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When an NTP source is specified with the offset option, the corrected offset may get outside of the supported NTP interval (by default -50..86 years around the build date). If the source passed the source selection, the offset would be rejected only later in the adjustment of the local clock. Check the offset validity as part of the NTP test A to make the source unselectable and make it visible in the measurements log and ntpdata report.
This is a collection of simulation tests using the clknetsim simulator (supported on Linux only). https://github.com/mlichvar/clknetsim The CLKNETSIM_PATH environment variable should point to the directory where clknetsim was downloaded and compiled. If the variable is not set, the tests will look for clknetsim in ./clknetsim in the current directory. The tests are written in bash and they can be run directly. The ./run script runs all tests.