diff --git a/src/init.rs b/src/init.rs
index e7bc50f..3e7e027 100644
--- a/src/init.rs
+++ b/src/init.rs
@@ -1,12 +1,15 @@
 //
 use crate::model::Config;
 use crate::patterns::{issue_pattern, marker_pattern};
+use crate::printer::Printer;
 use anyhow::{Context, Result};
+use kxio::fs;
+use kxio::network::Network;
 
-pub fn init_config(net: kxio::network::Network) -> Result<Config, anyhow::Error> {
+pub fn init_config(printer: &impl Printer, net: Network) -> Result<Config> {
     let config = Config::builder()
         .net(net)
-        .fs(kxio::fs::new(
+        .fs(fs::new(
             std::env::var("GITHUB_WORKSPACE")
                 .context("GITHUB_WORKSPACE")?
                 .into(),
@@ -18,9 +21,9 @@ pub fn init_config(net: kxio::network::Network) -> Result<Config, anyhow::Error>
         .maybe_auth_token(std::env::var("REPO_TOKEN").ok())
         .build();
 
-    println!("Repo: {}", config.repo());
-    println!("Prefix: {}", config.prefix_pattern());
-    println!("Issues: {}", config.issue_pattern());
+    printer.println(format!("Repo: {}", config.repo()));
+    printer.println(format!("Prefix: {}", config.prefix_pattern()));
+    printer.println(format!("Issues: {}", config.issue_pattern()));
 
     Ok(config)
 }
diff --git a/src/main.rs b/src/main.rs
index bd0757c..fc3587c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,12 +2,15 @@
 use anyhow::{bail, Result};
 use init::init_config;
 use issues::fetch_open_issues;
+use kxio::network::Network;
+use printer::Printer;
 use scanner::{find_markers, DefaultFileScanner};
 
 mod init;
 mod issues;
 mod model;
 mod patterns;
+mod printer;
 mod scanner;
 
 #[cfg(test)]
@@ -16,13 +19,15 @@ mod tests;
 #[tokio::main]
 #[cfg(not(tarpaulin_include))]
 async fn main() -> std::result::Result<(), Box<dyn std::error::Error>> {
-    Ok(run(kxio::network::Network::new_real()).await?)
+    use printer::StandardPrinter;
+
+    Ok(run(&StandardPrinter, Network::new_real()).await?)
 }
 
-async fn run(net: kxio::network::Network) -> Result<()> {
-    println!("Forgejo TODO Checker!");
+async fn run(printer: &impl Printer, net: Network) -> Result<()> {
+    printer.println("Forgejo TODO Checker!");
 
-    let config = init_config(net)?;
+    let config = init_config(printer, net)?;
     let issues = fetch_open_issues(&config).await?;
     let markers = find_markers(&config, issues, &DefaultFileScanner)?;
 
@@ -30,7 +35,7 @@ async fn run(net: kxio::network::Network) -> Result<()> {
     for marker in (*markers).iter() {
         match marker {
             model::Marker::Closed(_, _) | model::Marker::Invalid(_) => {
-                println!("{marker}");
+                printer.println("{marker}");
                 errors = true;
             }
             model::Marker::Unmarked | model::Marker::Valid(_, _) => {}
diff --git a/src/printer.rs b/src/printer.rs
new file mode 100644
index 0000000..fce09b1
--- /dev/null
+++ b/src/printer.rs
@@ -0,0 +1,11 @@
+//
+pub trait Printer {
+    fn println(&self, message: impl Into<String>);
+}
+
+pub struct StandardPrinter;
+impl Printer for StandardPrinter {
+    fn println(&self, message: impl Into<String>) {
+        println!("{}", message.into());
+    }
+}
diff --git a/src/tests/init.rs b/src/tests/init.rs
index 9e61a70..487c9ab 100644
--- a/src/tests/init.rs
+++ b/src/tests/init.rs
@@ -2,8 +2,10 @@
 use super::*;
 
 use assert2::let_assert;
+use kxio::network::Network;
 use model::Config;
 use patterns::{issue_pattern, marker_pattern};
+use printer::TestPrinter;
 
 #[test]
 fn init_when_all_valid() -> anyhow::Result<()> {
@@ -13,7 +15,8 @@ fn init_when_all_valid() -> anyhow::Result<()> {
     std::env::set_var("GITHUB_WORKSPACE", fs.base());
     std::env::set_var("GITHUB_REPOSITORY", "repo");
     std::env::set_var("GITHUB_SERVER_URL", "server");
-    let net = kxio::network::Network::new_mock();
+    let net = Network::new_mock();
+    let printer = TestPrinter::default();
     let expected = Config::builder()
         .net(net.clone())
         .fs(kxio::fs::new(fs.base().to_path_buf()))
@@ -25,7 +28,7 @@ fn init_when_all_valid() -> anyhow::Result<()> {
         .build();
 
