Add unit tests for checking - 'how to convert number of string to hex format'
Add unit tests for checking - 'how to convert number of string to hex format'

zigbee-alliance/distributed-compliance-ledger,zigbee-alliance/distributed-compliance-ledger,zigbee-alliance/distributed-compliance-ledger,zigbee-alliance/distributed-compliance-ledger,zigbee-alliance/distributed-compliance-ledger,zigbee-alliance/distributed-compliance-ledger