split set update tests

backend/tests/Unit/Set/UseCases/UpdateDescriptionTest.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Tests\Unit\Set\UseCases;
+
+use App\Exceptions\BadRequestException;
+use App\Set\CreateSetDto;
+use App\Set\Set as DomainSet;
+use App\Set\UseCases\UpdateSet\UpdateDescription;
+use App\Set\UseCases\UpdateSet\UpdateDescriptionRequest;
+use Tests\Fakes\FakeSetRepository;
+use Tests\TestCase;
+
+class UpdateDescriptionTest extends TestCase
+{
+    private FakeSetRepository $setRepository;
+
+    protected function setUp(): void
+    {
+        $this->setRepository = new FakeSetRepository();
+    }
+
+    public function testUpdatesOnlyDescription(): void
+    {
+        $set = $this->createSet();
+        $updateDescription = new UpdateDescription($this->setRepository);
+
+        $updatedSet = $updateDescription->execute(
+            new UpdateDescriptionRequest(
+                id: $set->getId(),
+                description: 'Updated set description',
+            )
+        );
+
+        $this->assertSame(
+            'Updated set description',
+            $updatedSet->getDescription(),
+        );
+        $this->assertSame($set->getName(), $updatedSet->getName());
+        $this->assertSame(
+            $set->getIconImageUrl(),
+            $updatedSet->getIconImageUrl(),
+        );
+    }
+
+    public function testRejectsBlankDescription(): void
+    {
+        $set = $this->createSet();
+        $updateDescription = new UpdateDescription($this->setRepository);
+
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('description is required');
+
+        $updateDescription->execute(new UpdateDescriptionRequest(
+            id: $set->getId(),
+            description: '',
+        ));
+    }
+
+    private function createSet(): DomainSet
+    {
+        return $this->setRepository->create(new CreateSetDto(
+            name: 'Original Set',
+            description: 'Original set description',
+            iconImageUrl: 'set-icons/original.png',
+        ));
+    }
+}