refactor: improve test structure and reliability

src/modes/diff.rs

@@ -1,7 +1,7 @@
 use crate::compression::CompressionType;
+use libc::c_int;
 use std::path::PathBuf;
 use std::str::FromStr;
-use libc::c_int;
 
 use anyhow::{anyhow, Result};
 use clap::Command;
@@ -150,26 +150,16 @@ pub fn mode_diff(
     ) -> std::thread::JoinHandle<()> {
         let pipe_writer_raw = unsafe { std::fs::File::from_raw_fd(fd_write) };
         std::thread::spawn(move || {
-            write_item_to_pipe(
-                item_path,
-                compression_type,
-                pipe_writer_raw,
-            );
+            write_item_to_pipe(item_path, compression_type, pipe_writer_raw);
         })
     }
 
     // Spawn writer threads for both items
-    let writer_thread_a = spawn_writer_thread(
-        item_path_a.clone(),
-        compression_type_a.clone(),
-        fd_a_write,
-    );
+    let writer_thread_a =
+        spawn_writer_thread(item_path_a.clone(), compression_type_a.clone(), fd_a_write);
 
-    let writer_thread_b = spawn_writer_thread(
-        item_path_b.clone(),
-        compression_type_b.clone(),
-        fd_b_write,
-    );
+    let writer_thread_b =
+        spawn_writer_thread(item_path_b.clone(), compression_type_b.clone(), fd_b_write);
 
     // Thread to read diff's standard output
     let stdout_reader_thread = std::thread::spawn(move || {
@@ -232,19 +222,19 @@ pub fn mode_diff(
     let stdout_capture_result = stdout_reader_thread
         .join()
         .unwrap_or_else(|panic_payload| {
-        Err(anyhow!(
-            "Stdout reader thread panicked: {:?}",
-            panic_payload
-        ))
-    })?;
+            Err(anyhow!(
+                "Stdout reader thread panicked: {:?}",
+                panic_payload
+            ))
+        })?;
     let stderr_capture_result = stderr_reader_thread
         .join()
         .unwrap_or_else(|panic_payload| {
-        Err(anyhow!(
-            "Stderr reader thread panicked: {:?}",
-            panic_payload
-        ))
-    })?;
+            Err(anyhow!(
+                "Stderr reader thread panicked: {:?}",
+                panic_payload
+            ))
+        })?;
 
     // Handle diff's exit status and output
     match diff_status.code() {