test create plan use case validates null fields

tests/Unit/Plan/UseCases/CreatePlanTest.php

@@ -2,6 +2,7 @@
 
 namespace Tests\Unit\Plan\UseCases;
 
+use App\Exceptions\BadRequestException;
 use App\Node\CreateNodeDto;
 use App\Plan\UseCases\CreatePlan;
 use App\Plan\UseCases\CreatePlanRequest;
@@ -125,4 +126,40 @@ class CreatePlanTest extends TestCase
             $this->scheduledNodeRepo->getNumberOfTimesCreateCalled()
         );
     }
+
+    public function test_throws_if_user_id_is_null(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('userId is required');
+
+        $this->useCase->execute(new CreatePlanRequest(
+            userId: null,
+            name: 'testPlan',
+            textId: 0,
+        ));
+    }
+
+    public function test_throws_if_text_id_is_null(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('textId is required');
+
+        $this->useCase->execute(new CreatePlanRequest(
+            userId: 0,
+            name: 'testPlan',
+            textId: null,
+        ));
+    }
+
+    public function test_throws_if_name_is_null(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('name is required');
+
+        $this->useCase->execute(new CreatePlanRequest(
+            userId: 0,
+            name: null,
+            textId: 0,
+        ));
+    }
 }