test explicit set levels

backend/tests/Feature/Set/EloquentSetLevelRepositoryTest.php

@@ -0,0 +1,92 @@
+<?php
+
+namespace Tests\Feature\Set;
+
+use App\Set\CreateSetDto;
+use App\Set\CreateSetLevelDto;
+use App\Set\Set;
+use App\Set\SetLevelRepository;
+use App\Set\SetRepository;
+use App\Shared\ValueObject\EmailAddress;
+use App\User\CreateUserDto;
+use App\User\UserRepository;
+use DomainException;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class EloquentSetLevelRepositoryTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function testItCreatesOrderedLevelsWithinEachSet(): void
+    {
+        $bible = $this->createSet('Bible');
+        $course = $this->createSet('Course');
+        $repository = app(SetLevelRepository::class);
+
+        $book = $repository->create(new CreateSetLevelDto(
+            set: $bible,
+            kind: 'book',
+        ));
+        $portion = $repository->create(new CreateSetLevelDto(
+            set: $bible,
+            kind: 'portion',
+        ));
+        $module = $repository->create(new CreateSetLevelDto(
+            set: $course,
+            kind: 'module',
+        ));
+
+        $this->assertSame(0, $book->getDepth());
+        $this->assertSame(1, $portion->getDepth());
+        $this->assertSame(0, $module->getDepth());
+        $this->assertSame(
+            ['book', 'portion'],
+            array_map(function ($level): string {
+                return $level->getKind();
+            }, $repository->findBySet($bible)),
+        );
+        $this->assertSame(
+            $portion->getId(),
+            $repository->find($portion->getId())?->getId(),
+        );
+        $this->assertDatabaseHas('set_levels', [
+            'set_id' => $bible->getId(),
+            'kind' => 'portion',
+            'depth' => 1,
+        ]);
+    }
+
+    public function testItRejectsARepeatedKindWithinASet(): void
+    {
+        $set = $this->createSet('Bible');
+        $repository = app(SetLevelRepository::class);
+        $repository->create(new CreateSetLevelDto(
+            set: $set,
+            kind: 'book',
+        ));
+
+        $this->expectException(DomainException::class);
+        $this->expectExceptionMessage(
+            'level kind must be unique within set',
+        );
+
+        $repository->create(new CreateSetLevelDto(
+            set: $set,
+            kind: 'book',
+        ));
+    }
+
+    private function createSet(string $name): Set
+    {
+        $user = app(UserRepository::class)->create(new CreateUserDto(
+            email: new EmailAddress(strtolower($name).'@example.com'),
+            passwordHash: 'hashed-password',
+        ));
+
+        return app(SetRepository::class)->create(new CreateSetDto(
+            name: $name,
+            creator: $user,
+        ));
+    }
+}