mockResolvedValueOnce({ state } as never);
+      const res = await post("/buy-upgrade", { upgradeId: "income_1" });
+      expect(res.status).toBe(400);
+    });
+
+    it("returns 400 when not enough runestones", async () => {
+      const state = makeState({ prestige: { count: 0, runestones: 0, productionMultiplier: 1, purchasedUpgradeIds: [] } });
+      vi.mocked(prisma.gameState.findUnique).mockResolvedValueOnce({ state } as never);
+      // income_1 costs 10 runestones but state has 0
+      const res = await post("/buy-upgrade", { upgradeId: "income_1" });
+      expect(res.status).toBe(400);
+    });
+
+    it("returns updated multipliers on successful purchase", async () => {
+      const state = makeState({ prestige: { count: 0, runestones: 100, productionMultiplier: 1, purchasedUpgradeIds: [] } });
+      vi.mocked(prisma.gameState.findUnique).mockResolvedValueOnce({ state } as never);
+      vi.mocked(prisma.gameState.update).mockResolvedValueOnce({} as never);
+      const res = await post("/buy-upgrade", { upgradeId: "income_1" });
+      expect(res.status).toBe(200);
+      const body = await res.json() as { runestonesRemaining: number; purchasedUpgradeIds: string[] };
+      expect(body.runestonesRemaining).toBe(90); // 100 - 10
+      expect(body.purchasedUpgradeIds).toContain("income_1");
+    });
+  });
+});