anchor.diff:      test('Pass invalid Uuid to constructor', () {
         const invalidUUID = 'For sure not a valid UUID';
         expect(Uuid.isValidUUID(fromString: invalidUUID), false);
  -      expect(() => UuidValue(invalidUUID, true), throwsA(isA<FormatException>()));
  +      expect(
  +          () => UuidValue(invalidUUID, true), throwsA(isA<FormatException>()));
   
         final uuidval = UuidValue(invalidUUID, false);
         expect(uuidval.uuid, invalidUUID.toLowerCase());
  
positive.code:         test(testCase.key, () {
            var nodeId = <int>[0x9E, 0x6B, 0xDE, 0xCE, 0xD8, 0x46];
            var clockSeq = (0xB3 << 8 | 0xC8) & 0x3ffff;
            final uuid =
                Uuid().v6(options: {'mSecs': testCase.value[0], 'nSecs': 0, 'node': nodeId, 'clockSeq': clockSeq});
            expect(uuid.toUpperCase(), equals(testCase.value[1]));
          });
        }
  
negative.code:       var uidt = uuid.v1(options: {'mSecs': testTime});
        var uidtb = uuid.v1(options: {'mSecs': testTime - 1});
  
        expect(
            (int.parse("0x${uidtb.split('-')[3]}") -
                int.parse("0x${uidt.split('-')[3]}")),
            anyOf(equals(1), equals(-16383)));
      });
  
  