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use std::env::*;
use std::ffi::{OsStr, OsString};
use rand::distributions::Alphanumeric;
use rand::{thread_rng, Rng};
fn make_rand_name() -> OsString {
let rng = thread_rng();
let n = format!("TEST{}", rng.sample_iter(&Alphanumeric).take(10).collect::<String>());
let n = OsString::from(n);
assert!(var_os(&n).is_none());
n
}
fn eq(a: Option<OsString>, b: Option<&str>) {
assert_eq!(a.as_ref().map(|s| &**s), b.map(OsStr::new).map(|s| &*s));
}
#[test]
fn test_set_var() {
let n = make_rand_name();
set_var(&n, "VALUE");
eq(var_os(&n), Some("VALUE"));
}
#[test]
fn test_remove_var() {
let n = make_rand_name();
set_var(&n, "VALUE");
remove_var(&n);
eq(var_os(&n), None);
}
#[test]
fn test_set_var_overwrite() {
let n = make_rand_name();
set_var(&n, "1");
set_var(&n, "2");
eq(var_os(&n), Some("2"));
set_var(&n, "");
eq(var_os(&n), Some(""));
}
#[test]
#[cfg_attr(target_os = "emscripten", ignore)]
fn test_var_big() {
let mut s = "".to_string();
let mut i = 0;
while i < 100 {
s.push_str("aaaaaaaaaa");
i += 1;
}
let n = make_rand_name();
set_var(&n, &s);
eq(var_os(&n), Some(&s));
}
#[test]
#[cfg_attr(target_os = "emscripten", ignore)]
fn test_env_set_get_huge() {
let n = make_rand_name();
let s = "x".repeat(10000);
set_var(&n, &s);
eq(var_os(&n), Some(&s));
remove_var(&n);
eq(var_os(&n), None);
}
#[test]
fn test_env_set_var() {
let n = make_rand_name();
let mut e = vars_os();
set_var(&n, "VALUE");
assert!(!e.any(|(k, v)| { &*k == &*n && &*v == "VALUE" }));
assert!(vars_os().any(|(k, v)| { &*k == &*n && &*v == "VALUE" }));
}
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