`--testing` flag does not prevent overwriting of result files
gridpath_run has the --testing flag which should suppress saving of results https://github.com/blue-marble/gridpath/blob/8a8042b667ff19aea3f283bd41f56e484af5ce92/gridpath/common_functions.py#L173-L174
However, scenario results are saved and the test results for verification are overwritten. run_scenario.py does not seem to have any branching logic for this flag.
Yep, this should have been removed from the help menu as it's not hooked up anywhere at this point. I see there are still some references to "testing mode" in run_scenario.py, which should also be clarified.
I feel this is still useful functionality to have, FWIW. Currently the example test values to be compared and checked are within the test script itself, maybe it can read from the result files?