1  use <util/sum.scad>
 2  
 3  module test_sum() {
 4      echo("==== test_sum ====");
 5      
 6      assert(sum([1, 2, 3, 4, 5]) == 15);
 7      assert(sum([[1, 2, 3], [4, 5, 6]]) == [5, 7, 9]);
 8  }
 9  
10  test_sum();