diff --git a/tests/Unit/ScheduledNode/UseCases/GetTodaysScheduleTest.php b/tests/Unit/ScheduledNode/UseCases/GetTodaysScheduleTest.php
index 0878867..207a33c 100644
--- a/tests/Unit/ScheduledNode/UseCases/GetTodaysScheduleTest.php
+++ b/tests/Unit/ScheduledNode/UseCases/GetTodaysScheduleTest.php
@@ -124,4 +124,15 @@ class GetTodaysScheduleTest extends TestCase
             userId: 0,
         ));
     }
+
+    public function test_throws_if_user_id_is_null(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('userId is required');
+
+        $this->useCase->execute(new GetTodaysScheduleRequest(
+            date: '2025-01-02',
+            userId: null,
+        ));
+    }
 }