text: const expect = require('chai').expect;
  const { verifyPZN } = require('../src/medchecksum');
  
  it('should check a given PZN for validity', function(done) {
      const validPzns = ['04877800', '9230807', '00262467'];
      const invalidPzns = ['1234', '72731923', 'a00262467'];
  
      validPzns.forEach((pzn) => {
        expect(verifyPZN(pzn)).to.be.true;
      });
      invalidPzns.forEach((pzn) => {
        expect(verifyPZN(pzn)).to.be.false;
      });
      done();
  });