fixing names

src/__tests__/Stack.ts

@@ -0,0 +1,22 @@
+import Stack from "@code/stack";
+
+test("queue", function() {
+    const list = new Stack<number>();
+
+    list.push(5);
+    list.push(7);
+    list.push(9);
+
+    expect(list.pop()).toEqual(9);
+    expect(list.length).toEqual(2);
+
+    list.push(11);
+    expect(list.pop()).toEqual(11);
+    expect(list.pop()).toEqual(7);
+    expect(list.peek()).toEqual(5);
+    expect(list.pop()).toEqual(5);
+    expect(list.pop()).toEqual(undefined);
+});
+
+
+