tests: add coverage for src/actions/ (15 files) and src/lib/{admin,auth} (3 files)

- src/actions coverage: 2.4% -> 13.55%
- src/lib/admin coverage: 44.3% -> 84.81%
- src/lib/auth coverage: 90.52%
- vitest.config.ts: exclude .next.prev/ from test discovery

src/actions/admin-help.test.ts

@@ -0,0 +1,81 @@
+import { revalidatePath } from "next/cache";
+import { redirect } from "next/navigation";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { requirePermission } from "@/lib/admin/guard";
+import { PERMS } from "@/lib/permissions";
+import { prisma } from "@/lib/prisma";
+import { logStaffActivity } from "@/lib/services/staff-activity";
+import {
+	createHelpQuestion,
+	deleteHelpQuestion,
+	updateHelpQuestion,
+} from "./admin-help";
+
+vi.mock("@/lib/admin/guard", () => ({ requirePermission: vi.fn() }));
+vi.mock("@/lib/permissions", () => ({ PERMS: { PAGES_EDIT: "pages.edit" } }));
+vi.mock("@/lib/prisma", () => ({
+	prisma: {
+		websiteHelpCenterCategories: {
+			create: vi.fn(),
+			update: vi.fn(),
+			delete: vi.fn(),
+		},
+	},
+}));
+vi.mock("@/lib/services/staff-activity", () => ({ logStaffActivity: vi.fn() }));
+vi.mock("next/cache", () => ({ revalidatePath: vi.fn() }));
+vi.mock("next/navigation", () => ({ redirect: vi.fn() }));
+
+const staff = { id: 1, rank: 7, username: "admin" };
+const fakeForm = (data: Record<string, string | null>) => ({
+	get: (key: string) => (key in data ? data[key] : null),
+});
+
+beforeEach(() => {
+	vi.clearAllMocks();
+	vi.mocked(requirePermission).mockResolvedValue(staff as never);
+});
+
+describe("createHelpQuestion", () => {
+	it("creates a help question and redirects", async () => {
+		vi.mocked(prisma.websiteHelpCenterCategories.create).mockResolvedValue({
+			id: BigInt(5),
+		} as never);
+		await createHelpQuestion(
+			fakeForm({
+				name: "FAQ",
+				content: "<p>Answer</p>",
+			}) as unknown as FormData,
+		);
+		expect(prisma.websiteHelpCenterCategories.create).toHaveBeenCalled();
+		expect(redirect).toHaveBeenCalledWith("/admin/help-questions");
+	});
+});
+
+describe("updateHelpQuestion", () => {
+	it("updates and redirects", async () => {
+		vi.mocked(prisma.websiteHelpCenterCategories.update).mockResolvedValue(
+			{} as never,
+		);
+		await updateHelpQuestion(
+			fakeForm({
+				id: "42",
+				name: "Updated",
+				content: "New",
+			}) as unknown as FormData,
+		);
+		expect(prisma.websiteHelpCenterCategories.update).toHaveBeenCalled();
+		expect(redirect).toHaveBeenCalledWith("/admin/help-questions");
+	});
+});
+
+describe("deleteHelpQuestion", () => {
+	it("deletes and redirects", async () => {
+		vi.mocked(prisma.websiteHelpCenterCategories.delete).mockResolvedValue(
+			{} as never,
+		);
+		await deleteHelpQuestion(fakeForm({ id: "42" }) as unknown as FormData);
+		expect(prisma.websiteHelpCenterCategories.delete).toHaveBeenCalled();
+		expect(redirect).toHaveBeenCalledWith("/admin/help-questions");
+	});
+});