text: import { assert } from 'chai';
  import { testOptional } from '../extensions/index.js';
  import isMAC48Address from '../src/st-mac-address.js';
  
  it.optional = testOptional;
  
  Object.freeze(assert);
  
  describe('st-mac-address', () => {
    it.optional('should check if a given string corresponds to MAC-48 address or not', () => {
      assert.strictEqual(isMAC48Address('00-1B-63-84-45-E6'), true);
      assert.strictEqual(isMAC48Address('Z1-1B-63-84-45-E6'), false);
      assert.strictEqual(isMAC48Address('not a MAC-48 address'), false);
      assert.strictEqual(isMAC48Address('FF-FF-FF-FF-FF-FF'), true);
      assert.strictEqual(isMAC48Address('G0-00-00-00-00-00'), false);
    });
  });
  