Initial commit

src/day1/Stack.test.ts

@@ -0,0 +1,25 @@
+import Stack from "@code/Stack";
+
+test("stack", 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);
+
+    // just wanted to make sure that I could not blow up myself when i remove
+    // everything
+    list.push(69);
+    expect(list.peek()).toEqual(69);
+    expect(list.length).toEqual(1);
+});