diff --git a/.gitignore b/.gitignore
index c009900..f3b1c4b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 /target
 be2json
-output.json
\ No newline at end of file
+output.json
diff --git a/Cargo.lock b/Cargo.lock
index b3202a3..d5d4e5f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -38,7 +38,7 @@ version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6d36fc52c7f6c869915e99412912f22093507da8d9e942ceaf66fe4b7c14422a"
 dependencies = [
- "windows-sys",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -48,7 +48,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5bf74e1b6e971609db8ca7a9ce79fd5768ab6ae46441c572e46cf596f59e57f8"
 dependencies = [
  "anstyle",
- "windows-sys",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -67,6 +67,12 @@ dependencies = [
  "wait-timeout",
 ]
 
+[[package]]
+name = "bitflags"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
+
 [[package]]
 name = "bstr"
 version = "1.10.0"
@@ -78,6 +84,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "clap"
 version = "4.5.17"
@@ -136,6 +148,22 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
 
+[[package]]
+name = "errno"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "534c5cf6194dfab3db3242765c03bbe257cf92f22b38f6bc0c58d59108a820ba"
+dependencies = [
+ "libc",
+ "windows-sys 0.52.0",
+]
+
+[[package]]
+name = "fastrand"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8c02a5121d4ea3eb16a80748c74f5549a5665e4c21333c6098f283870fbdea6"
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -160,12 +188,24 @@ version = "0.2.158"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d8adc4bb1803a324070e64a98ae98f38934d91957a99cfb3a43dcbc01bc56439"
 
+[[package]]
+name = "linux-raw-sys"
+version = "0.4.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78b3ae25bc7c8c38cec158d1f2757ee79e9b3740fbc7ccf0e59e4b08d793fa89"
+
 [[package]]
 name = "memchr"
 version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
+[[package]]
+name = "once_cell"
+version = "1.20.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
+
 [[package]]
 name = "predicates"
 version = "3.1.2"
@@ -217,6 +257,19 @@ version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "38caf58cc5ef2fed281f89292ef23f6365465ed9a41b7a7754eb4e26496c92df"
 
+[[package]]
+name = "rustix"
+version = "0.38.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8acb788b847c24f28525660c4d7758620a7210875711f79e7f663cc152726811"
+dependencies = [
+ "bitflags",
+ "errno",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "serde"
 version = "1.0.210"
@@ -254,6 +307,19 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tempfile"
+version = "3.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0f2c9fc62d0beef6951ccffd757e241266a2c833136efbe35af6cd2567dca5b"
+dependencies = [
+ "cfg-if",
+ "fastrand",
+ "once_cell",
+ "rustix",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "termtree"
 version = "0.4.1"
@@ -287,6 +353,7 @@ dependencies = [
  "assert_cmd",
  "clap",
  "hex",
+ "tempfile",
  "thiserror",
 ]
 
@@ -320,6 +387,15 @@ dependencies = [
  "windows-targets",
 ]
 
+[[package]]
+name = "windows-sys"
+version = "0.59.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
+dependencies = [
+ "windows-targets",
+]
+
 [[package]]
 name = "windows-targets"
 version = "0.52.6"
diff --git a/Cargo.toml b/Cargo.toml
index 3234ca7..6fa6f0f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,3 +10,4 @@ thiserror = "1.0.64"
 
 [dev-dependencies]
 assert_cmd = "2.0"
+tempfile = "3.13.0"
diff --git a/output.json b/output.json
deleted file mode 100644
index d9fe820..0000000
--- a/output.json
+++ /dev/null
@@ -1 +0,0 @@
-["spam"]
\ No newline at end of file
diff --git a/project-words.txt b/project-words.txt
index 64e2bb0..9c285ac 100644
--- a/project-words.txt
+++ b/project-words.txt
@@ -15,4 +15,6 @@ llee
 llleee
 spame
 spamee
+tempdir
+tempfile
 thiserror
diff --git a/src/parsers/string.rs b/src/parsers/string.rs
index 2323fdc..d6c263d 100644
--- a/src/parsers/string.rs
+++ b/src/parsers/string.rs
@@ -5,10 +5,10 @@ use std::io::{self, Read};
 
 use crate::rw::{byte_reader::ByteReader, writer::Writer};
 
-/* todo:
-    - Optimize UTF-8 conversion. Try to convert to string partially or parts and
-      stop converting if we reach a point when input is not valid UTF-8 anymore.
-      This way we don't consume more memory.
+/* todo: Optimize UTF-8 conversion. Try to convert to string partially and stop
+    converting if we reach a point when input is not valid UTF-8 anymore. This
+    way we don't consume more memory and we can print the bytes directly to the
+    output from that point on.
 */
 
 use core::str;
diff --git a/tests/integration.rs b/tests/integration.rs
index dca9c3b..79da7e0 100644
--- a/tests/integration.rs
+++ b/tests/integration.rs
@@ -1,17 +1,25 @@
 use assert_cmd::Command;
+use std::fs;
+use tempfile::tempdir;
 
 #[test]
 fn test_from_file() {
+    let temp_dir = tempdir().unwrap();
+
+    let output_file = temp_dir.path().join("output.json");
+
     let mut cmd = Command::cargo_bin("torrust-bencode2json").unwrap();
+
     cmd.arg("-i")
         .arg("tests/fixtures/sample.bencode")
         .arg("-o")
-        .arg("output.json")
+        .arg(output_file.to_str().unwrap())
         .assert()
         .success();
 
-    // todo: check contents
-    // Read the file. It should contain: ["spam"]
+    let output_content = fs::read_to_string(output_file).expect("Failed to read output file");
+
+    assert_eq!(output_content.trim(), r#"["spam"]"#);
 }
 
 #[test]