diff --git a/lesson_12/structs_ts/src/stack.test.ts b/lesson_12/structs_ts/src/stack.test.ts
new file mode 100644
index 000000000..d52c1a6ae
--- /dev/null
+++ b/lesson_12/structs_ts/src/stack.test.ts
@@ -0,0 +1,40 @@
+import { Stack } from './stack.js';
+
+describe('Stack', () => {
+  test('testPush', () => {
+    const stack = new Stack();
+    stack.push(1);
+    expect(stack.peek()).toBe(1);
+  });
+
+  test('testPop', () => {
+    const stack = new Stack();
+    stack.push(1);
+    stack.push(2);
+    expect(stack.pop()).toBe(2);
+    expect(stack.pop()).toBe(1);
+  });
+
+  test('testTop', () => {
+    const stack = new Stack();
+    stack.push(1);
+    stack.push(2);
+    expect(stack.peek()).toBe(2);
+    stack.pop();
+    expect(stack.peek()).toBe(1);
+  });
+
+  test('testIsEmpty', () => {
+    const stack = new Stack();
+    expect(stack.isEmpty()).toBe(true);
+    stack.push(1);
+    expect(stack.isEmpty()).toBe(false);
+    stack.pop();
+    expect(stack.isEmpty()).toBe(true);
+  });
+
+  test('testTopEmptyStack', () => {
+    const stack = new Stack();
+    expect(() => stack.peek()).toThrow();
+  });
+});