test sets list endpoint

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

@@ -0,0 +1,40 @@
+<?php
+
+namespace Tests\Unit\Set\UseCases;
+
+use App\Set\CreateSetDto;
+use App\Set\UseCases\ListSets\ListSets;
+use App\Shared\ValueObject\EmailAddress;
+use App\User\User;
+use PHPUnit\Framework\TestCase;
+use Tests\Fakes\FakeSetRepository;
+
+class ListSetsTest extends TestCase
+{
+    public function test_it_lists_every_available_set_alphabetically(): void
+    {
+        $creator = new User(
+            id: 7,
+            email: new EmailAddress('creator@example.com'),
+            passwordHash: 'hashed-password',
+        );
+        $repository = new FakeSetRepository;
+        $repository->create(new CreateSetDto(
+            name: 'Course',
+            creator: $creator,
+        ));
+        $repository->create(new CreateSetDto(
+            name: 'Bible',
+            creator: $creator,
+        ));
+
+        $sets = (new ListSets($repository))->execute();
+
+        $this->assertSame(
+            ['Bible', 'Course'],
+            array_map(function ($set): string {
+                return $set->getName();
+            }, $sets),
+        );
+    }
+}