test rand a bit more

test-cargo-miri/tests/test.rs

@@ -1,8 +1,4 @@
-#![allow(unused_imports)] // FIXME for macOS
-
-extern crate rand;
-
-use rand::{SeedableRng, FromEntropy, Rng, rngs::SmallRng};
+use rand::{Rng, SeedableRng};
 
 #[test]
 fn simple() {
@@ -15,22 +11,30 @@ fn simple() {
 fn fixed_rng() {
     let mut rng = rand::rngs::StdRng::seed_from_u64(0xdeadcafe);
     let x: u32 = rng.gen();
-    let y: u32 = rng.gen();
-    assert_ne!(x, y);
+    let y: usize = rng.gen();
+    let z: u128 = rng.gen();
+    assert_ne!(x as usize, y);
+    assert_ne!(y as u128, z);
 }
 
 #[test]
 fn entropy_rng() {
     #[cfg(not(target_os="macos"))] // FIXME entropy does not work on macOS
     // (Not disabling the entire test as that would change the output.)
     {
+        use rand::{FromEntropy, rngs::SmallRng};
+
         // Use this opportunity to test querying the RNG (needs an external crate, hence tested here and not in the compiletest suite)
         let mut rng = SmallRng::from_entropy();
         let _val = rng.gen::<i32>();
+        let _val = rng.gen::<isize>();
+        let _val = rng.gen::<i128>();
 
         // Also try per-thread RNG.
         let mut rng = rand::thread_rng();
         let _val = rng.gen::<i32>();
+        let _val = rng.gen::<isize>();
+        let _val = rng.gen::<i128>();
     }
 }