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# This file is part of cloud-init. See LICENSE file for license information.
from unittest import mock
from cloudinit.config.cc_mounts import create_swapfile
M_PATH = 'cloudinit.config.cc_mounts.'
class TestCreateSwapfile:
@mock.patch(M_PATH + 'util.subp')
def test_happy_path(self, m_subp, tmpdir):
swap_file = tmpdir.join("swap-file")
fname = str(swap_file)
# Some of the calls to util.subp should create the swap file; this
# roughly approximates that
m_subp.side_effect = lambda *args, **kwargs: swap_file.write('')
create_swapfile(fname, '')
assert mock.call(['mkswap', fname]) in m_subp.call_args_list
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