index.test.ts

import validate from "./index";

test("Should be valid GTIN-8", () => {
  const VALIDS: string[] = ["12345670", "96385074", "75395124"];
  VALIDS.forEach((gtin: string) => expect(validate(gtin)).toBe(true));
});

test("Should be valid GTIN-12", () => {
  const VALIDS: string[] = ["012345678905", "036000291452", "123456789012"];
  VALIDS.forEach((gtin: string) => expect(validate(gtin)).toBe(true));
});

test("Should be invalid GTIN-8", () => {
  const INVALIDS: string[] = ["1234567", "abcdefgh", "87654321"];
  INVALIDS.forEach((gtin: string) => expect(validate(gtin)).toBe(false));
});

test("Should be invalid GTIN-12", () => {
  const INVALIDS: string[] = ["01234567890", "03600029145", "999999999999"];
  INVALIDS.forEach((gtin: string) => expect(validate(gtin)).toBe(false));
});

test("Should handle empty strings", () => {
  expect(validate("")).toBe(false);
});

test("Should handle null or undefined values", () => {
  expect(validate(null as any)).toBe(false);
  expect(validate(undefined as any)).toBe(false);
});