import { describe, it, expect } from "vitest";
import { splitGrossCents } from "@/src/modules/zahlungen/lib/invoice-tax";

describe("splitGrossCents", () => {
  it("rechnet 19 % aus einem Endpreis heraus", () => {
    // 29,00 € brutto = 24,37 € netto + 4,63 € USt
    expect(splitGrossCents(2900, 19)).toEqual({ netCents: 2437, taxCents: 463 });
  });

  it("rechnet 7 % heraus", () => {
    expect(splitGrossCents(2900, 7)).toEqual({ netCents: 2710, taxCents: 190 });
  });

  it("ergibt immer exakt den Bruttobetrag", () => {
    for (const gross of [1, 99, 1250, 1999, 25000]) {
      const { netCents, taxCents } = splitGrossCents(gross, 19);
      expect(netCents + taxCents).toBe(gross);
    }
  });
});