diff --git a/tests/by-util/test_expr.rs b/tests/by-util/test_expr.rs
index 7c9290d6a..5cbf91e0c 100644
--- a/tests/by-util/test_expr.rs
+++ b/tests/by-util/test_expr.rs
@@ -318,13 +318,13 @@ fn test_invalid_substr() {
         .stdout_only("\n");
 
     new_ucmd!()
-        .args(&["substr", "abc", &(std::usize::MAX.to_string() + "0"), "1"])
+        .args(&["substr", "abc", &(usize::MAX.to_string() + "0"), "1"])
         .fails()
         .code_is(1)
         .stdout_only("\n");
 
     new_ucmd!()
-        .args(&["substr", "abc", "0", &(std::usize::MAX.to_string() + "0")])
+        .args(&["substr", "abc", "0", &(usize::MAX.to_string() + "0")])
         .fails()
         .code_is(1)
         .stdout_only("\n");
diff --git a/tests/by-util/test_hashsum.rs b/tests/by-util/test_hashsum.rs
index ee792f0d4..b1bacdc4a 100644
--- a/tests/by-util/test_hashsum.rs
+++ b/tests/by-util/test_hashsum.rs
@@ -472,7 +472,7 @@ fn test_with_escape_filename() {
     at.touch(filename);
     let result = scene.ccmd("md5sum").arg("--text").arg(filename).succeeds();
     let stdout = result.stdout_str();
-    println!("stdout {}", stdout);
+    println!("stdout {stdout}");
     assert!(stdout.starts_with('\\'));
     assert!(stdout.trim().ends_with("a\\nb"));
 }
@@ -492,7 +492,7 @@ fn test_with_escape_filename_zero_text() {
         .arg(filename)
         .succeeds();
     let stdout = result.stdout_str();
-    println!("stdout {}", stdout);
+    println!("stdout {stdout}");
     assert!(!stdout.starts_with('\\'));
     assert!(stdout.contains("a\nb"));
 }
@@ -526,7 +526,7 @@ fn test_check_with_escape_filename() {
     at.touch(filename);
     let result = scene.ccmd("md5sum").arg("--tag").arg(filename).succeeds();
     let stdout = result.stdout_str();
-    println!("stdout {}", stdout);
+    println!("stdout {stdout}");
     assert!(stdout.starts_with("\\MD5"));
     assert!(stdout.contains("a\\nb"));
     at.write("check.md5", stdout);
diff --git a/tests/by-util/test_ls.rs b/tests/by-util/test_ls.rs
index 03c8327dd..498d6284f 100644
--- a/tests/by-util/test_ls.rs
+++ b/tests/by-util/test_ls.rs
@@ -159,7 +159,7 @@ fn get_filesystem_type(scene: &TestScenario, path: &Path) -> String {
     cmd.args(&["-PT"]).arg(path);
     let output = cmd.succeeds();
     let stdout_str = String::from_utf8_lossy(output.stdout());
-    println!("output of stat call ({:?}):\n{}", cmd, stdout_str);
+    println!("output of stat call ({cmd:?}):\n{stdout_str}");
     let regex_str = r#"Filesystem\s+Type\s+.+[\r\n]+([^\s]+)\s+(?<fstype>[^\s]+)\s+"#;
     let regex = Regex::new(regex_str).unwrap();
     let m = regex.captures(&stdout_str).unwrap();
@@ -2243,7 +2243,7 @@ fn test_ls_color() {
         .arg("-w=15")
         .arg("-C")
         .succeeds();
-    let expected = format!("{}  test-color\x0ab  {}", a_with_colors, z_with_colors);
+    let expected = format!("{a_with_colors}  test-color\x0ab  {z_with_colors}");
     assert_eq!(
         result.stdout_str().escape_default().to_string(),
         expected.escape_default().to_string()
@@ -3888,7 +3888,7 @@ fn test_device_number() {
     let blk_dev_meta = metadata(blk_dev_path.as_path()).unwrap();
     let blk_dev_number = blk_dev_meta.rdev() as dev_t;
     let (major, minor) = unsafe { (major(blk_dev_number), minor(blk_dev_number)) };
-    let major_minor_str = format!("{}, {}", major, minor);
+    let major_minor_str = format!("{major}, {minor}");
 
