#!/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])

assert_eq([43-(-(42))], [85])
assert_eq([((43))-(-(42))], [85])
assert_eq([+(43)-(-(42))], [85])
assert_eq([(-(42))-+(43)], [-85])
assert_eq([(-(42))-(-(43))], [1])
assert_eq([(x)-(-(43))], [46])
assert_eq([(x)-(-(y))], [7])
assert_eq([-(x)-(-(y))], [1])
assert_eq([(-(x))-(-(y))], [1])
assert_eq([(-(-(3)))-(-(y))], [7])
assert_eq([(-(42))-(43)], [-85])
assert_eq([(-(42))-43], [-85])

assert_eq(-x**2, -9)
assert_eq(-(x**2), -9)
assert_eq(-(x)**2, 9)

assert_eq(-42**2, -1764)
assert_eq(-(42)**2, 1764)
assert_eq(-(42) -> pow(2), 1764)
assert_eq(-(42**2), -1764)
assert_eq(-(x+y), -7)

say "** Test passed!"