     //when
-    let result = init_config(net)?;
+    let result = init_config(&printer, net)?;
 
     //then
     assert_eq!(result.fs().base(), expected.fs().base());
@@ -50,9 +53,10 @@ fn init_when_no_workspace() -> anyhow::Result<()> {
     std::env::remove_var("GITHUB_WORKSPACE");
     std::env::set_var("GITHUB_REPOSITORY", "repo");
     std::env::set_var("GITHUB_SERVER_URL", "server");
+    let printer = TestPrinter::default();
 
     //when
-    let result = init_config(kxio::network::Network::new_mock());
+    let result = init_config(&printer, Network::new_mock());
 
     //then
     let_assert!(Err(e) = result);
@@ -69,9 +73,10 @@ fn init_when_no_repository() -> anyhow::Result<()> {
     std::env::set_var("GITHUB_WORKSPACE", fs.base());
     std::env::remove_var("GITHUB_REPOSITORY");
     std::env::set_var("GITHUB_SERVER_URL", "server");
+    let printer = TestPrinter::default();
 
     //when
-    let result = init_config(kxio::network::Network::new_mock());
+    let result = init_config(&printer, Network::new_mock());
 
     //then
     let_assert!(Err(e) = result);
@@ -88,9 +93,10 @@ fn init_when_no_server_url() -> anyhow::Result<()> {
     std::env::set_var("GITHUB_WORKSPACE", fs.base());
     std::env::set_var("GITHUB_REPOSITORY", "repo");
     std::env::remove_var("GITHUB_SERVER_URL");
+    let printer = TestPrinter::default();
 
     //when
-    let result = init_config(kxio::network::Network::new_mock());
+    let result = init_config(&printer, Network::new_mock());
 
     //then
     let_assert!(Err(e) = result);
diff --git a/src/tests/mod.rs b/src/tests/mod.rs
index c477d4f..35ea1f9 100644
--- a/src/tests/mod.rs
+++ b/src/tests/mod.rs
@@ -1,12 +1,13 @@
+//
+use super::*;
+
 use std::sync::{LazyLock, Mutex};
 
 use model::Config;
 use patterns::{issue_pattern, marker_pattern};
 
-//
-use super::*;
-
 mod init;
+mod printer;
 mod run;
 mod scanner;
 
diff --git a/src/tests/printer.rs b/src/tests/printer.rs
new file mode 100644
index 0000000..21db2d3
--- /dev/null
+++ b/src/tests/printer.rs
@@ -0,0 +1,14 @@
+//
+use std::cell::RefCell;
+
+use crate::printer::Printer;
+
+#[derive(Default)]
+pub struct TestPrinter {
+    pub messages: RefCell<Vec<String>>,
+}
+impl Printer for TestPrinter {
+    fn println(&self, message: impl Into<String>) {
+        self.messages.borrow_mut().push(message.into());
+    }
+}
diff --git a/src/tests/run.rs b/src/tests/run.rs
index e97a108..295d143 100644
--- a/src/tests/run.rs
+++ b/src/tests/run.rs
@@ -4,6 +4,7 @@ use super::*;
 use anyhow::Result;
 use kxio::network::{RequestBody, RequestMethod, SavedRequest, StatusCode};
 use pretty_assertions::assert_eq;
+use printer::TestPrinter;
 
 #[tokio::test]
 async fn run_with_some_invalids() -> Result<()> {
@@ -29,7 +30,7 @@ async fn run_with_some_invalids() -> Result<()> {
     std::env::set_var("GITHUB_SERVER_URL", "https://git.kemitix.net");
 
     //when
-    let result = run(net.clone().into()).await;
+    let result = run(&TestPrinter::default(), net.clone().into()).await;
 
     //then
     assert!(result.is_err()); // there is an invalid file
@@ -66,7 +67,7 @@ async fn run_with_no_invalids() -> Result<()> {
     std::env::set_var("GITHUB_SERVER_URL", "https://git.kemitix.net");
 
     //when
-    let result = run(net.clone().into()).await;
+    let result = run(&TestPrinter::default(), net.clone().into()).await;
 
     //then
     assert!(result.is_ok()); // there is an invalid file