test(admin): add unit tests for AdminController with mocked dependencies

backend/src/admin/admin.controller.spec.ts

@@ -0,0 +1,62 @@
+jest.mock("uuid", () => ({
+	v4: jest.fn(() => "mocked-uuid"),
+}));
+
+jest.mock("@noble/post-quantum/ml-kem.js", () => ({
+	ml_kem768: {
+		keygen: jest.fn(),
+		encapsulate: jest.fn(),
+		decapsulate: jest.fn(),
+	},
+}));
+
+jest.mock("jose", () => ({
+	SignJWT: jest.fn().mockReturnValue({
+		setProtectedHeader: jest.fn().mockReturnThis(),
+		setIssuedAt: jest.fn().mockReturnThis(),
+		setExpirationTime: jest.fn().mockReturnThis(),
+		sign: jest.fn().mockResolvedValue("mocked-jwt"),
+	}),
+	jwtVerify: jest.fn(),
+}));
+
+import { Test, TestingModule } from "@nestjs/testing";
+import { AuthGuard } from "../auth/guards/auth.guard";
+import { RolesGuard } from "../auth/guards/roles.guard";
+import { AdminController } from "./admin.controller";
+import { AdminService } from "./admin.service";
+
+describe("AdminController", () => {
+	let controller: AdminController;
+	let service: AdminService;
+
+	const mockAdminService = {
+		getStats: jest.fn(),
+	};
+
+	beforeEach(async () => {
+		const module: TestingModule = await Test.createTestingModule({
+			controllers: [AdminController],
+			providers: [{ provide: AdminService, useValue: mockAdminService }],
+		})
+			.overrideGuard(AuthGuard)
+			.useValue({ canActivate: () => true })
+			.overrideGuard(RolesGuard)
+			.useValue({ canActivate: () => true })
+			.compile();
+
+		controller = module.get<AdminController>(AdminController);
+		service = module.get<AdminService>(AdminService);
+	});
+
+	it("should be defined", () => {
+		expect(controller).toBeDefined();
+	});
+
+	describe("getStats", () => {
+		it("should call service.getStats", async () => {
+			await controller.getStats();
+			expect(service.getStats).toHaveBeenCalled();
+		});
+	});
+});