End-to-End Sandbox
End-to-End Sandbox Test Data Approach & Plan
The MHHS Programme published the End-to-End (E2E) Sandbox Test Data Approach & Plan for industry consultation.
This consultation closed on 6 June 2025. Thank you to everyone who responded.
The End-to-End Sandbox Test Data Approach & Plan document defined a test data approach and provided a view of specific data requirements to support Sandbox Testing using the User Integration Testing (UIT) environment.
Sandbox testing in the UIT environment was provided on the basis of being supported by the same Test Harnesses used for Non-Systems Integration Testing (Non-SIT) Qualification Testing, it therefore relied heavily on the Qualification Test Data Approach and Plan documents for both Non-SIT Licensed Distribution System Operators (LDSOs) and Non-SIT Supplier & Agents, as the process used for E2E Sandbox in the UIT environment and Qualification Testing was essentially the same.
This document was a child document of the E2E Sandbox Guidance document which established a clear scope for Sandbox Testing. So, this document should have been read in conjunction with the E2E Sandbox Guidance document, which is available further down this page.
All comments were triaged and the document was presented for discussion at the Qualification Working Group (QWG) on Tuesday 10 June 2025. On Thursday 19 June 2025, the Qualification Advisory Group (QAG) formally approved the document, which you can view below:
End-to-end Sandbox Test Data Approach & Plan
If you have any questions about this consultation, please email [email protected]
End-to-End Sandbox Guidance
The End-to-End (E2E) Sandbox Guidance document set out the scope for the Sandbox and outlined the key principles supporting the creation, set up and operation of the Sandbox test environment for optional use by Programme participants.
The Code Bodies updated this document to version 2.4 with principles previously socialised via the Qualification Test Execution Forum (QTEF). Changes made to the document were minor and included:
- Figure 2 timeline updated in Section 5
- Inclusion of Section 9.3.1 “Entry Criteria for Supplier and Agent Sandbox Testing”
- Additional bullet within Section 9.11 “Defect Management” confirming Qualification Testing (QT) defect resolution priority vs. Sandbox defects
You can view clean and red-lined versions of this document via the links below:
End-to-End Sandbox Guidance v2.4 (Clean)
End-to-End Sandbox Guidance v2.4 (Red-lined)
The Qualification and End-to-End (E2E) Sandbox Working Group (QWG) endorsed this update and the Qualification Advisory Group (QAG) approved it in December 2025.
If you have any questions about this document, please email [email protected]
Non-SIT Supplier & Agent Sandbox Testing Proforma
Non-SIT Suppliers and Agents interested in using the Qualification Testing Framework (QTF)-supported Sandbox environment needed to complete the Sandbox Testing Proforma, available below:
Non-SIT Supplier & Agent Qualification Sandbox Testing Proforma
The proforma should have been completed in its entirety and submitted to the Qualification Testing team at [email protected] at least one month before completing Qualification Testing (QT).
The Sandbox provided a flexible opportunity for Non-SIT Suppliers and Agents who wished to complete supplementary testing in the QTF after the QT phase.
If you have any questions about the proforma or Non-SIT Supplier and Agent Sandbox Testing more broadly, please email [email protected]
