adding bonus content for jest

bonus-jest/exercise/src/stack.spec.ts

@@ -0,0 +1,18 @@
+// TODO: Import the stack here
+
+describe('Stack', () => {
+  it('should push item to the top of the stack', () => {
+    // TODO: implement test here:
+    // 1. Instantiate a new Stack - i.e. const stack = new Stack<number>();
+    // 2. Use stack push calls to add some items to the stack
+    // 3. Write assertions via the expect() API
+  });
+
+  it('should pop the item from the top of stack', () => {
+    // TODO: implement test here:
+    // 1. Instantiate a new Stack - i.e. const stack = new Stack<number>();
+    // 2. Use stack push calls to add some items to the stack
+    // 3. pop a few items off the stack
+    // 4. write assertions via the expect() API
+  });
+});