def test_arithmetic_on_small_array_from_file(file):
 s = symbol('s', discover(file))
 assert eq(compute((s.x + 1), file), (x + 1))

def test_arithmetic_on_small_array_from_file ( file ) : s = symbol ( 's' , discover ( file ) ) assert eq ( compute ( ( s . x + 1 ) , file ) , ( x + 1 ) )
want to make sure that we call pre_compute on dataset even when its not the leaf data input .