diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 1428f89..8daa36d 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -1,4 +1,4 @@
-name: coverage
+name: Coverage
 
 on:
   push:
diff --git a/src/lctree.rs b/src/lctree.rs
index 3c8301a..e984689 100644
--- a/src/lctree.rs
+++ b/src/lctree.rs
@@ -559,4 +559,22 @@ mod tests {
         assert_eq!(lctree.path(4, 3).sum, 15.);
         assert_eq!(lctree.path(5, 7).sum, 9.);
     }
+
+    #[test]
+    pub fn test_extend_forest() {
+        let weights = vec![1.0, 2.0, 3.0];
+        let mut lctree = LinkCutTree::default();
+        let trees_ids = lctree.extend_forest(&weights);
+        assert_eq!(trees_ids, vec![0, 1, 2]);
+    }
+
+    #[test]
+    #[should_panic]
+    pub fn delete_tree() {
+        let mut lctree = LinkCutTree::default();
+        let alice = lctree.make_tree(0.0);
+        let bob = lctree.make_tree(1.0);
+        lctree.link(alice, bob);
+        lctree.remove_tree(alice); // should panic
+    }
 }
diff --git a/src/node.rs b/src/node.rs
index 1ac6e48..7c27ebc 100644
--- a/src/node.rs
+++ b/src/node.rs
@@ -39,7 +39,7 @@ impl<T: Path> Node<T> {
     }
 
     #[allow(dead_code)]
-    #[cfg_attr(tarpaulin, ignore)]
+    #[cfg(not(tarpaulin_include))]
     pub fn to_str(&self) -> String {
         let parent = match self.parent {
             Parent::Node(idx) => format!("Node({idx})"),
diff --git a/src/splay.rs b/src/splay.rs
index 7e3b377..6aa72a3 100644
--- a/src/splay.rs
+++ b/src/splay.rs
@@ -280,6 +280,55 @@ mod tests {
         forest
     }
 
+    #[test]
+    pub fn create_node() {
+        let mut forest: Forest<FindMax> = super::Forest::new();
+        let alice = forest.create_node(0.0);
+        let bob = forest.create_node(1.0);
+        let charlie = forest.create_node(2.0);
+        assert_eq!([alice, bob, charlie], [0, 1, 2]);
+
+        forest.delete_node(bob);
+        let david = forest.create_node(4.0);
+        // Should reuse the space of bob's tree (which was removed)
+        assert_eq!(david, bob);
+    }
+
+    #[test]
+    #[should_panic]
+    pub fn set_right() {
+        let mut forest: Forest<FindMax> = super::Forest::new();
+        let alice = forest.create_node(0.0);
+        let bob = forest.create_node(1.0);
+        forest.set_right(alice, bob);
+        let charlie = forest.create_node(2.0);
+        // Should panic because alice already has a right child
+        forest.set_right(alice, charlie);
+    }
+
+    #[test]
+    #[should_panic]
+    pub fn set_left() {
+        let mut forest: Forest<FindMax> = super::Forest::new();
+        let alice = forest.create_node(0.0);
+        let bob = forest.create_node(1.0);
+        forest.set_left(alice, bob);
+        let charlie = forest.create_node(2.0);
+        // Should panic because alice already has a left child
+        forest.set_left(alice, charlie);
+    }
+
+    #[test]
+    #[should_panic]
+    pub fn cut_left() {
+        let mut forest: Forest<FindMax> = super::Forest::new();
+        let alice = forest.create_node(0.0);
+        let bob = forest.create_node(1.0);
+        forest.set_left(alice, bob);
+        // Should panic because alice does not have a left child
+        forest.cut_left(bob);
+    }
+
     #[test]
     pub fn rotate_left_root() {
         // form the following tree and rotate left on '0':