src/test/ui/env-args-reverse-iterator.rs

   1 // run-pass
   2 // ignore-emscripten no processes
   3 // ignore-sgx no processes
   4
   5 use std::env::args;
   6 use std::process::Command;
   7
   8 fn assert_reverse_iterator_for_program_arguments(program_name: &str) {
   9     let args: Vec<_> = args().rev().collect();
  10
  11     assert!(args.len() == 4);
  12     assert_eq!(args[0], "c");
  13     assert_eq!(args[1], "b");
  14     assert_eq!(args[2], "a");
  15     assert_eq!(args[3], program_name);
  16
  17     println!("passed");
  18 }
  19
  20 fn main() {
  21     let mut args = args();
  22     let me = args.next().unwrap();
  23
  24     if let Some(_) = args.next() {
  25         assert_reverse_iterator_for_program_arguments(&me);
  26         return
  27     }
  28
  29     let output = Command::new(&me)
  30         .arg("a")
  31         .arg("b")
  32         .arg("c")
  33         .output()
  34         .unwrap();
  35     assert!(output.status.success());
  36     assert!(output.stderr.is_empty());
  37     assert_eq!(output.stdout, b"passed\n");
  38 }