diff --git a/packages/core/src/events/types.test.ts b/packages/core/src/events/types.test.ts
new file mode 100644
index 00000000..8f95742a
--- /dev/null
+++ b/packages/core/src/events/types.test.ts
@@ -0,0 +1,51 @@
+import { describe, it, expect } from 'vitest';
+import { createKeyEvent } from './types.js';
+
+describe('createKeyEvent', () => {
+    it('constructs a KeyEvent with correct base properties', () => {
+        const rawBuffer = Buffer.from('a');
+        const event = createKeyEvent({
+            key: 'a',
+            raw: rawBuffer,
+            ctrl: false,
+            alt: true,
+            shift: false,
+            targetId: 'my-widget'
+        });
+
+        expect(event.key).toBe('a');
+        expect(event.raw).toBe(rawBuffer);
+        expect(event.ctrl).toBe(false);
+        expect(event.alt).toBe(true);
+        expect(event.shift).toBe(false);
+        expect(event.targetId).toBe('my-widget');
+        expect(event._propagationStopped).toBe(false);
+        expect(event._defaultPrevented).toBe(false);
+    });
+
+    it('sets _propagationStopped to true when stopPropagation is called', () => {
+        const event = createKeyEvent({
+            key: 'enter',
+            raw: Buffer.alloc(0),
+            ctrl: false,
+            alt: false,
+            shift: false
+        });
+
+        event.stopPropagation();
+        expect(event._propagationStopped).toBe(true);
+    });
+
+    it('sets _defaultPrevented to true when preventDefault is called', () => {
+        const event = createKeyEvent({
+            key: 'escape',
+            raw: Buffer.alloc(0),
+            ctrl: false,
+            alt: false,
+            shift: false
+        });
+
+        event.preventDefault();
+        expect(event._defaultPrevented).toBe(true);
+    });
+});