test that only nodes which are not parents are scheduled

tests/Fakes/FakeScheduledNodeRepository.php

@@ -10,8 +10,11 @@ class FakeScheduledNodeRepository implements ScheduledNodeRepository
 {
     private array $existingScheduledNodes = [];
 
+    private int $numberOfTimesCreateCalled = 0;
+
     public function create(CreateScheduledNodeDto $dto): ScheduledNode
     {
+        $this->numberOfTimesCreateCalled++;
         $id = $this->nextId();
         $scheduledNode = new ScheduledNode(
             id: $id,
@@ -33,6 +36,11 @@ class FakeScheduledNodeRepository implements ScheduledNodeRepository
         );
     }
 
+    public function getNumberOfTimesCreateCalled(): int
+    {
+        return $this->numberOfTimesCreateCalled;
+    }
+
     private function nextId(): int
     {
         return count($this->existingScheduledNodes);

tests/Unit/Plan/UseCases/CreatePlanTest.php

@@ -99,4 +99,29 @@ class CreatePlanTest extends TestCase
         ));
         $this->assertNotNull($this->scheduledNodeRepo->find(0));
     }
+
+    public function test_plan_only_schedules_nodes_which_arent_parents(): void
+    {
+        $text = $this->textRepo->create(new CreateTextDto(
+            name: 'testname',
+        ));
+        $rootNode = $this->nodeRepo->create(new CreateNodeDto(
+            text: $text,
+            title: 'root node',
+            parentNode: null,
+        ));
+        $this->nodeRepo->create(new CreateNodeDto(
+            text: $text,
+            title: 'child node',
+            parentNode: $rootNode,
+        ));
+        $plan = $this->useCase->execute(new CreatePlanRequest(
+            userId: 0,
+            name: 'testPlan',
+            textId: 0,
+        ));
+        $this->assertEquals(
+            1, $this->scheduledNodeRepo->getNumberOfTimesCreateCalled()
+        );
+    }
 }