public void testMergeAttributesWithNullOverrideGroup() {
    char[] mode = new char[10];
    Arrays.fill(mode, (char) 0);

    FileAttributes override = new FileAttributes(1001, "myUser", -1, null, mode);
    FileAttributes defaults = new FileAttributes(1000, "defaultUser", 1000, "defaultGroup", mode);

    PlexusIoResourceAttributes attributes =
        PlexusIoResourceAttributeUtils.mergeAttributes(override, null, defaults);

    assertEquals(new Integer(1000), attributes.getGroupId());
    assertEquals(new Integer(1001), attributes.getUserId());
  }