     let scene = TestScenario::new(util_name!());
     scene
@@ -4000,7 +4000,7 @@ fn test_ls_dired_recursive_multiple() {
         .skip(1)
         .map(|s| s.parse().unwrap())
         .collect();
-    println!("Parsed byte positions: {:?}", positions);
+    println!("Parsed byte positions: {positions:?}");
     assert_eq!(positions.len() % 2, 0); // Ensure there's an even number of positions
 
     let filenames: Vec<String> = positions
@@ -4017,7 +4017,7 @@ fn test_ls_dired_recursive_multiple() {
         })
         .collect();
 
-    println!("Extracted filenames: {:?}", filenames);
+    println!("Extracted filenames: {filenames:?}");
     assert_eq!(filenames, vec!["d1", "d2", "f1", "file-long", "a", "c2"]);
 }
 
@@ -4087,7 +4087,7 @@ fn test_ls_dired_complex() {
     }
 
     let output = result.stdout_str().to_string();
-    println!("Output:\n{}", output);
+    println!("Output:\n{output}");
 
     let dired_line = output
         .lines()
diff --git a/tests/by-util/test_shuf.rs b/tests/by-util/test_shuf.rs
index 8a991e435..a3cbd12be 100644
--- a/tests/by-util/test_shuf.rs
+++ b/tests/by-util/test_shuf.rs
@@ -93,7 +93,7 @@ fn test_very_large_range() {
     let num_samples = 10;
     let result = new_ucmd!()
         .arg("-n")
-        .arg(&num_samples.to_string())
+        .arg(num_samples.to_string())
         .arg("-i0-1234567890")
         .succeeds();
     result.no_stderr();
@@ -117,7 +117,7 @@ fn test_very_large_range_offset() {
     let num_samples = 10;
     let result = new_ucmd!()
         .arg("-n")
-        .arg(&num_samples.to_string())
+        .arg(num_samples.to_string())
         .arg("-i1234567890-2147483647")
         .succeeds();
     result.no_stderr();
@@ -140,7 +140,7 @@ fn test_very_large_range_offset() {
 
 #[test]
 fn test_range_repeat_no_overflow_1_max() {
-    let upper_bound = std::usize::MAX;
+    let upper_bound = usize::MAX;
     let result = new_ucmd!()
         .arg("-rn1")
         .arg(&format!("-i1-{upper_bound}"))
@@ -255,7 +255,7 @@ fn test_range_repeat() {
     let result = new_ucmd!()
         .arg("-r")
         .arg("-n")
-        .arg(&num_samples.to_string())
+        .arg(num_samples.to_string())
         .arg("-i12-34")
         .succeeds();
     result.no_stderr();
@@ -472,9 +472,9 @@ fn test_head_count_multi_big_then_small() {
 
     let result = new_ucmd!()
         .arg("-n")
-        .arg(&(repeat_limit + 1).to_string())
+        .arg((repeat_limit + 1).to_string())
         .arg("-n")
-        .arg(&repeat_limit.to_string())
+        .arg(repeat_limit.to_string())
         .pipe_in(input.as_bytes())
         .succeeds();
     result.no_stderr();
@@ -505,9 +505,9 @@ fn test_head_count_multi_small_then_big() {
 
     let result = new_ucmd!()
         .arg("-n")
-        .arg(&repeat_limit.to_string())
+        .arg(repeat_limit.to_string())
         .arg("-n")
-        .arg(&(repeat_limit + 1).to_string())
+        .arg((repeat_limit + 1).to_string())
         .pipe_in(input.as_bytes())
         .succeeds();
     result.no_stderr();
diff --git a/tests/by-util/test_tail.rs b/tests/by-util/test_tail.rs
index b8135380d..1df5eade9 100644
--- a/tests/by-util/test_tail.rs
+++ b/tests/by-util/test_tail.rs
@@ -4307,18 +4307,14 @@ fn test_follow_when_file_and_symlink_are_pointing_to_same_file_and_append_data()
     at.append(path_name, more_data);
 
