diff --git a/app/Http/Controllers/AuthController.php b/app/Http/Controllers/AuthController.php
index f61a35bc..35837542 100644
--- a/app/Http/Controllers/AuthController.php
+++ b/app/Http/Controllers/AuthController.php
@@ -5,7 +5,6 @@ namespace App\Http\Controllers;
 use Log;
 use Mail;
 use View;
-use Utils;
 use Cache;
 use Cookie;
 use Option;
@@ -44,7 +43,7 @@ class AuthController extends Controller
         $user = $users->get($identification, $authType);
 
         // Require CAPTCHA if user fails to login more than 3 times
-        $loginFailsCacheKey = sha1('login_fails_'.Utils::getClientIp());
+        $loginFailsCacheKey = sha1('login_fails_'.get_client_ip());
         $loginFails = (int) Cache::get($loginFailsCacheKey, 0);
 
         if ($loginFails > 3) {
@@ -135,54 +134,52 @@ class AuthController extends Controller
 
         // If amount of registered accounts of IP is more than allowed amounts,
         // then reject the register.
-        if (User::where('ip', Utils::getClientIp())->count() < option('regs_per_ip'))
-        {
-            // Register a new user.
-            // If the email is already registered,
-            // it will return a false value.
-            $user = User::register(
-                $request->get('email'),
-                $request->get('password'), function($user) use ($request)
-            {
-                $user->ip           = Utils::getClientIp();
-                $user->score        = option('user_initial_score');
-                $user->register_at  = Utils::getTimeFormatted();
-                $user->last_sign_at = Utils::getTimeFormatted(time() - 86400);
-                $user->permission   = User::NORMAL;
-                $user->nickname     = $request->get(
-                    option('register_with_player_name') ? 'player_name' : 'nickname'
-                );
-            });
-
-            if (! $user) {
-                return json(trans('auth.register.registered'), 5);
-            }
-
-            event(new Events\UserRegistered($user));
-
-            // Add player with chosen name
-            if (option('register_with_player_name')) {
-                $player = new Player;
-                $player->uid           = $user->uid;
-                $player->player_name   = $request->get('player_name');
-                $player->preference    = 'default';
-                $player->last_modified = Utils::getTimeFormatted();
-                $player->save();
-
-                event(new Events\PlayerWasAdded($player));
-            }
-
-            return json([
-                'errno'    => 0,
-                'msg'      => trans('auth.register.success'),
-                'token'    => $user->getToken(),
-            ]) // Set cookies
-            ->withCookie('uid', $user->uid, 60)
-            ->withCookie('token', $user->getToken(), 60);
-
-        } else {
+        if (User::where('ip', get_client_ip())->count() >= option('regs_per_ip')) {
             return json(trans('auth.register.max', ['regs' => option('regs_per_ip')]), 7);
         }
+
+        // Register a new user.
+        // If the email is already registered,
+        // it will return a false value.
+        $user = User::register(
+            $request->get('email'),
+            $request->get('password'), function($user) use ($request)
+        {
+            $user->ip           = get_client_ip();
+            $user->score        = option('user_initial_score');
+            $user->register_at  = get_datetime_string();
+            $user->last_sign_at = get_datetime_string(time() - 86400);
+            $user->permission   = User::NORMAL;
+            $user->nickname     = $request->get(
+                option('register_with_player_name') ? 'player_name' : 'nickname'
+            );
+        });
+
+        if (! $user) {
+            return json(trans('auth.register.registered'), 5);
+        }
+
+        event(new Events\UserRegistered($user));
+
+        // Add player with chosen name
+        if (option('register_with_player_name')) {
+            $player = new Player;
+            $player->uid           = $user->uid;
+            $player->player_name   = $request->get('player_name');
+            $player->preference    = 'default';
+            $player->last_modified = get_datetime_string();
+            $player->save();
+
+            event(new Events\PlayerWasAdded($player));
+        }
+
+        return json([
+            'errno'    => 0,
+            'msg'      => trans('auth.register.success'),
+            'token'    => $user->getToken(),
+        ]) // Set cookies
+        ->withCookie('uid', $user->uid, 60)
+        ->withCookie('token', $user->getToken(), 60);
     }
 
     public function forgot()
@@ -204,7 +201,7 @@ class AuthController extends Controller
         }
 
