edr-platform/apps/edr-freight-api/src/modules/payment-settings/djf-currency-switch.spec.ts

import { ManualPaymentSettingsService } from "./manual-payment-settings.service";
import type { ManualPaymentSetting } from "./entities/manual-payment-setting.entity";

/** Single-row repository stub: enough for get/update, nothing more. */
const repoWith = (row: Partial<ManualPaymentSetting>) => {
  const stored = { id: "settings-1", ...row } as ManualPaymentSetting;
  return {
    findOne: async () => stored,
    create: (v: Partial<ManualPaymentSetting>) => v as ManualPaymentSetting,
    save: async (v: ManualPaymentSetting) => v,
    update: async (_id: string, patch: Partial<ManualPaymentSetting>) => {
      Object.assign(stored, patch);
    },
  };
};

const serviceWith = (row: Partial<ManualPaymentSetting>) =>
  new ManualPaymentSettingsService(repoWith(row) as never);

describe("DJF currency switch", () => {
  it("offers DJF, and accepts it, while the switch is on", async () => {
    const service = serviceWith({ djfPaymentsEnabled: true });

    await expect(service.offeredCurrencies()).resolves.toEqual([
      "ETB",
      "USD",
      "DJF",
    ]);
    await expect(service.isCurrencyOffered("DJF")).resolves.toBe(true);
  });

  it("drops DJF from the offered currencies once switched off", async () => {
    const service = serviceWith({ djfPaymentsEnabled: false });

    await expect(service.offeredCurrencies()).resolves.toEqual(["ETB", "USD"]);
    await expect(service.isCurrencyOffered("djf")).resolves.toBe(false);
  });

  it("never switches off ETB or USD — only DJF has a currency-level switch", async () => {
    const service = serviceWith({ djfPaymentsEnabled: false });

    await expect(service.isCurrencyOffered("ETB")).resolves.toBe(true);
    await expect(service.isCurrencyOffered("USD")).resolves.toBe(true);
  });

  it("leaves the manual rail alone when the currency switch flips", async () => {
    const service = serviceWith({ djfEnabled: true, djfPaymentsEnabled: true });

    const updated = await service.update({ djfPaymentsEnabled: false }, "user-1");

    expect(updated.djfPaymentsEnabled).toBe(false);
    // Existing DJF invoices stay hand-settleable, so nothing is stranded.
    expect(updated.djfEnabled).toBe(true);
    await expect(service.isEnabled("DJF")).resolves.toBe(true);
  });
});