def test_filter_int_1(): assert utils.filter_int(2) == 2
def test_filter_int_5(): assert utils.filter_int([1, 2]) == ''
def test_filter_int_3(): assert utils.filter_int(set()) == ''
def test_filter_int_4(): assert utils.filter_int({}) == ''
def test_filter_int_2(): assert utils.filter_int('a') == ''