test Post entity feature slot

backend/tests/Unit/Post/PostTest.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Tests\Unit\Post;
+
+use App\Post\Post;
+use DateTimeImmutable;
+use DateTimeZone;
+use Tests\TestCase;
+
+class PostTest extends TestCase
+{
+    public function test_post_exposes_all_properties(): void
+    {
+        $createdAt = new DateTimeImmutable(
+            '2026-05-06T12:00:00',
+            new DateTimeZone('UTC'),
+        );
+        $post = new Post(
+            id: 7,
+            userId: 3,
+            title: 'Hello',
+            body: 'World',
+            createdAt: $createdAt,
+            featureSlot: 1,
+        );
+
+        $this->assertSame(7, $post->getId());
+        $this->assertSame(3, $post->getUserId());
+        $this->assertSame('Hello', $post->getTitle());
+        $this->assertSame('World', $post->getBody());
+        $this->assertSame($createdAt, $post->getCreatedAt());
+        $this->assertSame(1, $post->getFeatureSlot());
+        $this->assertTrue($post->isFeatured());
+    }
+
+    public function test_post_with_null_feature_slot_is_not_featured(): void
+    {
+        $post = new Post(
+            id: 1,
+            userId: 1,
+            title: 't',
+            body: 'b',
+            createdAt: new DateTimeImmutable('2026-05-06T12:00:00Z'),
+            featureSlot: null,
+        );
+
+        $this->assertNull($post->getFeatureSlot());
+        $this->assertFalse($post->isFeatured());
+    }
+}