Create record by XML for test with readonly transaction

issue10936

trytond/tests/field_function.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+this repository contains the full copyright notices and license terms. -->
+<tryton>
+    <data>
+        <record model="test.function.getter_context" id="field_function_getter_context">
+        </record>
+    </data>
+</tryton>

trytond/tests/test_field_function.py

@@ -52,8 +52,7 @@ class FieldFunctionTestCase(unittest.TestCase):
 
         with Transaction().new_transaction(readonly=True), \
                 patch.object(Model, 'getter') as getter:
-            record = Model()
-            record.save()
+            record, = Model.search([], limit=1)
             record.function_with_context
             record.function_without_context
             self.assertEqual(getter.call_count, 2)

trytond/tests/tryton.cfg

@@ -8,4 +8,5 @@ xml:
     workflow.xml
     wizard.xml
     modelview.xml
+    field_function.xml
     message.xml