diff --git a/tests/by-util/test_chmod.rs b/tests/by-util/test_chmod.rs
index 925643add3..639e955fd5 100644
--- a/tests/by-util/test_chmod.rs
+++ b/tests/by-util/test_chmod.rs
@@ -545,8 +545,8 @@ fn test_mode_after_dash_dash() {
     run_single_test(
         &TestCase {
             args: vec!["--", "-r", TEST_FILE],
-            before: 0o100777,
-            after: 0o100333,
+            before: 0o100_777,
+            after: 0o100_333,
         },
         &at,
         ucmd,
@@ -570,7 +570,7 @@ fn test_chmod_file_after_non_existing_file() {
         .stderr_contains("chmod: cannot access 'does-not-exist': No such file or directory")
         .code_is(1);
 
-    assert_eq!(at.metadata(TEST_FILE).permissions().mode(), 0o100764);
+    assert_eq!(at.metadata(TEST_FILE).permissions().mode(), 0o100_764);
 
     scene
         .ucmd()
@@ -581,7 +581,7 @@ fn test_chmod_file_after_non_existing_file() {
         .fails()
         .no_stderr()
         .code_is(1);
-    assert_eq!(at.metadata("file2").permissions().mode(), 0o100764);
+    assert_eq!(at.metadata("file2").permissions().mode(), 0o100_764);
 }
 
 #[test]
@@ -617,7 +617,7 @@ fn test_chmod_file_symlink_after_non_existing_file() {
         .stderr_contains(expected_stderr);
     assert_eq!(
         at.metadata(test_existing_symlink).permissions().mode(),
-        0o100764
+        0o100_764
     );
 }
 
@@ -679,8 +679,8 @@ fn test_gnu_repeating_options() {
 fn test_gnu_special_filenames() {
     let scene = TestScenario::new(util_name!());
     let at = &scene.fixtures;
-    let perms_before = Permissions::from_mode(0o100640);
-    let perms_after = Permissions::from_mode(0o100440);
+    let perms_before = Permissions::from_mode(0o100_640);
+    let perms_after = Permissions::from_mode(0o100_440);
 
     make_file(&at.plus_as_string("--"), perms_before.mode());
     scene.ucmd().arg("-w").arg("--").arg("--").succeeds();
diff --git a/tests/by-util/test_sort.rs b/tests/by-util/test_sort.rs
index f2d0cd5ce3..c815221f1f 100644
--- a/tests/by-util/test_sort.rs
+++ b/tests/by-util/test_sort.rs
@@ -1133,7 +1133,7 @@ fn test_tmp_files_deleted_on_sigint() {
         for _ in 0..40 {
             let lines = rand_pcg::Pcg32::seed_from_u64(123)
                 .sample_iter(rand::distributions::uniform::Uniform::new(0, 10000))
-                .take(100000)
+                .take(100_000)
                 .map(|x| x.to_string() + "\n")
                 .collect::<String>();
             file.write_all(lines.as_bytes()).unwrap();
diff --git a/tests/by-util/test_tee.rs b/tests/by-util/test_tee.rs
index 5dc5a28716..fd773e690a 100644
--- a/tests/by-util/test_tee.rs
+++ b/tests/by-util/test_tee.rs
@@ -130,7 +130,7 @@ mod linux_only {
     }
 
     fn run_tee(proc: &mut UCommand) -> (String, Output) {
-        let content = (1..=100000).map(|x| format!("{x}\n")).collect::<String>();
+        let content = (1..=100_000).map(|x| format!("{x}\n")).collect::<String>();
 
         #[allow(deprecated)]
         let output = proc
diff --git a/tests/by-util/test_touch.rs b/tests/by-util/test_touch.rs
index 7ae8a39058..3ca2538658 100644
--- a/tests/by-util/test_touch.rs
+++ b/tests/by-util/test_touch.rs
@@ -425,7 +425,7 @@ fn test_touch_set_date3() {
 
     assert!(at.file_exists(file));
 
-    let expected = FileTime::from_unix_time(1623786360, 0);
+    let expected = FileTime::from_unix_time(1_623_786_360, 0);
     let (atime, mtime) = get_file_times(&at, file);
     assert_eq!(atime, mtime);
     assert_eq!(atime, expected);
@@ -466,7 +466,7 @@ fn test_touch_set_date5() {
     #[cfg(windows)]
     let expected = FileTime::from_unix_time(67413, 23456700);
     #[cfg(not(windows))]
-    let expected = FileTime::from_unix_time(67413, 23456789);
+    let expected = FileTime::from_unix_time(67413, 23_456_789);
 
     let (atime, mtime) = get_file_times(&at, file);
     assert_eq!(atime, mtime);
@@ -485,7 +485,7 @@ fn test_touch_set_date6() {
 
     assert!(at.file_exists(file));
 
-    let expected = FileTime::from_unix_time(946684800, 0);
+    let expected = FileTime::from_unix_time(946_684_800, 0);
 
     let (atime, mtime) = get_file_times(&at, file);
     assert_eq!(atime, mtime);
@@ -504,7 +504,7 @@ fn test_touch_set_date7() {
 
     assert!(at.file_exists(file));
 
-    let expected = FileTime::from_unix_time(1074254400, 0);
+    let expected = FileTime::from_unix_time(1_074_254_400, 0);
 
     let (atime, mtime) = get_file_times(&at, file);
     assert_eq!(atime, mtime);