test_sort: use Pcg32 random number generator

Cargo.lock

@@ -367,6 +367,7 @@ dependencies = [
  "pretty_assertions",
  "procfs",
  "rand",
+ "rand_pcg",
  "regex",
  "rlimit",
  "selinux",
@@ -1664,6 +1665,15 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "rand_pcg"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59cad018caf63deb318e5a4586d99a24424a364f40f1e5778c29aca23f4fc73e"
+dependencies = [
+ "rand_core",
+]
+
 [[package]]
 name = "rayon"
 version = "1.5.3"

Cargo.toml

@@ -391,6 +391,7 @@ glob = "0.3.0"
 libc = "0.2"
 pretty_assertions = "1"
 rand = "0.8"
+rand_pcg = "0.3"
 regex = "1.6"
 sha1 = { version="0.10", features=["std"] }
 tempfile = "3"

tests/by-util/test_sort.rs

@@ -1119,13 +1119,13 @@ fn test_tmp_files_deleted_on_sigint() {
     at.mkdir("tmp_dir");
     let file_name = "big_file_to_sort.txt";
     {
-        use rand::Rng;
+        use rand::{Rng, SeedableRng};
         use std::io::Write;
         let mut file = at.make_file(file_name);
         // approximately 20 MB
         for _ in 0..40 {
-            let lines = rand::thread_rng()
-                .sample_iter(rand::distributions::uniform::Uniform::new(0, 10007))
+            let lines = rand_pcg::Pcg32::seed_from_u64(123)
+                .sample_iter(rand::distributions::uniform::Uniform::new(0, 10000))
                 .take(100000)
                 .map(|x| x.to_string() + "\n")
                 .collect::<String>();