def _register_proc(self, proc):
    self._active_processes.add(proc)
STDERR filter output: black foreground
dataset/ETHPy150Open ucb-sts/sts/sts/entities/controllers.py/Controller._register_proc--crossover with--dataset/ETHPy150Open gabrielfalcao/couleur/test_stderr_filter.py/test_output_black_foreground