From a59fc4890ffc467a5ae840e605eed5c1841c324a Mon Sep 17 00:00:00 2001
From: Yisroel Baum <yisroel.d.baum@gmail.com>
Date: Wed, 6 May 2026 22:15:49 +0300
Subject: [PATCH] implement ListCommentsForPost use case

Renames seed() helper to seedComment() to avoid clashing with
Illuminate\Foundation\Testing\TestCase::seed().
---
 .../ListCommentsForPost.php                   | 28 +++++++++++++++++++
 .../ListCommentsForPostRequest.php            | 10 +++++++
 .../UseCases/ListCommentsForPostTest.php      |  8 +++---
 3 files changed, 42 insertions(+), 4 deletions(-)
 create mode 100644 backend/app/Comment/UseCases/ListCommentsForPost/ListCommentsForPost.php
 create mode 100644 backend/app/Comment/UseCases/ListCommentsForPost/ListCommentsForPostRequest.php

diff --git a/backend/app/Comment/UseCases/ListCommentsForPost/ListCommentsForPost.php b/backend/app/Comment/UseCases/ListCommentsForPost/ListCommentsForPost.php
new file mode 100644
index 0000000..13cf6c4
--- /dev/null
+++ b/backend/app/Comment/UseCases/ListCommentsForPost/ListCommentsForPost.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Comment\UseCases\ListCommentsForPost;
+
+use App\Comment\Comment;
+use App\Comment\CommentRepository;
+use App\Exceptions\BadRequestException;
+
+class ListCommentsForPost
+{
+    public function __construct(
+        private CommentRepository $commentRepo,
+    ) {}
+
+    /**
+     * @return Comment[]
+     *
+     * @throws BadRequestException
+     */
+    public function execute(ListCommentsForPostRequest $request): array
+    {
+        if ($request->postId <= 0) {
+            throw new BadRequestException('postId must be positive');
+        }
+
+        return $this->commentRepo->findByPostId($request->postId);
+    }
+}
diff --git a/backend/app/Comment/UseCases/ListCommentsForPost/ListCommentsForPostRequest.php b/backend/app/Comment/UseCases/ListCommentsForPost/ListCommentsForPostRequest.php
new file mode 100644
index 0000000..6f53289
--- /dev/null
+++ b/backend/app/Comment/UseCases/ListCommentsForPost/ListCommentsForPostRequest.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Comment\UseCases\ListCommentsForPost;
+
+class ListCommentsForPostRequest
+{
+    public function __construct(
+        public int $postId,
+    ) {}
+}
diff --git a/backend/tests/Unit/Comment/UseCases/ListCommentsForPostTest.php b/backend/tests/Unit/Comment/UseCases/ListCommentsForPostTest.php
index b69a25e..7ed8918 100644
--- a/backend/tests/Unit/Comment/UseCases/ListCommentsForPostTest.php
+++ b/backend/tests/Unit/Comment/UseCases/ListCommentsForPostTest.php
@@ -29,7 +29,7 @@ class ListCommentsForPostTest extends TestCase
         $this->useCase = new ListCommentsForPost($this->commentRepo);
     }
 
-    private function seed(int $postId, string $body, string $offset): void
+    private function seedComment(int $postId, string $body, string $offset): void
     {
         $this->commentRepo->create(new CreateCommentDto(
             postId: $postId,
@@ -58,9 +58,9 @@ class ListCommentsForPostTest extends TestCase
 
     public function test_returns_only_comments_for_given_post(): void
     {
-        $this->seed(1, 'first', '+0 seconds');
-        $this->seed(2, 'other-post', '+0 seconds');
-        $this->seed(1, 'second', '+1 minute');
+        $this->seedComment(1, 'first', '+0 seconds');
+        $this->seedComment(2, 'other-post', '+0 seconds');
+        $this->seedComment(1, 'second', '+1 minute');
 
         $result = $this->useCase->execute(new ListCommentsForPostRequest(
             postId: 1,