diff --git a/src/app/socket.service.spec.ts b/src/app/socket.service.spec.ts
new file mode 100644
index 0000000..d337a44
--- /dev/null
+++ b/src/app/socket.service.spec.ts
@@ -0,0 +1,8 @@
+import { SocketService } from './socket.service';
+
+describe('SocketService.generateHex', () => {
+  it('should return a hex color string', () => {
+    const hex = SocketService.generateHex();
+    expect(hex).toMatch(/^#[0-9A-F]{6}$/);
+  });
+});