1 // Test that a custom handler works on wasm32-unknown-unknown
2 #![cfg(all(
3 target_arch = "wasm32",
4 target_os = "unknown",
5 feature = "custom",
6 not(feature = "js")
7 ))]
8
9 use wasm_bindgen_test::wasm_bindgen_test as test;
10 #[cfg(feature = "test-in-browser")]
11 wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
12
13 use core::{
14 num::NonZeroU32,
15 sync::atomic::{AtomicU8, Ordering},
16 };
17 use getrandom::{getrandom, register_custom_getrandom, Error};
18
len7_err() -> Error19 fn len7_err() -> Error {
20 NonZeroU32::new(Error::INTERNAL_START + 7).unwrap().into()
21 }
22
super_insecure_rng(buf: &mut [u8]) -> Result<(), Error>23 fn super_insecure_rng(buf: &mut [u8]) -> Result<(), Error> {
24 // Length 7 buffers return a custom error
25 if buf.len() == 7 {
26 return Err(len7_err());
27 }
28 // Otherwise, increment an atomic counter
29 static COUNTER: AtomicU8 = AtomicU8::new(0);
30 for b in buf {
31 *b = COUNTER.fetch_add(1, Ordering::Relaxed);
32 }
33 Ok(())
34 }
35
36 register_custom_getrandom!(super_insecure_rng);
37
38 #[test]
custom_rng_output()39 fn custom_rng_output() {
40 let mut buf = [0u8; 4];
41 assert_eq!(getrandom(&mut buf), Ok(()));
42 assert_eq!(buf, [0, 1, 2, 3]);
43 assert_eq!(getrandom(&mut buf), Ok(()));
44 assert_eq!(buf, [4, 5, 6, 7]);
45 }
46
47 #[test]
rng_err_output()48 fn rng_err_output() {
49 assert_eq!(getrandom(&mut [0; 7]), Err(len7_err()));
50 }
51