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from unittest import mock
import pytest
@pytest.yield_fixture(autouse=True)
def disable_subp_usage(request):
"""
Across all (pytest) tests, ensure that util.subp is not invoked.
Note that this can only catch invocations where the util module is imported
and ``util.subp(...)`` is called. ``from cloudinit.util import subp``
imports happen before the patching here (or the CiTestCase monkey-patching)
happens, so are left untouched.
To allow a particular test method or class to use util.subp you can set the
parameter passed to this fixture to False using pytest.mark.parametrize::
@pytest.mark.parametrize("disable_subp_usage", [False], indirect=True)
def test_whoami(self):
util.subp(["whoami"])
This fixture (roughly) mirrors the functionality of
CiTestCase.allowed_subp. N.B. While autouse fixtures do affect non-pytest
tests, CiTestCase's allowed_subp does take precedence (and we have
TestDisableSubpUsageInTestSubclass to confirm that).
TODO:
* Enable select subp usage (i.e. allowed_subp=[...])
"""
should_disable = getattr(request, "param", True)
if should_disable:
with mock.patch('cloudinit.util.subp', autospec=True) as m_subp:
m_subp.side_effect = AssertionError("Unexpectedly used util.subp")
yield
else:
yield
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