[FIX] coupon: fix undeterministic error in test

The previous code generation for coupon used `getrandbits` which
provides a less randomised code than uuid4 causing undeterministic
errors during the tests.

TaskId-2786904

closes odoo/odoo#87299

X-original-commit: 7c2d68b466e13a25a6dd7091383b1f9810f1a630
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>
Signed-off-by: William Braeckman (wbr) <wbr@odoo.com>

addons/coupon/models/coupon.py

@@ -5,6 +5,7 @@ from dateutil.relativedelta import relativedelta
 
 from odoo import api, fields, models, _
 
+from uuid import uuid4
 
 class Coupon(models.Model):
     _name = 'coupon.coupon'
@@ -22,7 +23,7 @@ class Coupon(models.Model):
         Generate 8 bytes (64 bits) barcodes as 16 bytes barcodes are not
         compatible with all scanners.
          """
-        return str(random.getrandbits(64))
+        return str(uuid4())[:22]
 
     code = fields.Char(default=lambda self: self._generate_code(), required=True, readonly=True)
     expiration_date = fields.Date('Expiration Date', compute='_compute_expiration_date')