[test-add '[0 . ""] [popen "true"]]
[test-add #f [zero? [car [popen "false"]]]]
[test-add '[0 . "testerle\n"] [popen "echo testerle"]]
[test-add '[0 . ""] [popen "true"]]
[test-add #f [zero? [car [popen "false"]]]]
[test-add '[0 . "testerle\n"] [popen "echo testerle"]]