     let expected_stdout = format!(
-        "==> {0} <==\n\
-        {1}\n\
-        ==> {2} <==\n\
-        {1}\n\
-        ==> {0} <==\n\
-        {3}\n\
-        ==> {2} <==\n\
-        {3}",
-        path_name, // 0
-        file_data, // 1
-        link_name, // 2
-        more_data, // 3
+        "==> {path_name} <==\n\
+        {file_data}\n\
+        ==> {link_name} <==\n\
+        {file_data}\n\
+        ==> {path_name} <==\n\
+        {more_data}\n\
+        ==> {link_name} <==\n\
+        {more_data}"
     );
 
     child.make_assertion_with_delay(500).is_alive();
@@ -4345,18 +4341,14 @@ fn test_follow_when_file_and_symlink_are_pointing_to_same_file_and_append_data()
     at.append(path_name, more_data);
 
     let expected_stdout = format!(
-        "==> {0} <==\n\
-        {1}\n\
-        ==> {2} <==\n\
-        {1}\n\
-        ==> {0} <==\n\
-        {3}\n\
-        ==> {2} <==\n\
-        {3}",
-        link_name, // 0
-        file_data, // 1
-        path_name, // 2
-        more_data, // 3
+        "==> {link_name} <==\n\
+        {file_data}\n\
+        ==> {path_name} <==\n\
+        {file_data}\n\
+        ==> {link_name} <==\n\
+        {more_data}\n\
+        ==> {path_name} <==\n\
+        {more_data}"
     );
 
     child.make_assertion_with_delay(500).is_alive();
@@ -4375,9 +4367,8 @@ fn test_args_when_directory_given_shorthand_big_f_together_with_retry() {
     let dirname = "dir";
     at.mkdir(dirname);
     let expected_stderr = format!(
-        "tail: error reading '{0}': Is a directory\n\
-         tail: {0}: cannot follow end of this type of file\n",
-        dirname
+        "tail: error reading '{dirname}': Is a directory\n\
+         tail: {dirname}: cannot follow end of this type of file\n"
     );
     let mut child = scene.ucmd().args(&["-F", "--retry", "dir"]).run_no_wait();
 
diff --git a/tests/by-util/test_unexpand.rs b/tests/by-util/test_unexpand.rs
index c1310be01..6bbd94999 100644
--- a/tests/by-util/test_unexpand.rs
+++ b/tests/by-util/test_unexpand.rs
@@ -245,7 +245,7 @@ fn test_is_directory() {
 
     ucmd.arg(dir_name)
         .fails()
-        .stderr_contains(format!("unexpand: {}: Is a directory", dir_name));
+        .stderr_contains(format!("unexpand: {dir_name}: Is a directory"));
 }
 
 #[test]
diff --git a/tests/by-util/test_wc.rs b/tests/by-util/test_wc.rs
index d5d955c9b..71b10e191 100644
--- a/tests/by-util/test_wc.rs
+++ b/tests/by-util/test_wc.rs
@@ -446,7 +446,7 @@ fn test_files_from_pseudo_filesystem() {
         let actual = at.read("/sys/kernel/profiling").len();
         assert_eq!(
             result.stdout_str(),
-            format!("{} /sys/kernel/profiling\n", actual)
+            format!("{actual} /sys/kernel/profiling\n")
         );
     }
 }
diff --git a/tests/common/util.rs b/tests/common/util.rs
index 047d2c579..275a6ae68 100644
--- a/tests/common/util.rs
+++ b/tests/common/util.rs
@@ -77,9 +77,9 @@ fn read_scenario_fixture<S: AsRef<OsStr>>(tmpd: &Option<Rc<TempDir>>, file_rel_p
 /// within a struct which has convenience assertion functions about those outputs
 #[derive(Debug, Clone)]
 pub struct CmdResult {
-    /// bin_path provided by `TestScenario` or `UCommand`
+    /// `bin_path` provided by `TestScenario` or `UCommand`
     bin_path: PathBuf,
-    /// util_name provided by `TestScenario` or `UCommand`
+    /// `util_name` provided by `TestScenario` or `UCommand`
     util_name: Option<String>,
     //tmpd is used for convenience functions for asserts against fixtures
     tmpd: Option<Rc<TempDir>>,
@@ -1446,7 +1446,7 @@ impl UCommand {
     /// This is useful to test behavior that is only active if e.g. [`stdout.is_terminal()`] is [`true`].
     /// This function uses default terminal size and attaches stdin, stdout and stderr to that terminal.
     /// For more control over the terminal simulation, use `terminal_sim_stdio`
-    /// (unix: pty, windows: ConPTY[not yet supported])
+    /// (unix: pty, windows: `ConPTY`[not yet supported])
     #[cfg(unix)]
     pub fn terminal_simulation(&mut self, enable: bool) -> &mut Self {
         if enable {
@@ -1483,7 +1483,7 @@ impl UCommand {
             // Input/output error (os error 5) is returned due to pipe closes. Buffer gets content anyway.
             Err(e) if e.raw_os_error().unwrap_or_default() == 5 => {}
             Err(e) => {
-                eprintln!("Unexpected error: {:?}", e);
+                eprintln!("Unexpected error: {e:?}");
                 panic!("error forwarding output of pty");
             }
         }
@@ -1754,7 +1754,7 @@ impl UCommand {
 
