Add equality tests.

Author: Kay Hudson

src/main/java/com/galvanize/Node.java

@@ -1,5 +1,7 @@
 package com.galvanize;
 
+import java.util.Objects;
+
 public class Node {
     public Object value;
     private Node next;
@@ -15,4 +17,25 @@ public Node getNext() {
     public void setNext(Node next) {
         this.next = next;
     }
+
+    public Object getValue() {
+        return value;
+    }
+
+    public void setValue(Object value) {
+        this.value = value;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Node node = (Node) o;
+        return Objects.equals(getValue(), node.getValue());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(getValue());
+    }
 }

src/test/java/StackTestCase.java

@@ -46,4 +46,13 @@ void testStackPeekReturnsTopNode() {
     void testStackEmptyTrue() {
         assertTrue(stack.empty);
     }
+
+    @Test
+    void testNodesEqual() {
+        Node treeNode = new Node("Tree");
+        Node node1 = new Node("Tree");
+        assertEquals(treeNode, node1);
+        Node bushNode = new Node("Bush");
+        assertNotEquals(treeNode, bushNode);
+    }
 }