anchor.diff:      test('Pass invalid Uuid to constructor', () {
         const INVALID_UUID = 'For sure not a valid UUID';
         expect(Uuid.isValidUUID(fromString: INVALID_UUID), false);
  -      expect(() => UuidValue(INVALID_UUID, true), throwsA(isA<FormatException>()));
  +      expect(
  +          () => UuidValue(INVALID_UUID, true), throwsA(isA<FormatException>()));
   
         final uuidval = UuidValue(INVALID_UUID, false);
         expect(uuidval.uuid, INVALID_UUID.toLowerCase());
  
positive.code:       var uidt = uuid.v6(options: {'mSecs': TIME});
        var uidtb = uuid.v6(options: {'mSecs': TIME - 1});
  
        expect((int.parse("0x${uidtb.split('-')[3]}") - int.parse("0x${uidt.split('-')[3]}")),
            anyOf(equals(1), equals(-16383)));
      });
  
  
negative.code: 
    group('[Version 6 Tests]', () {
      test('IDs created at same mSec are different', () {
        expect(uuid.v6(options: {'mSecs': TIME}),
            isNot(equals(uuid.v6(options: {'mSecs': TIME}))));
      });
  
      test('Exception thrown when > 10K ids created in 1 ms', () {
  