[matter_yamltests] Add is_nullable method to SpecDefinitions (#24624)

scripts/py_matter_yamltests/matter_yamltests/definitions.py

@@ -146,6 +146,11 @@ def is_fabric_scoped(self, target) -> bool:
  return bool(target.qualities & StructQuality.FABRIC_SCOPED)
  return False
 
+ def is_nullable(self, target) -> bool:
+ if hasattr(target, 'qualities'):
+ return bool(target.qualities & FieldQuality.NULLABLE)
+ return False
+
  def __get_by_name(self, cluster_name: str, target_name: str, target_type: _ItemType):
  if not cluster_name or not target_name:
  return None

scripts/py_matter_yamltests/test_spec_definitions.py

@@ -54,6 +54,21 @@
  </configurator>
 '''
 
+source_response_with_nullable = '''<?xml version="1.0"?>
+ <configurator>
+ <cluster>
+ <name>Test</name>
+ <code>0x1234</code>
+
+ <command source="server" code="0x0" name="TestCommandResponse">
+ <arg name="arg1" type="int8u"/>
+ <arg name="arg2" type="int8u" isNullable="true"/>
+ </command>
+
+ </cluster>
+ </configurator>
+'''
+
 source_attribute = '''<?xml version="1.0"?>
  <configurator>
  <global>
@@ -184,6 +199,24 @@ def test_response_name(self):
  self.assertEqual(definitions.get_response_name(
  0x1234, 0x0), 'TestCommandResponse')
 
+ def test_response_name_with_nullable(self):
+ definitions = SpecDefinitions(
+ [ParseSource(source=io.StringIO(source_response_with_nullable), name='source_response_with_nullable')])
+ cluster_name = 'Test'
+ response_name = 'TestCommandResponse'
+
+ self.assertEqual(definitions.get_cluster_name(0x1234), cluster_name)
+ self.assertEqual(definitions.get_response_name(
+ 0x1234, 0x0), response_name)
+
+ response = definitions.get_response_by_name(
+ cluster_name, response_name)
+ for field in response.fields:
+ if field.name == 'arg1':
+ self.assertFalse(definitions.is_nullable(field))
+ else:
+ self.assertTrue(definitions.is_nullable(field))
+
  def test_attribute_name(self):
  definitions = SpecDefinitions(
  [ParseSource(source=io.StringIO(source_attribute), name='source_attribute')])