This testmod directory currently isn't used in any tests, but is useful for the following reason: According to Mariana Vertenstein: At least at one point, you could get bit-for-bit answers when comparing the mct and nuopc versions of CTSM in an I compset with SROF and SGLC, if using the changes in this testmod in both the mct and nuopc runs. So we are keeping this around in case someone wants to reproduce that comparison.