def METHOD_NAME(test_set, exp_intersect, exp_case):
    """
   Test CaseInsensitiveFrozenSet for correct intersection
   """
    from masci_tools.util.case_insensitive_dict import CaseInsensitiveFrozenSet
    s = CaseInsensitiveFrozenSet(TEST_INIT)
    actual = s.intersection(test_set)
    print(actual.original_case)
    assert isinstance(actual, CaseInsensitiveFrozenSet)
    assert actual == exp_intersect
    assert s & test_set == actual
    assert actual.original_case == exp_case