if (!_isWindows()) {
    // note that normal program exit returns 0
    assert.eq(0, runProgram("true"));
    assert.neq(0, runProgram("false"));
    assert.neq(0, runProgram("this_program_doesnt_exit"));

    // verify output visually
    runProgram("echo", "Hello", "World.", "How   are   you?");
    runProgram("bash", "-c", 'echo Hello     World. "How   are   you?"'); // only one space is
    // printed between Hello
    // and World

    // numbers can be passed as numbers or strings
    runProgram("sleep", 0.5);
    runProgram("sleep", "0.5");
} else {
    runProgram("cmd", "/c", "echo hello windows");
}