diff --git a/src/graph/Node.java b/src/abstractions/Node.java
similarity index 97%
rename from src/graph/Node.java
rename to src/abstractions/Node.java
index c6bb444..7d70ef4 100644
--- a/src/graph/Node.java
+++ b/src/abstractions/Node.java
@@ -1,12 +1,12 @@
-package graph;
+package abstractions;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public abstract class Node<T extends Comparable<T>> {
+    protected final List<Node<T>> children;
     protected T value;
     protected Node<T> parent;
-    protected final List<Node<T>> children;
 
     public Node(Node<T> parent, T value) {
         this.value = value;
diff --git a/src/graph/Tree.java b/src/abstractions/Tree.java
similarity index 90%
rename from src/graph/Tree.java
rename to src/abstractions/Tree.java
index 9630a08..e6178e5 100644
--- a/src/graph/Tree.java
+++ b/src/abstractions/Tree.java
@@ -1,4 +1,4 @@
-package graph;
+package abstractions;
 
 import java.util.ArrayList;
 import java.util.HashSet;
@@ -28,8 +28,12 @@ public abstract class Tree<T extends Comparable<T>> {
     }
 
     public abstract Node<T> addNode(T value);
+
     public abstract boolean removeNode(T value);
-    public abstract boolean removeNode (Node<T> n);
+
+    public abstract boolean removeNode(Node<T> n);
+
     public abstract Node<T> findNode(T value);
+
     public abstract String toString();
 }
diff --git a/src/binarytree/BinaryTree.java b/src/binarytree/BinaryTree.java
index 41d0b60..61d57eb 100644
--- a/src/binarytree/BinaryTree.java
+++ b/src/binarytree/BinaryTree.java
@@ -1,7 +1,7 @@
 package binarytree;
 
-import graph.Node;
-import graph.Tree;
+import abstractions.Node;
+import abstractions.Tree;
 
 import java.util.ArrayDeque;
 import java.util.ArrayList;
@@ -68,7 +68,7 @@ public class BinaryTree<T extends Comparable<T>> extends Tree<T> {
         this.values.remove(value);
         this.nodes.remove(node);
 
-        if(node.getParent() != null) {
+        if (node.getParent() != null) {
             node.getParent().getChildren().remove(node);
             this.nodes.remove(node);
         } else { // if the value had no parent, it was the root node
@@ -82,7 +82,7 @@ public class BinaryTree<T extends Comparable<T>> extends Tree<T> {
         // it could happen that we have removed the root node and set the first child to be the new root
         // if so, only reintroduce the other children, omitting the first one
         int start = 0;
-        if(node.getParent() == null) {
+        if (node.getParent() == null) {
             start = 1;
         }
 
@@ -154,12 +154,12 @@ public class BinaryTree<T extends Comparable<T>> extends Tree<T> {
 
     @Override
     public String toString() {
-        if(nodes.size() == 0) {
+        if (nodes.size() == 0) {
             return "Empty";
         }
 
         StringBuilder sb = new StringBuilder();
-        for(Node<T> n : nodes) {
+        for (Node<T> n : nodes) {
             sb.append(n.toString());
         }
 
diff --git a/src/binarytree/BinaryTreeNode.java b/src/binarytree/BinaryTreeNode.java
index a1eb26e..518f1d8 100644
--- a/src/binarytree/BinaryTreeNode.java
+++ b/src/binarytree/BinaryTreeNode.java
@@ -1,6 +1,6 @@
 package binarytree;
 
-import graph.Node;
+import abstractions.Node;
 
 import java.util.Random;
 
@@ -68,7 +68,7 @@ public class BinaryTreeNode<T extends Comparable<T>> extends Node<T> {
         StringBuilder sb = new StringBuilder();
         sb.append(String.format("BT(%s)", value));
 
-        for(Node<T> child : children) {
+        for (Node<T> child : children) {
             sb.append(":");
             sb.append(child.toString());
         }
diff --git a/tests/BinaryTreeTests.java b/tests/BinaryTreeTests.java
index b36be50..2267734 100644
--- a/tests/BinaryTreeTests.java
+++ b/tests/BinaryTreeTests.java
@@ -1,6 +1,6 @@
 import binarytree.BinaryTree;
 import binarytree.BinaryTreeNode;
-import graph.Node;
+import abstractions.Node;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
@@ -36,11 +36,6 @@ public class BinaryTreeTests {
         Assert.assertEquals(4, tree.getSize());
     }
 
-    @Test
-    public void testAddition3() {
-        Node<Integer> n1 = new BinaryTreeNode<>(null, 1);
-    }
-
     @Test
     public void testRemoval() {
         tree.addNode(1);