+- Local testers should use (and rebuild regularly) the appropriate sandbox to perform tests and/or contributions to test plans, so that potential issues can be reliably diagnosed and solved.
+- This means that all known changes in the installation procedures of any sandbox will be captured in the companion "provisioner" script (typically, `provisioner.sh`), so that the exact procedure can be well-known and testable by everyone.
+- In case something that was known to work in a sandbox started to fail:
+ - It should be reported as a bug if there were no further contributions to the sandbox, since it is likely to be a gap in the knowledge/testing of the corresponding provisioning procedure, that might have changed over time (e.g new dependencies, change of repositories, hardcoded locations, etc.)
+ - In case new contributions (e.g. new tests, new patches, etc.) were not functional in the corresponding sandbox, the contributor should review them locally first, since they are likely to have issues.