diff --git a/server/test/unit/services/inviteService.test.ts b/server/test/unit/services/inviteService.test.ts
new file mode 100644
index 000000000..da29d1834
--- /dev/null
+++ b/server/test/unit/services/inviteService.test.ts
@@ -0,0 +1,166 @@
+import { describe, expect, it, jest } from "@jest/globals";
+import { InviteService } from "../../../src/service/business/inviteService.ts";
+import type { Invite, UserRole } from "../../../src/types/index.ts";
+
+// ── Helpers ──────────────────────────────────────────────────────────────────
+
+const makeInvite = (overrides?: Partial<Invite>): Invite => ({
+	id: "inv-1",
+	email: "invited@example.com",
+	teamId: "team-1",
+	role: ["user"] as UserRole[],
+	token: "invite-token-123",
+	expiry: "2026-12-31T00:00:00Z",
+	createdAt: "2026-01-01T00:00:00Z",
+	updatedAt: "2026-01-01T00:00:00Z",
+	...overrides,
+});
+
+const createService = (overrides?: Record<string, unknown>) => {
+	const invitesRepository = {
+		create: jest.fn().mockResolvedValue(makeInvite()),
+		findByToken: jest.fn().mockResolvedValue(makeInvite()),
+	};
+	const settingsService = {
+		getSettings: jest.fn().mockReturnValue({ clientHost: "http://localhost:5173" }),
+	};
+	const emailService = {
+		buildEmail: jest.fn().mockResolvedValue("<html>Invite</html>"),
+		sendEmail: jest.fn().mockResolvedValue("msg-id-123"),
+	};
+
+	const defaults = { invitesRepository, settingsService, emailService, ...overrides };
+
+	const service = new InviteService(defaults as any);
+	return { service, ...defaults };
+};
+
+// ── Tests ────────────────────────────────────────────────────────────────────
+
+describe("InviteService", () => {
+	describe("serviceName", () => {
+		it("returns inviteService from static property", () => {
+			expect(InviteService.SERVICE_NAME).toBe("inviteService");
+		});
+
+		it("returns inviteService from instance getter", () => {
+			const { service } = createService();
+			expect(service.serviceName).toBe("inviteService");
+		});
+	});
+
+	// ── getInviteToken ──────────────────────────────────────────────────────
+
+	describe("getInviteToken", () => {
+		it("creates an invite with teamId assigned", async () => {
+			const { service, invitesRepository } = createService();
+			const invite: Partial<Invite> = { email: "new@example.com", role: ["user"] };
+
+			const result = await service.getInviteToken({ invite, teamId: "team-1", userRoles: ["superadmin"] });
+
+			expect(invitesRepository.create).toHaveBeenCalledWith(expect.objectContaining({ email: "new@example.com", teamId: "team-1" }));
+			expect(result).toEqual(makeInvite());
+		});
+
+		it("allows creation when role is undefined (defaults to empty)", async () => {
+			const { service } = createService();
+
+			const result = await service.getInviteToken({ invite: { email: "new@example.com" }, teamId: "team-1", userRoles: ["user"] });
+
+			expect(result).toEqual(makeInvite());
+		});
+
+		it("throws 403 when actor cannot manage the target role", async () => {
+			const { service } = createService();
+
+			await expect(service.getInviteToken({ invite: { role: ["superadmin"] }, teamId: "team-1", userRoles: ["admin"] })).rejects.toThrow(
+				"You do not have permission to create this invite"
+			);
+		});
+	});
+
+	// ── sendInviteEmail ─────────────────────────────────────────────────────
+
+	describe("sendInviteEmail", () => {
+		it("creates invite, builds email, and sends it", async () => {
+			const { service, invitesRepository, emailService, settingsService } = createService();
+
+			await service.sendInviteEmail({
+				invite: { email: "new@example.com", role: ["user"] },
+				firstName: "Test",
+				userRoles: ["superadmin"],
+			});
+
+			expect(invitesRepository.create).toHaveBeenCalledWith(expect.objectContaining({ email: "new@example.com" }));
+			expect(settingsService.getSettings).toHaveBeenCalled();
+			expect(emailService.buildEmail).toHaveBeenCalledWith("employeeActivationTemplate", {
+				name: "Test",
+				link: "http://localhost:5173/register/invite-token-123",
+			});
+			expect(emailService.sendEmail).toHaveBeenCalledWith("new@example.com", "Welcome to Uptime Monitor", "<html>Invite</html>");
+		});
+
+		it("throws 400 when invite email is missing", async () => {
+			const { service } = createService();
+
+			await expect(service.sendInviteEmail({ invite: {}, firstName: "Test", userRoles: ["superadmin"] })).rejects.toThrow(
+				"Invite email is required to send an invite"
+			);
+		});
+
+		it("throws 403 when actor cannot manage the target role", async () => {
+			const { service } = createService();
+
+			await expect(
+				service.sendInviteEmail({ invite: { email: "new@example.com", role: ["superadmin"] }, firstName: "Test", userRoles: ["admin"] })
+			).rejects.toThrow("You do not have permission to create this invite");
+		});
+
+		it("allows sending when role is undefined (defaults to empty)", async () => {
+			const { service, emailService } = createService();
+
+			await service.sendInviteEmail({ invite: { email: "new@example.com" }, firstName: "Test", userRoles: ["user"] });
+
+			expect(emailService.sendEmail).toHaveBeenCalled();
+		});
+
+		it("throws 500 when buildEmail returns falsy", async () => {
+			const { service } = createService({
+				emailService: {
+					buildEmail: jest.fn().mockResolvedValue(null),
+					sendEmail: jest.fn(),
+				},
+			});
+
+			await expect(
+				service.sendInviteEmail({ invite: { email: "new@example.com", role: ["user"] }, firstName: "Test", userRoles: ["superadmin"] })
+			).rejects.toThrow("Failed to build invite e-mail");
+		});
+
+		it("throws 500 when sendEmail returns falsy", async () => {
+			const { service } = createService({
+				emailService: {
+					buildEmail: jest.fn().mockResolvedValue("<html>ok</html>"),
+					sendEmail: jest.fn().mockResolvedValue(false),
+				},
+			});
+
+			await expect(
+				service.sendInviteEmail({ invite: { email: "new@example.com", role: ["user"] }, firstName: "Test", userRoles: ["superadmin"] })
+			).rejects.toThrow("Failed to send invite e-mail");
+		});
+	});
+
+	// ── verifyInviteToken ───────────────────────────────────────────────────
+
+	describe("verifyInviteToken", () => {
+		it("delegates to repository", async () => {
+			const { service, invitesRepository } = createService();
+
+			const result = await service.verifyInviteToken({ inviteToken: "invite-token-123" });
+
+			expect(invitesRepository.findByToken).toHaveBeenCalledWith("invite-token-123");
+			expect(result).toEqual(makeInvite());
+		});
+	});
+});