test set elements

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

@@ -0,0 +1,171 @@
+<?php
+
+namespace Tests\Unit\Element\UseCases;
+
+use App\Element\Element;
+use App\Element\UseCases\CreateElement\CreateElement;
+use App\Element\UseCases\CreateElement\CreateElementRequest;
+use App\Exceptions\BadRequestException;
+use App\Set\CreateSetDto;
+use DomainException;
+use Tests\Fakes\FakeElementRepository;
+use Tests\Fakes\FakeSetRepository;
+use Tests\TestCase;
+
+class CreateElementTest extends TestCase
+{
+    private FakeSetRepository $setRepo;
+
+    private FakeElementRepository $elementRepo;
+
+    private CreateElement $createElement;
+
+    protected function setUp(): void
+    {
+        $this->setRepo = new FakeSetRepository();
+        $this->elementRepo = new FakeElementRepository();
+        $this->createElement = new CreateElement(
+            $this->elementRepo,
+            $this->setRepo,
+        );
+    }
+
+    public function testCreatesRootElement(): void
+    {
+        $set = $this->setRepo->create(new CreateSetDto('Daily learning'));
+
+        $element = $this->createElement->execute(new CreateElementRequest(
+            setId: $set->getId(),
+            title: 'Root',
+            parentElementId: null,
+        ));
+
+        $this->assertInstanceOf(Element::class, $element);
+        $this->assertSame('Root', $element->getTitle());
+        $this->assertSame($set->getId(), $element->getSet()->getId());
+        $this->assertNull($element->getParentElement());
+    }
+
+    public function testCreatesChildElement(): void
+    {
+        $set = $this->setRepo->create(new CreateSetDto('Daily learning'));
+        $rootElement = $this->createElement->execute(
+            new CreateElementRequest(
+                setId: $set->getId(),
+                title: 'Root',
+                parentElementId: null,
+            )
+        );
+
+        $childElement = $this->createElement->execute(
+            new CreateElementRequest(
+                setId: $set->getId(),
+                title: 'Child',
+                parentElementId: $rootElement->getId(),
+            )
+        );
+
+        $this->assertSame('Child', $childElement->getTitle());
+        $this->assertSame(
+            $rootElement->getId(),
+            $childElement->getParentElement()->getId(),
+        );
+    }
+
+    public function testThrowsWhenSetIdMissing(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('setId is required');
+
+        $this->createElement->execute(new CreateElementRequest(
+            setId: null,
+            title: 'Root',
+            parentElementId: null,
+        ));
+    }
+
+    public function testThrowsWhenTitleMissing(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('title is required');
+
+        $this->createElement->execute(new CreateElementRequest(
+            setId: 1,
+            title: null,
+            parentElementId: null,
+        ));
+    }
+
+    public function testThrowsWhenSetDoesNotExist(): void
+    {
+        $this->expectException(DomainException::class);
+        $this->expectExceptionMessage('Set with id: 99 doesnt exist');
+
+        $this->createElement->execute(new CreateElementRequest(
+            setId: 99,
+            title: 'Root',
+            parentElementId: null,
+        ));
+    }
+
+    public function testThrowsWhenParentElementDoesNotExist(): void
+    {
+        $set = $this->setRepo->create(new CreateSetDto('Daily learning'));
+
+        $this->expectException(DomainException::class);
+        $this->expectExceptionMessage(
+            'Element with id: 99 doesnt exist'
+        );
+
+        $this->createElement->execute(new CreateElementRequest(
+            setId: $set->getId(),
+            title: 'Child',
+            parentElementId: 99,
+        ));
+    }
+
+    public function testThrowsWhenRootElementAlreadyExists(): void
+    {
+        $set = $this->setRepo->create(new CreateSetDto('Daily learning'));
+        $this->createElement->execute(new CreateElementRequest(
+            setId: $set->getId(),
+            title: 'Root',
+            parentElementId: null,
+        ));
+
+        $this->expectException(DomainException::class);
+        $this->expectExceptionMessage(
+            'A root element already exists for this set'
+        );
+
+        $this->createElement->execute(new CreateElementRequest(
+            setId: $set->getId(),
+            title: 'Another root',
+            parentElementId: null,
+        ));
+    }
+
+    public function testThrowsWhenParentBelongsToAnotherSet(): void
+    {
+        $parentSet = $this->setRepo->create(new CreateSetDto('Parent set'));
+        $childSet = $this->setRepo->create(new CreateSetDto('Child set'));
+        $parentElement = $this->createElement->execute(
+            new CreateElementRequest(
+                setId: $parentSet->getId(),
+                title: 'Parent root',
+                parentElementId: null,
+            )
+        );
+
+        $this->expectException(DomainException::class);
+        $this->expectExceptionMessage(
+            'Parent element must belong to the same set'
+        );
+
+        $this->createElement->execute(new CreateElementRequest(
+            setId: $childSet->getId(),
+            title: 'Invalid child',
+            parentElementId: $parentElement->getId(),
+        ));
+    }
+}