         $rateLimit = 180;
-        $lastMailCacheKey = sha1('last_mail_'.Utils::getClientIp());
+        $lastMailCacheKey = sha1('last_mail_'.get_client_ip());
         $remain = $rateLimit + Cache::get($lastMailCacheKey, 0) - time();
 
         // Rate limit
diff --git a/app/Http/Controllers/PlayerController.php b/app/Http/Controllers/PlayerController.php
index ea1236fe..c7b78e58 100644
--- a/app/Http/Controllers/PlayerController.php
+++ b/app/Http/Controllers/PlayerController.php
@@ -4,7 +4,6 @@ namespace App\Http\Controllers;
 
 use View;
 use Event;
-use Utils;
 use Option;
 use App\Models\User;
 use App\Models\Player;
@@ -79,7 +78,7 @@ class PlayerController extends Controller
         $player->uid           = $this->user->uid;
         $player->player_name   = $request->input('player_name');
         $player->preference    = "default";
-        $player->last_modified = Utils::getTimeFormatted();
+        $player->last_modified = get_datetime_string();
         $player->save();
 
         event(new PlayerWasAdded($player));
diff --git a/app/Http/Controllers/SetupController.php b/app/Http/Controllers/SetupController.php
index 89933823..7bc94e49 100644
--- a/app/Http/Controllers/SetupController.php
+++ b/app/Http/Controllers/SetupController.php
@@ -4,7 +4,6 @@ namespace App\Http\Controllers;
 
 use Log;
 use File;
-use Utils;
 use Schema;
 use Option;
 use Storage;
@@ -101,10 +100,10 @@ class SetupController extends Controller
             $request->input('email'),
             $request->input('password'), function ($user)
         {
-            $user->ip           = Utils::getClientIp();
+            $user->ip           = get_client_ip();
             $user->score        = option('user_initial_score');
-            $user->register_at  = Utils::getTimeFormatted();
-            $user->last_sign_at = Utils::getTimeFormatted(time() - 86400);
+            $user->register_at  = get_datetime_string();
+            $user->last_sign_at = get_datetime_string(time() - 86400);
             $user->permission   = User::SUPER_ADMIN;
         });
         Log::info("[SetupWizard] Super Admin registered.", ['user' => $user]);
diff --git a/app/Http/Controllers/SkinlibController.php b/app/Http/Controllers/SkinlibController.php
index f029a3f9..5e4aa914 100644
--- a/app/Http/Controllers/SkinlibController.php
+++ b/app/Http/Controllers/SkinlibController.php
@@ -3,7 +3,6 @@
 namespace App\Http\Controllers;
 
 use View;
-use Utils;
 use Option;
 use Storage;
 use Session;
@@ -20,6 +19,23 @@ class SkinlibController extends Controller
 {
     protected $user = null;
 
+    /**
+     * Map error code of file uploading to human-readable text.
+     *
+     * @see http://php.net/manual/en/features.file-upload.errors.php
+     * @var array
+     */
+    public static $phpFileUploadErrors = [
+        0 => 'There is no error, the file uploaded with success',
+        1 => 'The uploaded file exceeds the upload_max_filesize directive in php.ini',
+        2 => 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form',
+        3 => 'The uploaded file was only partially uploaded',
+        4 => 'No file was uploaded',
+        6 => 'Missing a temporary folder',
+        7 => 'Failed to write file to disk.',
+        8 => 'A PHP extension stopped the file upload.',
+    ];
+
     public function __construct(UserRepository $users)
     {
         // Try to load user by uid stored in session.
@@ -167,7 +183,7 @@ class SkinlibController extends Controller
         $t->size      = ceil($request->file('file')->getSize() / 1024);
         $t->public    = ($request->input('public') == 'true') ? "1" : "0";
         $t->uploader  = $this->user->uid;
-        $t->upload_at = Utils::getTimeFormatted();
+        $t->upload_at = get_datetime_string();
 
