Add messages for test expectations.

Author: Kay Hudson

src/test/java/StackTestCase.java

@@ -4,37 +4,38 @@
 
 import com.galvanize.Stack;
 
-public class StackTestCase {
+class StackTestCase {
 
     @Test()
     @DisplayName("Stack.push() adds a new object")
-    public void testStackPush() {
+    void testStackPush() {
         Stack newStack = new Stack();
-        assertEquals(0, newStack.count());
+        assertEquals(0, newStack.count(),"Stack should be empty on initialization");
         newStack.push(100);
-        assertEquals(1, newStack.count());
-        assertFalse(newStack.empty);
+        assertEquals(1, newStack.count(), "Stack should contain only 1 object.");
+        assertFalse(newStack.empty, "Stack should not be empty.");
     }
 
     @Test
     @DisplayName("Stack.pop() removes and returns last item added.")
-    public void testStackPopRemovesAndReturnsLastItemIn() {
+    void testStackPopRemovesAndReturnsLastItemIn() {
         Stack newStack = new Stack();
         newStack.push(1);
         newStack.push(2);
         newStack.push(3);
-        assertEquals(3, newStack.count());
+        assertEquals(3, newStack.count(), "Stack should contain 3 objects.");
         Object item = newStack.pop();
-        assertEquals(2, newStack.count());
-        assertEquals(3, item);
+        assertEquals(2, newStack.count(), "Stack should contain only 2 items after .pop()");
+        assertEquals(3, item, "The removed object should have a value of 3");
     }
 
     @Test
     @DisplayName("Stack.peek() returns the last item added without removing it.")
-    public void testStackPeek() {
+    void testStackPeek() {
         Stack newStack = new Stack();
         newStack.push("sock");
         newStack.push("shoe");
-        assertEquals("shoe", newStack.peek());
+        assertEquals("shoe", newStack.peek(), "The last object should be 'shoe'.");
+        assertEquals(2, newStack.count(), "The stack size should be unchanged after peek().");
     }
 }