#!/usr/bin/ruby

var x = 3
var y = 4

assert_eq(-x, -3)
assert_eq(-y, -4)
assert_eq(+(3)-4, -1)
assert_eq(-(x)-y, -7)
assert_eq(-(x)-(4), -7)
assert_eq([-(3)+4], [1])
assert_eq([-(3)-4], [-7])
assert_eq(@(1..9)-[3,5], [1,2,4,6,7,8,9])

say "** Test passed!"