[IMP] tests: evaluate domain strings in node modifiers in Form

This commit changes the node modifiers domain evaluation in the Form test class to allow strings.
Domains as strings are used by the web client to evaluate special values such as 'uid'.

Part-of: odoo/odoo#99735

odoo/tests/common.py

@@ -37,6 +37,7 @@ except ImportError:
     InvalidStateError = NotImplementedError
 from contextlib import contextmanager, ExitStack
 from datetime import datetime, date
+from dateutil.relativedelta import relativedelta
 from itertools import zip_longest as izip_longest
 from unittest.mock import patch
 from xmlrpc import client as xmlrpclib
@@ -2107,14 +2108,29 @@ class Form(object):
         contexts = fvg['contexts'] = {}
         order = fvg['fields_ordered'] = []
         field_level = fvg['tree'].xpath('count(ancestor::field)')
+        eval_context = {
+            "uid": self._env.user.id,
+            "tz": self._env.user.tz,
+            "lang": self._env.user.lang,
+            "datetime": datetime,
+            "context_today": lambda: odoo.fields.Date.context_today(self._env.user),
+            "relativedelta": relativedelta,
+            "current_date": time.strftime("%Y-%m-%d"),
+            "allowed_company_ids": [self._env.user.company_id.id],
+            "context": {},
+        }
         for f in fvg['tree'].xpath('.//field[count(ancestor::field) = %s]' % field_level):
             fname = f.get('name')
             order.append(fname)
 
-            node_modifiers = {
-                modifier: ([TRUE_LEAF] if domain else [FALSE_LEAF]) if isinstance(domain, int) else normalize_domain(domain)
-                for modifier, domain in json.loads(f.get('modifiers', '{}')).items()
-            }
+            node_modifiers = {}
+            for modifier, domain in json.loads(f.get('modifiers', '{}')).items():
+                if isinstance(domain, int):
+                    node_modifiers[modifier] = [TRUE_LEAF] if domain else [FALSE_LEAF]
+                elif isinstance(domain, str):
+                    node_modifiers[modifier] = normalize_domain(safe_eval(domain, eval_context))
+                else:
+                    node_modifiers[modifier] = normalize_domain(domain)
 
             for a in f.xpath('ancestor::*[@modifiers][count(ancestor::field) = %s]' % field_level):
                 ancestor_modifiers = json.loads(a.get('modifiers'))