s = "foo"; s += "bar"
assert(s == "foobar")
assert( 1 + 2 * 3 == 7)
assert((1 + 2)* 3 == 9)
assert(42 % 40.0 == 2)
assert("'\"'" == '\'"\'')
assert("testing" == "test" + "ing")

## Lists test.
l1 = [1, false, null, func print('hello') end]
assert(is_null(l1[2]))
l1[1] = true; assert(l1[1])

## Builtin functions tests.
assert(to_string(42) == '42')

## Core module test.
import math
h1 = math.hash("testing"); h2 = math.hash("test" + "ing")
assert(h1 == h2)
assert(math.ceil(1.1) == math.floor(2.9))

## Logical statement test
val = 0; a = false; b = true
get_true = func return true end
if a and b then assert(false) end
if a or b then val = 42 else assert(false) end assert(val == 42)
if get_true() or false then val = 12 end assert(val == 12)

## Recursive to_string list/map
l = [1]
list_append(l, l)
assert(to_string(l) == '[1, [...]]')
m = {}
m['m'] = m
assert(to_string(m) == '{"m":{...}}')