Since IEC 61850[1] became the widely used standard for substation communication with a lot of implementations testing is an important issue. The standard in its current version covers some possibilities and approaches for testing in general and for measurements of performance. They will be described and analysed. According to the approach of IEC 61850 the IEDs (Intelligent Electronic Devices) contain a data model to be used for different services. To cover testing issues the data model contains testing information, they will be described.