         $cost = $t->size * (($t->public == "1") ? Option::get('score_per_storage') : Option::get('private_score_per_storage'));
         $cost += option('score_per_closet_item');
@@ -334,7 +350,7 @@ class SkinlibController extends Controller
     {
         if ($file = $request->files->get('file')) {
             if ($file->getError() !== UPLOAD_ERR_OK) {
-                return json(Utils::convertUploadFileError($file->getError()), $file->getError());
+                return json(static::$phpFileUploadErrors[$file->getError()], $file->getError());
             }
         }
 
diff --git a/app/Http/Controllers/UserController.php b/app/Http/Controllers/UserController.php
index e5573f03..cb8a2cd6 100644
--- a/app/Http/Controllers/UserController.php
+++ b/app/Http/Controllers/UserController.php
@@ -5,7 +5,6 @@ namespace App\Http\Controllers;
 use App;
 use Mail;
 use View;
-use Utils;
 use Session;
 use App\Models\User;
 use App\Models\Texture;
diff --git a/app/Models/Player.php b/app/Models/Player.php
index b39d0df2..09d4ceb3 100644
--- a/app/Models/Player.php
+++ b/app/Models/Player.php
@@ -3,7 +3,6 @@
 namespace App\Models;
 
 use Event;
-use Utils;
 use Response;
 use App\Models\User;
 use App\Events\GetPlayerJson;
@@ -98,7 +97,7 @@ class Player extends Model
             }
         }
 
-        $this->last_modified = Utils::getTimeFormatted();
+        $this->last_modified = get_datetime_string();
 
         $this->save();
 
@@ -159,7 +158,7 @@ class Player extends Model
     {
         $this->update([
             'preference'    => $type,
-            'last_modified' => Utils::getTimeFormatted()
+            'last_modified' => get_datetime_string()
         ]);
 
         event(new PlayerProfileUpdated($this));
@@ -187,7 +186,7 @@ class Player extends Model
     {
         $this->update([
             'player_name'   => $newName,
-            'last_modified' => Utils::getTimeFormatted()
+            'last_modified' => get_datetime_string()
         ]);
 
         $this->player_name = $newName;
@@ -272,7 +271,7 @@ class Player extends Model
     public function updateLastModified()
     {
         // @see http://stackoverflow.com/questions/2215354/php-date-format-when-inserting-into-datetime-in-mysql
-        $this->update(['last_modified' => Utils::getTimeFormatted()]);
+        $this->update(['last_modified' => get_datetime_string()]);
         return event(new PlayerProfileUpdated($this));
     }
 }
diff --git a/app/Models/User.php b/app/Models/User.php
index 6289d8d0..7170a452 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -3,7 +3,6 @@
 namespace App\Models;
 
 use DB;
-use Utils;
 use Carbon\Carbon;
 use App\Events\EncryptUserPassword;
 use Illuminate\Database\Eloquent\Model;
@@ -301,7 +300,7 @@ class User extends Model
             $acquiredScore = rand($scoreLimits[0], $scoreLimits[1]);
 
             $this->setScore($acquiredScore, 'plus');
-            $this->last_sign_at = Utils::getTimeFormatted();
+            $this->last_sign_at = get_datetime_string();
             $this->save();
 
             return $acquiredScore;
diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index e8df2704..b0ab2178 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -4,7 +4,6 @@ namespace App\Providers;
 
 use View;
 use Event;
-use Utils;
 use Parsedown;
 use App\Events;
 use ReflectionException;
@@ -62,7 +61,7 @@ class AppServiceProvider extends ServiceProvider
             }
         }
 
-        if (option('force_ssl') || Utils::isRequestSecure()) {
+        if (option('force_ssl') || is_request_secure()) {
             $this->app['url']->forceSchema('https');
         }
     }
diff --git a/app/Services/Utils.php b/app/Services/Utils.php
index d3f728f9..ed14f4ab 100644
--- a/app/Services/Utils.php
+++ b/app/Services/Utils.php
@@ -3,10 +3,6 @@
 namespace App\Services;
 
 use Log;
-use Storage;
-use Carbon\Carbon;
-use Illuminate\Support\Str;
-use App\Exceptions\PrettyPageException;
 
 class Utils
 {
@@ -16,21 +12,12 @@ class Utils
      * This method is defined because Symfony's Request::getClientIp() needs "setTrustedProxies()"
      * which sucks when load balancer is enabled.
      *
+     * @deprecated Use the helper function instead.
      * @return string
      */
     public static function getClientIp()
     {
-        if (option('ip_get_method') == "0") {
-            // Fallback to REMOTE_ADDR
-            $ip = array_get(
-                $_SERVER, 'HTTP_X_FORWARDED_FOR',
-                array_get($_SERVER, 'HTTP_CLIENT_IP', $_SERVER['REMOTE_ADDR'])
-            );
-        } else {
-            $ip = array_get($_SERVER, 'REMOTE_ADDR');
-        }
-
-        return $ip;
+        return get_client_ip();
     }
 
