Add extensive controller and model tests

tests/Feature/UserSettingControllerTest.php

@@ -0,0 +1,63 @@
+<?php
+
+use App\Models\User;
+use App\Models\UserSetting;
+use Laravel\Sanctum\Sanctum;
+
+it('lists user settings with optional key filter', function (): void {
+    $user = User::factory()->create();
+    $other = User::factory()->create();
+
+    UserSetting::create([
+        'user_id' => $user->id,
+        'key' => 'editor',
+        'value' => ['theme' => 'dark'],
+    ]);
+
+    UserSetting::create([
+        'user_id' => $user->id,
+        'key' => 'notifications',
+        'value' => ['email' => true],
+    ]);
+
+    UserSetting::create([
+        'user_id' => $other->id,
+        'key' => 'editor',
+        'value' => ['theme' => 'light'],
+    ]);
+
+    Sanctum::actingAs($user);
+    $response = $this->getJson('/api/user-settings');
+
+    $response->assertOk();
+    $response->assertJsonCount(2);
+
+    $response = $this->getJson('/api/user-settings?key=editor');
+    $response->assertOk();
+    $response->assertJsonCount(1);
+    $response->assertJsonFragment(['key' => 'editor']);
+});
+
+it('creates or updates user settings', function (): void {
+    $user = User::factory()->create();
+    Sanctum::actingAs($user);
+
+    $response = $this->postJson('/api/user-settings', [
+        'key' => 'editor',
+        'value' => ['theme' => 'dark'],
+    ]);
+
+    $response->assertOk();
+    $response->assertJsonFragment(['key' => 'editor']);
+
+    $response = $this->postJson('/api/user-settings', [
+        'key' => 'editor',
+        'value' => ['theme' => 'light'],
+    ]);
+
+    $response->assertOk();
+    $this->assertDatabaseHas('user_settings', [
+        'user_id' => $user->id,
+        'key' => 'editor',
+    ]);
+});