diff --git a/Cargo.toml b/Cargo.toml
index 73af855..c2ad355 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ members = [
 anyhow = "1.0.66"
 # A dead simple ANSI terminal color painting library.
 yansi = "1.0.0-gamma"
-itertools = "0.11.0"
+itertools = "0.12.0"
 # An implementation of regular expressions for Rust. This implementation uses finite automata …
 regex = "1.7.0"
 # Pathfinding, flow, and graph algorithms
diff --git a/day1/src/lib.rs b/day1/src/lib.rs
index 61b37c4..45cb56f 100644
--- a/day1/src/lib.rs
+++ b/day1/src/lib.rs
@@ -31,3 +31,11 @@ impl<T: std::io::Read> TryFrom<BufReader<T>> for Solution {
         Ok(solution)
     }
 }
+
+#[cfg(test)]
+mod test {
+    #[test]
+    fn stub() {
+        assert_eq!(1 + 1, 2);
+    }
+}
diff --git a/template/src/lib.rs b/template/src/lib.rs
index 61b37c4..0f04e01 100644
--- a/template/src/lib.rs
+++ b/template/src/lib.rs
@@ -31,3 +31,10 @@ impl<T: std::io::Read> TryFrom<BufReader<T>> for Solution {
         Ok(solution)
     }
 }
+#[cfg(test)]
+mod test {
+    #[test]
+    fn stub() {
+        assert_eq!(1 + 1, 2);
+    }
+}
diff --git a/utils/src/graph.rs b/utils/src/graph.rs
index 8689b31..4206465 100644
--- a/utils/src/graph.rs
+++ b/utils/src/graph.rs
@@ -1,8 +1,10 @@
-use std::cmp::Eq;
+use std::cmp::{Eq, PartialOrd};
 use std::collections::{HashMap, HashSet, VecDeque};
 use std::fmt::Debug;
 use std::hash::Hash;
+use std::iter::Iterator;
 use std::marker::Copy;
+use std::ops::Add;
 use tracing::debug;
 
 fn breadth_first_search_build_path<'a, N>(
@@ -71,6 +73,8 @@ where
     None
 }
 
+use tracing::debug;
+
 pub fn dijkstra<N, IS, IE, GN, NEIGH, R>(
     nodes: &Vec<N>,
     initial_score: IS,
@@ -82,8 +86,8 @@ where
     GN: Fn(&N) -> NEIGH,
     IE: Fn(&N) -> bool,
     N: Debug + Eq + Copy + Hash,
-    R: Debug + std::cmp::PartialOrd + Copy + std::ops::Add<Output = R> + HasOne,
-    NEIGH: std::iter::Iterator<Item = N>,
+    R: Debug + PartialOrd + Copy + Add<Output = R> + HasOne,
+    NEIGH: Iterator<Item = N>,
 {
     let mut scores = HashMap::new();
     for node in nodes {