     /**
@@ -40,20 +27,12 @@ class Utils
      * This method is defined because Symfony's Request::isSecure() needs "setTrustedProxies()"
      * which sucks when load balancer is enabled.
      *
+     * @deprecated Use the helper function instead.
      * @return bool
      */
     public static function isRequestSecure()
     {
-        if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on')
-            return true;
-
-        if (! empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')
-            return true;
-
-        if (! empty($_SERVER['HTTP_X_FORWARDED_SSL']) && $_SERVER['HTTP_X_FORWARDED_SSL'] == 'on')
-            return true;
-
-        return false;
+        return is_request_secure();
     }
 
     public static function download($url, $path)
@@ -119,46 +98,29 @@ class Utils
         return strlen(stream_get_contents($fp));
     }
 
+    /**
+     * Get date time string in "Y-m-d H:i:s" format.
+     *
+     * @deprecated Use the helper function instead.
+     * @param integer $timestamp
+     * @return string
+     */
     public static function getTimeFormatted($timestamp = 0)
     {
-        return ($timestamp == 0) ? Carbon::now()->toDateTimeString() : Carbon::createFromTimestamp($timestamp)->toDateTimeString();
+        return get_datetime_string($timestamp);
     }
 
     /**
      * Replace content of string according to given rules.
      *
+     * @deprecated Use the helper function instead.
      * @param  string $str
      * @param  array  $rules
      * @return string
      */
     public static function getStringReplaced($str, $rules)
     {
-        foreach ($rules as $search => $replace) {
-            $str = str_replace($search, $replace, $str);
-        }
-        return $str;
-    }
-
-    /**
-     * Convert error number of uploading files to human-readable text.
-     *
-     * @param  int  $errno
-     * @return string
-     */
-    public static function convertUploadFileError($errno = 0)
-    {
-        $phpFileUploadErrors = [
-            0 => 'There is no error, the file uploaded with success',
-            1 => 'The uploaded file exceeds the upload_max_filesize directive in php.ini',
-            2 => 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form',
-            3 => 'The uploaded file was only partially uploaded',
-            4 => 'No file was uploaded',
-            6 => 'Missing a temporary folder',
-            7 => 'Failed to write file to disk.',
-            8 => 'A PHP extension stopped the file upload.',
-        ];
-
-        return $phpFileUploadErrors[$errno];
+        return get_string_replaced($str, $rules);
     }
 
 }
diff --git a/app/helpers.php b/app/helpers.php
index 729b3ec0..8d0649ac 100644
--- a/app/helpers.php
+++ b/app/helpers.php
@@ -258,7 +258,7 @@ if (! function_exists('bs_custom_copyright')) {
 
