fix tests

app/Models/GradingLock.php

@@ -2,8 +2,6 @@
 
 namespace App\Models;
 
-use App\Models\BaseModel;
-
 class GradingLock extends BaseModel
 {
     protected $table = 'grading_locks';
@@ -24,9 +22,9 @@ class GradingLock extends BaseModel
 
     protected $casts = [
         'class_section_id' => 'integer',
-        'is_locked'        => 'boolean',
-        'locked_by'        => 'integer',
-        'locked_at'        => 'datetime',
+        'is_locked' => 'boolean',
+        'locked_by' => 'integer',
+        'locked_at' => 'datetime',
     ];
 
     /* Optional relationships */
@@ -63,6 +61,7 @@ class GradingLock extends BaseModel
     public static function isLocked(int $classSectionId, string $semester, string $schoolYear): bool
     {
         $row = static::getLock($classSectionId, $semester, $schoolYear);
+
         return (bool) ($row?->is_locked ?? false);
     }
-}
+}