test set layout browsing

backend/tests/Feature/Element/EloquentElementRepositoryTest.php

@@ -156,6 +156,45 @@ class EloquentElementRepositoryTest extends TestCase
         );
     }
 
+    public function testItListsEveryElementForASet(): void
+    {
+        $bible = $this->createSet('Bible');
+        $course = $this->createSet('Course');
+        $repository = app(ElementRepository::class);
+        $genesis = $repository->create(new CreateElementDto(
+            set: $bible,
+            name: 'Genesis',
+            kind: 'book',
+            parentElement: null,
+        ));
+        $repository->create(new CreateElementDto(
+            set: $bible,
+            name: 'Creation',
+            kind: 'portion',
+            parentElement: $genesis,
+        ));
+        $repository->create(new CreateElementDto(
+            set: $course,
+            name: 'Foundations',
+            kind: 'module',
+            parentElement: null,
+        ));
+
+        $elements = $repository->findBySet($bible);
+
+        $this->assertSame(
+            ['Genesis', 'Creation'],
+            array_map(function ($element): string {
+                return $element->getName();
+            }, $elements),
+        );
+        $this->assertNull($elements[0]->getParentElement());
+        $this->assertSame(
+            $genesis->getId(),
+            $elements[1]->getParentElement()?->getId(),
+        );
+    }
+
     private function createSet(string $name): Set
     {
         $creator = app(UserRepository::class)->create(new CreateUserDto(