The test script tries to write to the value attribute of a node with the DataType LocalizedText while specifying an unsupported locale (locale = '??').
According to specifications this behavior is server specific and the test script allows a wide of returned OperationResults: Good, Bad_InvalidArgument, Bad_WriteNotSupported, Bad_SyntaxError.

The test case only allows Bad_LocaleNotSupported.

Either the test case or the test script should be updated.

Since the specification explicitly states that 'The Write behaviour for Value Attributes with a LocalizedText DataType is Server specific [...]', the test script also may search for nodes with writable attributes other than Value (for example Description).