fix test issues

app/Models/AssignmentModel.php

@@ -1,53 +0,0 @@
-<?php
-
-namespace App\Models;
-
-use CodeIgniter\Model;
-
-class AssignmentModel extends Model
-{
-    protected $table            = 'assignments';
-    protected $primaryKey       = 'id';
-    protected $useAutoIncrement = true;
-    protected $returnType       = 'array';
-    protected $useSoftDeletes   = false;
-    protected $protectFields    = true;
-    protected $allowedFields    = [
-        'title',
-        'description',
-        'due_date',
-        'class_id',
-        'teacher_id',
-        'student_id',
-        'created_at',
-        'updated_at',
-    ];
-
-    protected bool $allowEmptyInserts = false;
-    protected bool $updateOnlyChanged = true;
-
-    protected $useTimestamps = true;
-    protected $dateFormat    = 'datetime';
-    protected $createdField  = 'created_at';
-    protected $updatedField  = 'updated_at';
-    protected $deletedField  = 'deleted_at';
-
-    protected $validationRules = [
-        'title'      => 'required|string|max_length[255]',
-        'due_date'   => 'required|valid_date',
-        'class_id'   => 'required|integer',
-        'teacher_id' => 'required|integer',
-    ];
-    protected $validationMessages   = [];
-    protected $skipValidation       = false;
-    protected $cleanValidationRules = true;
-    protected $allowCallbacks = true;
-    protected $beforeInsert   = [];
-    protected $afterInsert    = [];
-    protected $beforeUpdate   = [];
-    protected $afterUpdate    = [];
-    protected $beforeFind     = [];
-    protected $afterFind      = [];
-    protected $beforeDelete   = [];
-    protected $afterDelete    = [];
-}