diff --git a/template/day-n/Cargo.toml b/template/day-n/Cargo.toml
index 20c5d95..8135e28 100644
--- a/template/day-n/Cargo.toml
+++ b/template/day-n/Cargo.toml
@@ -10,3 +10,8 @@ repository.workspace = true
 [dependencies]
 nom = { workspace = true }
 itertools = {workspace = true }
+error-stack = {workspace = true}
+
+[dev-dependencies]
+test-log = {workspace=true}
+
diff --git a/template/day-n/src/main.rs b/template/day-n/src/main.rs
index 07ab7f3..bd05632 100644
--- a/template/day-n/src/main.rs
+++ b/template/day-n/src/main.rs
@@ -5,8 +5,8 @@ use {{crate_name}}::part2;
 
 fn main() {
     let input = include_str!("./input.txt");
-    let part1_result = part1(input);
+    let part1_result = part1(input).expect("part 1 should have no error");
     println!("part 1: {part1_result}");
-    let part2_result = part2(input);
+    let part2_result = part2(input).expect("part 2 should have no error");
     println!("part 2: {part2_result}");
 }
diff --git a/template/day-n/src/part1.rs b/template/day-n/src/part1.rs
index a7db908..74c80b9 100644
--- a/template/day-n/src/part1.rs
+++ b/template/day-n/src/part1.rs
@@ -1,8 +1,23 @@
 #![warn(clippy::all, clippy::pedantic)]
 
-#[must_use]
-pub fn part1 (_input: &str) -> String {
-    "Not Finished".to_string()
+use std::fmt::Display;
+
+use error_stack::{Context, Result};
+
+// {{project-name}}
+#[derive(Debug)]
+pub struct {{project-name|upper_camel_case}}Part1Error;
+
+impl Context for {{project-name|upper_camel_case}}Part1Error {}
+
+impl Display for {{project-name|upper_camel_case}}Part1Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "day 1 part 1 error")
+    }
+}
+
+pub fn part1 (_input: &str) -> Result<String, {{project-name|upper_camel_case}}Part1Error> {
+    Ok("Not Finished".to_string())
 }
 
 #[cfg(test)]
@@ -11,9 +26,10 @@ mod test {
 
     const INPUT: &str = "";
 
-    #[test]
+    #[test_log::test]
+    #[test_log(default_log_filter = "trace")]
     fn part1_works() {
-        let result = part1(INPUT);
+        let result = part1(INPUT).unwrap();
         assert_eq!(result, "Not Finished".to_string());
     }
 }
diff --git a/template/day-n/src/part2.rs b/template/day-n/src/part2.rs
index 8f15571..5169fc1 100644
--- a/template/day-n/src/part2.rs
+++ b/template/day-n/src/part2.rs
@@ -1,8 +1,22 @@
 #![warn(clippy::all, clippy::pedantic)]
 
-#[must_use]
-pub fn part2 (_input: &str) -> String {
-    "Not Finished".to_string()
+use std::fmt::Display;
+
+use error_stack::{Context, Result};
+
+#[derive(Debug)]
+pub struct {{ project-name | upper_camel_case }}Part2Error;
+
+impl Context for {{ project-name | upper_camel_case }}Part2Error {}
+
+impl Display for {{ project-name | upper_camel_case }}Part2Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "day 1 part 1 error")
+    }
+}
+
+pub fn part2 (_input: &str) -> Result<String, {{ project-name | upper_camel_case }}Part2Error> {
+    Ok("Not Finished".to_string())
 }
 
 #[cfg(test)]
@@ -11,9 +25,10 @@ mod test {
 
     const INPUT: &str = "";
 
-    #[test]
+    #[test_log::test]
+    #[test_log(default_log_filter = "trace")]
     fn part2_works() {
-        let result = part2(INPUT);
+        let result = part2(INPUT).unwrap();
         assert_eq!(result, "Not Finished".to_string());
     }
 }