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use std::env::*;
use std::ffi::{OsStr, OsString};
use rand::distributions::{Alphanumeric, DistString};
/// Copied from `std::test_helpers::test_rng`, since these tests rely on the
/// seed not being the same for every RNG invocation too.
#[track_caller]
pub(crate) fn test_rng() -> rand_xorshift::XorShiftRng {
use core::hash::{BuildHasher, Hash, Hasher};
let mut hasher = std::collections::hash_map::RandomState::new().build_hasher();
core::panic::Location::caller().hash(&mut hasher);
let hc64 = hasher.finish();
let seed_vec = hc64.to_le_bytes().into_iter().chain(0u8..8).collect::<Vec<u8>>();
let seed: [u8; 16] = seed_vec.as_slice().try_into().unwrap();
rand::SeedableRng::from_seed(seed)
}
#[track_caller]
fn make_rand_name() -> OsString {
let n = format!("TEST{}", Alphanumeric.sample_string(&mut test_rng(), 10));
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" }));
}
#[test]
#[cfg_attr(not(any(unix, windows)), ignore, allow(unused))]
#[allow(deprecated)]
fn env_home_dir() {
use std::path::PathBuf;
fn var_to_os_string(var: Result<String, VarError>) -> Option<OsString> {
match var {
Ok(var) => Some(OsString::from(var)),
Err(VarError::NotUnicode(var)) => Some(var),
_ => None,
}
}
cfg_if::cfg_if! {
if #[cfg(unix)] {
let oldhome = var_to_os_string(var("HOME"));
set_var("HOME", "/home/MountainView");
assert_eq!(home_dir(), Some(PathBuf::from("/home/MountainView")));
remove_var("HOME");
if cfg!(target_os = "android") {
assert!(home_dir().is_none());
} else {
// When HOME is not set, some platforms return `None`,
// but others return `Some` with a default.
// Just check that it is not "/home/MountainView".
assert_ne!(home_dir(), Some(PathBuf::from("/home/MountainView")));
}
if let Some(oldhome) = oldhome { set_var("HOME", oldhome); }
} else if #[cfg(windows)] {
let oldhome = var_to_os_string(var("HOME"));
let olduserprofile = var_to_os_string(var("USERPROFILE"));
remove_var("HOME");
remove_var("USERPROFILE");
assert!(home_dir().is_some());
set_var("HOME", "/home/MountainView");
assert_eq!(home_dir(), Some(PathBuf::from("/home/MountainView")));
remove_var("HOME");
set_var("USERPROFILE", "/home/MountainView");
assert_eq!(home_dir(), Some(PathBuf::from("/home/MountainView")));
set_var("HOME", "/home/MountainView");
set_var("USERPROFILE", "/home/PaloAlto");
assert_eq!(home_dir(), Some(PathBuf::from("/home/MountainView")));
remove_var("HOME");
remove_var("USERPROFILE");
if let Some(oldhome) = oldhome { set_var("HOME", oldhome); }
if let Some(olduserprofile) = olduserprofile { set_var("USERPROFILE", olduserprofile); }
}
}
}
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