print("\n--- Test: os basic ---");

import os;

var cwd = os.getcwd();
assert(type(cwd) == "string", "getcwd returns string");

var pid = os.getpid();
assert(type(pid) == "number", "getpid returns number");

var nm = os.name();
assert(type(nm) == "string", "name returns string");

var sep = os.sep();
var psep = os.pathsep();
var lsep = os.linesep();
assert(type(sep) == "string" && type(psep) == "string" && type(lsep) == "string", "separators are strings");

// listdir should return array
var listing = os.listdir(".");
assert(type(listing) == "array", "listdir returns array");

// exists/isdir should be true for current dir
assert(os.exists(".") == true, "exists(.) is true");
assert(os.isdir(".") == true, "isdir(.) is true");

print("os basic: PASS");