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NOAA Environmental Modeling System Regression Test Suite, system evaluation and requirements for a new system
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    The NOAA Environmental Modeling System (NEMS) is a collection of numerical models of various aspects of the environment, coupled together via the NUOPC coupler. This creates a complex combination of source codes wherein a change to one model could break other models in unpredictable ways. For this reason, the NEMS Regression Tests (RT) were created. They compile the NEMS in various ways, and test the models in pre-specified scenarios. This suite is automated so that a user can type a simple command to run a suite of over forty such tests. When a user makes some change to one model, the user may run the test suite to see if there were any unintended effects. The present suite works well for a limited set of cases, but is having trouble adapting to new models, coupled modeling, new platforms and other issues. For this reason, we are designing a new regression test suite with increased adaptability and additional capabilities. This document describes the old system, analyzes its strengths and weaknesses, and describes requirements for a new system. [doi:10.7289/V5/ON-NCEP-484 (]
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