organize pass-dep tests more by the crate they test

Author: RalfJung

src/tools/miri/test_dependencies/Cargo.toml

@@ -12,8 +12,8 @@ edition = "2021"
 libc = "0.2"
 num_cpus = "1.10.1"
 
-getrandom_1 = { package = "getrandom", version = "0.1" }
-getrandom = { version = "0.2", features = ["js"] }
+getrandom_01 = { package = "getrandom", version = "0.1" }
+getrandom_02 = { package = "getrandom", version = "0.2", features = ["js"] }
 rand = { version = "0.8", features = ["small_rng"] }
 
 [target.'cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))'.dependencies]

src/tools/miri/tests/pass-dep/getrandom.rs

@@ -0,0 +1,9 @@
+// mac-os `getrandom_01` does some pointer shenanigans
+//@compile-flags: -Zmiri-permissive-provenance
+
+/// Test direct calls of getrandom 0.1 and 0.2
+fn main() {
+    let mut data = vec![0; 16];
+    getrandom_01::getrandom(&mut data).unwrap();
+    getrandom_02::getrandom(&mut data).unwrap();
+}

src/tools/miri/tests/pass-dep/getrandom_1.rs

@@ -1,10 +1,13 @@
 //@compile-flags: -Zmiri-strict-provenance
-use rand::{rngs::SmallRng, Rng, SeedableRng};
+use rand::prelude::*;
 
+// Test using the `rand` crate to generate randomness.
 fn main() {
-    // Test `getrandom` directly.
-    let mut data = vec![0; 16];
-    getrandom::getrandom(&mut data).unwrap();
+    // Fully deterministic seeding.
+    let mut rng = SmallRng::seed_from_u64(42);
+    let _val = rng.gen::<i32>();
+    let _val = rng.gen::<isize>();
+    let _val = rng.gen::<i128>();
 
     // Try seeding with "real" entropy.
     let mut rng = SmallRng::from_entropy();