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Use clknetsim to run multiple chronyd instances with simulated clocks and network. It allows fast and reproducible testing, without real network. Included are several tests of performance in different clock/network conditions, chronyd options, NTP authentication, chronyc, and past bug fixes.
This is a collection of simulation tests. They use clknetsim to simulate multiple systems connected in a network. It's available at https://github.com/mlichvar/clknetsim If this directory doesn't have a clknetsim subdirectory, a known working revision will be downloaded and compiled automatically. Currently it runs only on Linux. The tests are written in bash and they can be run directly. The ./run script runs all tests.