@Test
  public void testConstructor2() {
    final GMSMemberData memberData =
        new GMSMemberData(mock(InetAddress.class), 0, unknownVersionOrdinal, 0, 0, 0);
    validate(memberData);
  }
MemberData has to be able to hold an unknown version ordinal since, during a rolling upgrade,
we may receive a MemberData from a member running a future version of the product.
geode-membership/src/integrationTest/java/org/apache/geode/distributed/internal/membership/gms/GMSMemberDataVersionJUnitTest.java