diff --git a/spec/priority_node.js b/spec/priority_node.js
index 73eb5d1..74ed6d2 100644
--- a/spec/priority_node.js
+++ b/spec/priority_node.js
@@ -12,12 +12,25 @@ describe('PriorityNode', () => {
   })
 
   context('getData()', () => {
-    it('returns a string when given detData().', () => {
-      const levelZero = new PriorityNode(
-        {data: "level0", priority: 0}
-      )
+    it('returns the correct type, if string', () => {
+      const levelZero = new PriorityNode({data: "level0", priority: 0})
       const data = levelZero.getData()
       expect(data).to.be.a('string')
     })
+    it('returns the correct value, if a string', () => {
+      const levelZero = new PriorityNode({data: "level0", priority: 0})
+      const data = levelZero.getData()
+      expect(data).to.be.equal('level0')
+    })
+    it('returns the correct type, if number', () => {
+      const levelZero = new PriorityNode({data: 0, priority: 0})
+      const data = levelZero.getData()
+      expect(data).to.be.a('number')
+    })
+    it('returns the correct value, if a number', () => {
+      const levelZero = new PriorityNode({data: 0, priority: 0})
+      const data = levelZero.getData()
+      expect(data).to.be.equal(0)
+    })
   })
 })