def METHOD_NAME():
    '''Test the all_read_accesses() method.'''
    all_read_accesses = AccessType.all_read_accesses()
    assert isinstance(all_read_accesses, list)
    assert len(all_read_accesses) == 4
    assert (len(all_read_accesses) ==
            len(set(all_read_accesses)))
    assert all(isinstance(read_access, AccessType)
               for read_access in all_read_accesses)