def test_future_map_raise_exception():
f = RPCFuture()
new = f.map(process_err)
f.set_result(40)
with pytest.raises(TExc):
assert new.result()
def test_future_on_chained_exception():
f = RPCFuture()
new = f.map(lambda v: v + 2)
f.set_exception(TExc())
with pytest.raises(TExc):
assert new.result()
def test_future_map_returns_new_future():
f = RPCFuture()
new = f.map(lambda v: v + 2)
f.set_result(40)
assert new.result() == 42