     /// Spawns the command, feeds the stdin if any, waits for the result
     /// and returns a command result.
-    /// It is recommended that you instead use succeeds() or fails()
+    /// It is recommended that you instead use `succeeds()` or `fails()`
     pub fn run(&mut self) -> CmdResult {
         self.run_no_wait().wait().unwrap()
     }
@@ -1762,7 +1762,7 @@ impl UCommand {
     /// Spawns the command, feeding the passed in stdin, waits for the result
     /// and returns a command result.
     /// It is recommended that, instead of this, you use a combination of `pipe_in()`
-    /// with succeeds() or fails()
+    /// with `succeeds()` or `fails()`
     pub fn run_piped_stdin<T: Into<Vec<u8>>>(&mut self, input: T) -> CmdResult {
         self.pipe_in(input).run()
     }
@@ -3840,7 +3840,7 @@ mod tests {
 
         std::assert_eq!(
             String::from_utf8_lossy(out.stdout()),
-            format!("{}\r\n", message)
+            format!("{message}\r\n")
         );
         std::assert_eq!(String::from_utf8_lossy(out.stderr()), "");
     }
diff --git a/tests/test_util_name.rs b/tests/test_util_name.rs
index db4537e2a..689c38214 100644
--- a/tests/test_util_name.rs
+++ b/tests/test_util_name.rs
@@ -114,15 +114,10 @@ fn util_invalid_name_help() {
     assert_eq!(output.status.code(), Some(0));
     assert_eq!(output.stderr, b"");
     let output_str = String::from_utf8(output.stdout).unwrap();
-    assert!(
-        output_str.contains("(multi-call binary)"),
-        "{:?}",
-        output_str
-    );
+    assert!(output_str.contains("(multi-call binary)"), "{output_str:?}");
     assert!(
         output_str.contains("Usage: invalid_name [function "),
-        "{:?}",
-        output_str
+        "{output_str:?}"
     );
 }
 
@@ -155,15 +150,10 @@ fn util_non_utf8_name_help() {
     assert_eq!(output.status.code(), Some(0));
     assert_eq!(output.stderr, b"");
     let output_str = String::from_utf8(output.stdout).unwrap();
-    assert!(
-        output_str.contains("(multi-call binary)"),
-        "{:?}",
-        output_str
-    );
+    assert!(output_str.contains("(multi-call binary)"), "{output_str:?}");
     assert!(
         output_str.contains("Usage: <unknown binary name> [function "),
-        "{:?}",
-        output_str
+        "{output_str:?}"
     );
 }
 
@@ -217,8 +207,7 @@ fn util_completion() {
     let output_str = String::from_utf8(output.stdout).unwrap();
     assert!(
         output_str.contains("using namespace System.Management.Automation"),
-        "{:?}",
-        output_str
+        "{output_str:?}"
     );
 }
 
@@ -243,5 +232,5 @@ fn util_manpage() {
     assert_eq!(output.status.code(), Some(0));
     assert_eq!(output.stderr, b"");
     let output_str = String::from_utf8(output.stdout).unwrap();
-    assert!(output_str.contains("\n.TH true 1 "), "{:?}", output_str);
+    assert!(output_str.contains("\n.TH true 1 "), "{output_str:?}");
 }