     function bs_custom_copyright()
     {
-        return Utils::getStringReplaced(option_localized('copyright_text'), [
+        return get_string_replaced(option_localized('copyright_text'), [
             '{site_name}' => option_localized('site_name'),
             '{site_url}' => option('site_url')
         ]);
@@ -546,3 +546,88 @@ if (! function_exists('format_http_date')) {
         return Carbon::createFromTimestampUTC($timestamp)->format('D, d M Y H:i:s \G\M\T');
     }
 }
+
+if (! function_exists('get_datetime_string')) {
+    /**
+     * Get date time string in "Y-m-d H:i:s" format.
+     *
+     * @param integer $timestamp
+     * @return string
+     */
+    function get_datetime_string($timestamp = 0) {
+        return $timestamp == 0 ? Carbon::now()->toDateTimeString() : Carbon::createFromTimestamp($timestamp)->toDateTimeString();
+    }
+}
+
+if (! function_exists('get_client_ip')) {
+    /**
+     * Return the client IP address.
+     *
+     * We define this function because Symfony's "Request::getClientIp()" method
+     * needs "setTrustedProxies()", which sucks when load balancer is enabled.
+     *
+     * @return string
+     */
+    function get_client_ip() {
+        if (option('ip_get_method') == "0") {
+            // Use `HTTP_X_FORWARDED_FOR` if available first
+            $ip = array_get(
+                $_SERVER,
+                'HTTP_X_FORWARDED_FOR',
+                // Fallback to `HTTP_CLIENT_IP`
+                array_get(
+                    $_SERVER,
+                    'HTTP_CLIENT_IP',
+                    // Fallback to `REMOTE_ADDR`
+                    array_get($_SERVER, 'REMOTE_ADDR')
+                )
+            );
+        } else {
+            $ip = array_get($_SERVER, 'REMOTE_ADDR');
+        }
+
+        return $ip;
+    }
+}
+
+if (! function_exists('get_string_replaced')) {
+    /**
+     * Replace content of string according to given rules.
+     *
+     * @param  string $str
+     * @param  array  $rules
+     * @return string
+     */
+    function get_string_replaced($str, $rules)
+    {
+        foreach ($rules as $search => $replace) {
+            $str = str_replace($search, $replace, $str);
+        }
+        return $str;
+    }
+}
+
+if (! function_exists('is_request_secure')) {
+    /**
+     * Check whether the request is secure or not.
+     * True is always returned when "X-Forwarded-Proto" header is set.
+     *
+     * We define this function because Symfony's "Request::isSecure()" method
+     * needs "setTrustedProxies()" which sucks when load balancer is enabled.
+     *
+     * @return bool
+     */
+    function is_request_secure()
+    {
+        if (array_get($_SERVER, 'HTTPS') == 'on')
+            return true;
+
+        if (array_get($_SERVER, 'HTTP_X_FORWARDED_PROTO') == 'https')
+            return true;
+
+        if (array_get($_SERVER, 'HTTP_X_FORWARDED_SSL') == 'on')
+            return true;
+
+        return false;
+    }
+}
diff --git a/resources/views/admin/update.tpl b/resources/views/admin/update.tpl
index 718a84c1..2cd46a0e 100644
--- a/resources/views/admin/update.tpl
+++ b/resources/views/admin/update.tpl
@@ -41,7 +41,7 @@
                                 <tr>
                                     <td class="key">{{ trans('admin.update.info.release-time') }}</td>
                                     <td class="value">
-                                        {{ Utils::getTimeFormatted($info['release_time']) }}
+                                        {{ get_datetime_string($info['release_time']) }}
                                     </td>
                                 </tr>
                                 <tr>
@@ -77,7 +77,7 @@
                                     <td class="key">{{ trans('admin.update.info.release-time') }}</td>
                                     <td class="value">
                                         @if ($info['release_time'])
-                                        {{ Utils::getTimeFormatted($info['release_time']) }}
+                                        {{ get_datetime_string($info['release_time']) }}
                                         @else
                                         {{ trans('admin.update.info.pre-release') }}
                                         @endif
diff --git a/resources/views/auth/forgot.tpl b/resources/views/auth/forgot.tpl
index a0c5583d..414f321e 100644
--- a/resources/views/auth/forgot.tpl
+++ b/resources/views/auth/forgot.tpl
@@ -42,7 +42,7 @@
                     <a href="{{ url('auth/login') }}" class="text-center">{{ trans('auth.forgot.login-link') }}</a>
                 </div>
                 <!-- /.col -->
-                <?php $remain = 180 + Cache::get(sha1('last_mail_'.Utils::getClientIp()), 0) - time(); ?>
+                <?php $remain = 180 + Cache::get(sha1('last_mail_'.get_client_ip()), 0) - time(); ?>
                 <div class="col-xs-4">
                     <button id="forgot-button" class="btn btn-primary btn-block btn-flat" data-remain="{{ $remain }}">
                         {{ trans('auth.forgot.button') }}
diff --git a/resources/views/auth/login.tpl b/resources/views/auth/login.tpl
index 28b5bb49..c3544f78 100644
--- a/resources/views/auth/login.tpl
+++ b/resources/views/auth/login.tpl
@@ -26,7 +26,7 @@
                 <span class="glyphicon glyphicon-lock form-control-feedback"></span>
             </div>
 
