test get element use case

backend/tests/Unit/Element/UseCases/GetElementTest.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Tests\Unit\Element\UseCases;
+
+use App\Element\CreateElementDto;
+use App\Element\Element;
+use App\Element\UseCases\GetElement\GetElement;
+use App\Element\UseCases\GetElement\GetElementRequest;
+use App\Exceptions\BadRequestException;
+use App\Exceptions\NotFoundException;
+use App\Set\Set as DomainSet;
+use Tests\Fakes\FakeElementRepository;
+use Tests\TestCase;
+
+class GetElementTest extends TestCase
+{
+    private FakeElementRepository $elementRepo;
+
+    private GetElement $getElement;
+
+    protected function setUp(): void
+    {
+        $this->elementRepo = new FakeElementRepository();
+        $this->getElement = new GetElement($this->elementRepo);
+    }
+
+    public function testReturnsElementWhenFound(): void
+    {
+        $element = $this->createElement('Baderech HaAvodah');
+
+        $foundElement = $this->getElement->execute(new GetElementRequest(
+            id: $element->getId(),
+        ));
+
+        $this->assertInstanceOf(Element::class, $foundElement);
+        $this->assertSame($element->getId(), $foundElement->getId());
+        $this->assertSame('Baderech HaAvodah', $foundElement->getTitle());
+    }
+
+    public function testThrowsWhenIdMissing(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('id is required');
+
+        $this->getElement->execute(new GetElementRequest(id: null));
+    }
+
+    public function testThrowsWhenElementDoesNotExist(): void
+    {
+        $this->expectException(NotFoundException::class);
+        $this->expectExceptionMessage('Element not found');
+
+        $this->getElement->execute(new GetElementRequest(id: 999));
+    }
+
+    private function createElement(string $title): Element
+    {
+        $set = new DomainSet(
+            id: 1,
+            name: 'Baderech',
+            description: 'Baderech description',
+            iconImageUrl: '/assets/baderech-icon.png',
+        );
+
+        return $this->elementRepo->create(new CreateElementDto(
+            set: $set,
+            title: $title,
+            parentElement: null,
+        ));
+    }
+}