public static int getAccessRightsForUserGroup(int uid, int gid,
      int[] auxGids, Nfs3FileAttributes attr) {
    int mode = attr.getMode();
    if (uid == attr.getUid()) {
      return getAccessRights(mode >> 6, attr.getType());
    }
    if (gid == attr.getGid()) {
      return getAccessRights(mode >> 3, attr.getType());
    }
    // Check for membership in auxiliary groups
    if (auxGids != null) {
      for (int auxGid : auxGids) {
        if (attr.getGid() == auxGid) {
          return getAccessRights(mode >> 3, attr.getType());
        }
      }
    }
    return getAccessRights(mode, attr.getType());
  }
@Test
  public void testGetAccessRightsForUserGroup() throws IOException {
    Nfs3FileAttributes attr = Mockito.mock(Nfs3FileAttributes.class);
    Mockito.when(attr.getUid()).thenReturn(2);
    Mockito.when(attr.getGid()).thenReturn(3);
    Mockito.when(attr.getMode()).thenReturn(448); // 700
    Mockito.when(attr.getType()).thenReturn(NfsFileType.NFSREG.toValue());
    assertEquals("No access should be allowed as UID does not match attribute over mode 700",
      0, Nfs3Utils.getAccessRightsForUserGroup(3, 3, null, attr));
    Mockito.when(attr.getUid()).thenReturn(2);
    Mockito.when(attr.getGid()).thenReturn(3);
    Mockito.when(attr.getMode()).thenReturn(56); // 070
    Mockito.when(attr.getType()).thenReturn(NfsFileType.NFSREG.toValue());
    assertEquals("No access should be allowed as GID does not match attribute over mode 070",
      0, Nfs3Utils.getAccessRightsForUserGroup(2, 4, null, attr));
    Mockito.when(attr.getUid()).thenReturn(2);
    Mockito.when(attr.getGid()).thenReturn(3);
    Mockito.when(attr.getMode()).thenReturn(7); // 007
    Mockito.when(attr.getType()).thenReturn(NfsFileType.NFSREG.toValue());
    assertEquals("Access should be allowed as mode is 007 and UID/GID do not match",
      61 /* RWX */, Nfs3Utils.getAccessRightsForUserGroup(1, 4, new int[] {5, 6}, attr));
    Mockito.when(attr.getUid()).thenReturn(2);
    Mockito.when(attr.getGid()).thenReturn(10);
    Mockito.when(attr.getMode()).thenReturn(288); // 440
    Mockito.when(attr.getType()).thenReturn(NfsFileType.NFSREG.toValue());
    assertEquals("Access should be allowed as mode is 440 and Aux GID does match",
      1 /* R */, Nfs3Utils.getAccessRightsForUserGroup(3, 4, new int[] {5, 16, 10}, attr));
    Mockito.when(attr.getUid()).thenReturn(2);
    Mockito.when(attr.getGid()).thenReturn(10);
    Mockito.when(attr.getMode()).thenReturn(448); // 700
    Mockito.when(attr.getType()).thenReturn(NfsFileType.NFSDIR.toValue());
    assertEquals("Access should be allowed for dir as mode is 700 and UID does match",
      31 /* Lookup */, Nfs3Utils.getAccessRightsForUserGroup(2, 4, new int[] {5, 16, 10}, attr));
    assertEquals("No access should be allowed for dir as mode is 700 even though GID does match",
      0, Nfs3Utils.getAccessRightsForUserGroup(3, 10, new int[] {5, 16, 4}, attr));
    assertEquals("No access should be allowed for dir as mode is 700 even though AuxGID does match",
      0, Nfs3Utils.getAccessRightsForUserGroup(3, 20, new int[] {5, 10}, attr));
    
    Mockito.when(attr.getUid()).thenReturn(2);
    Mockito.when(attr.getGid()).thenReturn(10);
    Mockito.when(attr.getMode()).thenReturn(457); // 711
    Mockito.when(attr.getType()).thenReturn(NfsFileType.NFSDIR.toValue());
    assertEquals("Access should be allowed for dir as mode is 711 and GID matches",
        2 /* Lookup */, Nfs3Utils.getAccessRightsForUserGroup(3, 10, new int[] {5, 16, 11}, attr));
  }