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tests: Ensure hostcfgd tests do not access /proc/cmdline #292

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tests: Ensure hostcfgd tests do not access /proc/cmdline #292

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15 changes: 15 additions & 0 deletions tests/hostcfgd/conftest.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,3 +5,18 @@
@pytest.fixture(autouse=True, scope='session')
def mock_get_device_runtime_metadata():
device_info.get_device_runtime_metadata = mock.MagicMock(return_value={})

@pytest.fixture(autouse=True, scope='session')
def mock_open_proc_cmdline():
"""Automatically mock opening /proc/cmdline for all tests."""
EMPTY_LINE = "\n"
original_open = open

def mock_open_side_effect(filename, *args, **kwargs):
if filename == "/proc/cmdline":
return mock.mock_open(read_data=EMPTY_LINE)()
else:
return original_open(filename, *args, **kwargs)

with mock.patch("builtins.open", side_effect=mock_open_side_effect):
yield
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