Kuma/tests/lib/stripe-fee.test.ts

import { describe, it, expect, vi, beforeEach } from "vitest";

vi.mock("@/src/lib/stripe", () => ({
  stripe: {
    paymentIntents: { retrieve: vi.fn() },
    balanceTransactions: { retrieve: vi.fn() },
  },
}));

vi.mock("@/src/lib/prisma", () => ({
  prisma: { courseBooking: { updateMany: vi.fn(), count: vi.fn() } },
}));

import {
  recordStripeFee,
  recordStripeFeeForCharge,
  stripeProcessingFeeCents,
} from "@/src/lib/stripe-fee";
import { stripe } from "@/src/lib/stripe";
import { prisma } from "@/src/lib/prisma";

// Echte Form vom Test-Account: fee=171 enthält BEIDE Abzüge.
const balanceTransaction = {
  fee: 171,
  fee_details: [
    { type: "stripe_fee", amount: 121 },
    { type: "application_fee", amount: 50 },
  ],
};

beforeEach(() => {
  vi.clearAllMocks();
  vi.mocked(prisma.courseBooking.updateMany).mockResolvedValue({ count: 1 } as never);
});

describe("stripeProcessingFeeCents", () => {
  it("zählt unsere application_fee nicht als Stripe-Gebühr", () => {
    // Mit bt.fee stünden hier 171 - 50 Cent zu viel im Zahlungen-Tab.
    expect(stripeProcessingFeeCents(balanceTransaction as never)).toBe(121);
  });

  it("rechnet weitere Stripe-Abzüge wie Steuern mit", () => {
    const withTax = {
      fee_details: [...balanceTransaction.fee_details, { type: "tax", amount: 23 }],
    };
    expect(stripeProcessingFeeCents(withTax as never)).toBe(144);
  });
});

describe("recordStripeFee", () => {
  it("liest die Gebühr auf dem Studio-Account und speichert sie nur einmal", async () => {
    vi.mocked(stripe.paymentIntents.retrieve).mockResolvedValue({
      latest_charge: { balance_transaction: balanceTransaction },
    } as never);

    await recordStripeFee("pi_1", "acct_studio");

    expect(stripe.paymentIntents.retrieve).toHaveBeenCalledWith(
      "pi_1",
      { expand: ["latest_charge.balance_transaction"] },
      { stripeAccount: "acct_studio" }
    );
    expect(prisma.courseBooking.updateMany).toHaveBeenCalledWith({
      // stripeFee: null - ein zweites Event darf den Wert nicht überschreiben.
      where: { stripePaymentIntentId: "pi_1", stripeFee: null },
      data: { stripeFee: 121 },
    });
  });

  it("tut nichts, solange Stripe die Zahlung nicht abgerechnet hat", async () => {
    vi.mocked(stripe.paymentIntents.retrieve).mockResolvedValue({
      latest_charge: { balance_transaction: null },
    } as never);

    await recordStripeFee("pi_1", "acct_studio");

    expect(prisma.courseBooking.updateMany).not.toHaveBeenCalled();
  });
});

describe("recordStripeFeeForCharge", () => {
  const charge = { payment_intent: "pi_1", balance_transaction: "txn_1" };

  it("trägt die Gebühr nach, wenn eine Buchung auf sie wartet", async () => {
    vi.mocked(prisma.courseBooking.count).mockResolvedValue(1 as never);
    vi.mocked(stripe.balanceTransactions.retrieve).mockResolvedValue(balanceTransaction as never);

    await recordStripeFeeForCharge(charge as never, "acct_studio");

    expect(stripe.balanceTransactions.retrieve).toHaveBeenCalledWith("txn_1", undefined, {
      stripeAccount: "acct_studio",
    });
    expect(prisma.courseBooking.updateMany).toHaveBeenCalledWith({
      where: { stripePaymentIntentId: "pi_1", stripeFee: null },
      data: { stripeFee: 121 },
    });
  });

  it("fragt Stripe gar nicht erst, wenn keine Buchung wartet", async () => {
    // charge.updated feuert auch bei Erstattungen - dann ist die Gebühr längst da.
    vi.mocked(prisma.courseBooking.count).mockResolvedValue(0 as never);

    await recordStripeFeeForCharge(charge as never, "acct_studio");

    expect(stripe.balanceTransactions.retrieve).not.toHaveBeenCalled();
  });

  it("ignoriert Charges ohne Abrechnung", async () => {
    await recordStripeFeeForCharge(
      { payment_intent: "pi_1", balance_transaction: null } as never,
      "acct_studio"
    );

    expect(prisma.courseBooking.count).not.toHaveBeenCalled();
  });
});