@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));
}