-            <div class="row" id="captcha-form" style="{{ (Cache::get(sha1('login_fails_'.Utils::getClientIp())) > 3) ? '' : 'display: none;' }}">
+            <div class="row" id="captcha-form" style="{{ (Cache::get(sha1('login_fails_'.get_client_ip())) > 3) ? '' : 'display: none;' }}">
                 <div class="col-xs-8">
                     <div class="form-group has-feedback">
                         <input id="captcha" type="text" class="form-control" placeholder="{{ trans('auth.captcha') }}">
diff --git a/resources/views/skinlib/show.tpl b/resources/views/skinlib/show.tpl
index 04c9f640..c22270f5 100644
--- a/resources/views/skinlib/show.tpl
+++ b/resources/views/skinlib/show.tpl
@@ -120,7 +120,7 @@
                         <div class="box-body">
                             @if (option('comment_script') != "")
                             <!-- Comment Start -->
-                            {!! Utils::getStringReplaced(option('comment_script'), ['{tid}' => $texture->tid, '{name}' => $texture->name, '{url}' => get_current_url()]) !!}
+                            {!! get_string_replaced(option('comment_script'), ['{tid}' => $texture->tid, '{name}' => $texture->name, '{url}' => get_current_url()]) !!}
                             <!-- Comment End -->
                             @else
                             <p style="text-align: center; margin: 30px 0;">{{ trans('skinlib.show.comment-not-available') }}</p>
diff --git a/tests/AuthControllerTest.php b/tests/AuthControllerTest.php
index 35798e61..01c978af 100644
--- a/tests/AuthControllerTest.php
+++ b/tests/AuthControllerTest.php
@@ -76,7 +76,7 @@ class AuthControllerTest extends TestCase
 
         $this->flushSession();
 
-        $loginFailsCacheKey = sha1('login_fails_'.Utils::getClientIp());
+        $loginFailsCacheKey = sha1('login_fails_'.get_client_ip());
 
         // Logging in should be failed if password is wrong
         $this->post(
@@ -477,7 +477,7 @@ class AuthControllerTest extends TestCase
         ]);
         config(['mail.driver' => 'smtp']);
 
-        $lastMailCacheKey = sha1('last_mail_'.Utils::getClientIp());
+        $lastMailCacheKey = sha1('last_mail_'.get_client_ip());
 
         // Should be forbidden if sending email frequently
         $this->withCache([
diff --git a/tests/ModelsTest/UserTest.php b/tests/ModelsTest/UserTest.php
index 7175b1bd..3e2e6c29 100644
--- a/tests/ModelsTest/UserTest.php
+++ b/tests/ModelsTest/UserTest.php
@@ -1,7 +1,6 @@
 <?php
 
 use App\Models\User;
-use App\Services\Utils;
 use Illuminate\Foundation\Testing\WithoutMiddleware;
 use Illuminate\Foundation\Testing\DatabaseMigrations;
 use Illuminate\Foundation\Testing\DatabaseTransactions;
@@ -13,7 +12,7 @@ class UserTest extends TestCase
     public function testSign()
     {
         $user = factory(User::class)->make([
-            'last_sign_at' => Utils::getTimeFormatted(time())
+            'last_sign_at' => get_datetime_string(time())
         ]);
         $user->sign();
         $this->assertFalse($user->sign());
diff --git a/tests/SkinlibControllerTest.php b/tests/SkinlibControllerTest.php
index 0b36857f..1f80e0f0 100644
--- a/tests/SkinlibControllerTest.php
+++ b/tests/SkinlibControllerTest.php
@@ -4,7 +4,6 @@ use App\Models\User;
 use App\Models\Closet;
 use App\Models\Player;
 use App\Models\Texture;
-use App\Services\Utils;
 use org\bovigo\vfs\vfsStream;
 use Illuminate\Http\UploadedFile;
 use Illuminate\Foundation\Testing\WithoutMiddleware;
@@ -418,7 +417,7 @@ class SkinlibControllerTest extends TestCase
             ->getContent();
         $this->seeJson([
             'errno' => UPLOAD_ERR_NO_TMP_DIR,
-            'msg' => Utils::convertUploadFileError(UPLOAD_ERR_NO_TMP_DIR)
+            'msg' => App\Http\Controllers\SkinlibController::$phpFileUploadErrors[UPLOAD_ERR_NO_TMP_DIR]
         ]);
 
         // Without `name` field