Cleaned some unused elements during testing

app/Auth/Access/Mfa/BackupCodeService.php

@@ -34,20 +34,14 @@ class BackupCodeService
 
     /**
      * Remove the given input code from the given available options.
-     * Will return null if no codes remain otherwise will be a JSON string to contain
-     * the codes.
+     * Will return a JSON string containing the codes.
      */
-    public function removeInputCodeFromSet(string $code, string $codeSet): ?string
+    public function removeInputCodeFromSet(string $code, string $codeSet): string
     {
         $cleanCode = $this->cleanInputCode($code);
         $codes = json_decode($codeSet);
         $pos = array_search($cleanCode, $codes, true);
         array_splice($codes, $pos, 1);
-
-        if (count($codes) === 0) {
-            return null;
-        }
-
         return json_encode($codes);
     }
 

app/Auth/Access/Mfa/MfaValue.php

@@ -58,17 +58,6 @@ class MfaValue extends Model
         return $mfaVal ? $mfaVal->getValue() : null;
     }
 
-    /**
-     * Delete any stored MFA values for the given user and method.
-     */
-    public static function deleteValuesForUser(User $user, string $method): void
-    {
-        static::query()
-            ->where('user_id', '=', $user->id)
-            ->where('method', '=', $method)
-            ->delete();
-    }
-
     /**
      * Decrypt the value attribute upon access.
      */