import os

from mpi4py import rc

assert rc.initialize is True
assert rc.finalize is None
assert rc.threads is True
assert rc.thread_level == "multiple"

os.environ["MPI4PY_RC_INITIALIZE"] = "false"
os.environ["MPI4PY_RC_FINALIZE"] = "true"
os.environ["MPI4PY_RC_THREADS"] = "false"
os.environ["MPI4PY_RC_THREAD_LEVEL"] = "single"

os.environ["MPI4PY_RC_IRECV_BUFSZ"] = str(2048)
os.environ["MPI4PY_PICKLE_PROTOCOL"] = str(3)
os.environ["MPI4PY_PICKLE_THRESHOLD"] = str(1024)

from mpi4py import MPI  # noqa: E402

assert not MPI.Is_initialized()
assert not MPI.Is_finalized()

assert rc.initialize is False
assert rc.finalize is True
assert rc.threads is False
assert rc.thread_level == "single"

assert rc.irecv_bufsz == 2048
assert MPI.pickle.PROTOCOL == 3
assert MPI.pickle.THRESHOLD == 1024