import { amountsMatchToTheCent } from "./cbe-bill.service";

describe("amountsMatchToTheCent (CBE payment amount gate)", () => {
  it("accepts the exact amount", () => {
    expect(amountsMatchToTheCent(1234.34, 1234.34)).toBe(true);
  });

  it("rejects a cents-only difference (the 1234.89 vs 1234.34 bug)", () => {
    expect(amountsMatchToTheCent(1234.89, 1234.34)).toBe(false);
    expect(amountsMatchToTheCent(1234.35, 1234.34)).toBe(false);
  });

  it("rejects whole-unit differences", () => {
    expect(amountsMatchToTheCent(1235.34, 1234.34)).toBe(false);
  });

  it("absorbs double-precision storage noise", () => {
    expect(amountsMatchToTheCent(1234.34, 1234.3399999999999)).toBe(true);
    // classic float artifact: 0.1 + 0.2 !== 0.3
    expect(amountsMatchToTheCent(0.1 + 0.2, 0.3)).toBe(true);
  });
});