Remove rng_state test

Author: dhardy

src/rngs/std.rs

@@ -103,24 +103,6 @@ mod test {
     use crate::rngs::StdRng;
     use crate::{RngCore, SeedableRng};
 
-    // Get ChaCha state, omitting the constants
-    fn rng_state(rng: &StdRng) -> &[u32; 12] {
-        use core::mem::{size_of, transmute};
-
-        // Experimentally this matches the size and layout of rand_core::ChaCha12Rng
-        struct State {
-            _results: [u32; 64],
-            _index: usize,
-            #[cfg(target_pointer_width = "64")]
-            _pad: usize,
-            state: [u32; 12],
-        }
-        assert_eq!(size_of::<StdRng>(), size_of::<State>());
-
-        let state: &State = unsafe { transmute(rng) };
-        &state.state
-    }
-
     #[test]
     fn test_stdrng_construction() {
         // Test value-stability of StdRng. This is expected to break any time
@@ -133,20 +115,11 @@ mod test {
 
         let mut rng0 = StdRng::from_seed(seed);
 
-        let expected = [1, 23, 456, 7890, 0, 0, 0, 0, 0, 0, 0, 0];
-        assert_eq!(rng_state(&rng0), &expected);
-
         let x0 = rng0.next_u64();
 
         let mut rng1 = StdRng::from_rng(&mut rng0);
         let x1 = rng1.next_u64();
 
-        let expected = [
-            0x98c064cf, 0x42da2de, 0xb7949e00, 0xf46bfbdb, 0x7e3b786e, 0xaaddd44f, 0xf7a37c04,
-            0x8255c7e9, 4, 0, 0, 0,
-        ];
-        assert_eq!(rng_state(&rng1), &expected);
-
         assert_eq!([x0, x1], target);
     }
 
@@ -160,8 +133,6 @@ mod test {
         let seed = [0u8; 32];
         let mut rng = StdRng::from_seed(seed);
 
-        assert_eq!(rng_state(&rng), &[0u32; 12]);
-
         let mut results = [0u8; 64];
         rng.fill_bytes(&mut results);
         #[rustfmt::skip]
@@ -205,10 +176,6 @@ mod test {
         seed[0] = 1;
         let mut rng = StdRng::from_seed(seed);
 
-        let mut expected = [0u32; 12];
-        expected[0] = 1;
-        assert_eq!(rng_state(&rng), &expected);
-
         let mut results = [0u8; 64];
         rng.fill_bytes(&mut results);
         #[rustfmt::skip]
@@ -252,10 +219,6 @@ mod test {
         let mut rng = StdRng::from_seed(seed);
         rng.0.set_stream(1);
 
-        let mut expected = [0u32; 12];
-        expected[10] = 1;
-        assert_eq!(rng_state(&rng), &expected);
-
         let mut results = [0u8; 64];
         rng.fill_bytes(&mut results);
         #[rustfmt::skip]
@@ -306,17 +269,6 @@ mod test {
         let mut rng = StdRng::from_seed(seed);
         rng.0.set_stream(u64::from_le_bytes(iv));
 
-        #[rustfmt::skip]
-        let expected = [
-            0xb1c16ec4, 0x78a8e88c,
-            0xe7375a72, 0x35b7df80,
-            0x2eed681f, 0xfb794c19,
-            0xe1beaec6, 0x5d9767a6,
-            0x00000000, 0x00000000,
-            0xd531da1a, 0x218268cf,
-        ];
-        assert_eq!(rng_state(&rng), &expected);
-
         let mut results = [0u8; 64];
         rng.fill_bytes(&mut results);
         #[rustfmt::skip]
@@ -360,12 +312,6 @@ mod test {
         let words_per_block = 16;
         rng.0.set_word_pos((block as u128) * words_per_block);
 
-        let mut expected = [0u32; 12];
-        // Note: four blocks get generated by set_word_pos
-        expected[8] = block.wrapping_add(4);
-        expected[9] = 1;
-        assert_eq!(rng_state(&rng), &expected);
-
         let mut results = [0u8; 64];
         rng.fill_bytes(&mut results);
         #[rustfmt::skip]