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92 lines
3.2 KiB
Python
92 lines
3.2 KiB
Python
"""Tests for the Manager object for FileCheckers."""
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from __future__ import annotations
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import errno
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import multiprocessing
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from unittest import mock
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import pytest
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from flake8 import checker
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from flake8.main.options import JobsArgument
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from flake8.plugins import finder
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def style_guide_mock():
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"""Create a mock StyleGuide object."""
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return mock.MagicMock(
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**{
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"options.diff": False,
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"options.jobs": JobsArgument("4"),
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}
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)
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def _parallel_checker_manager():
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"""Call Manager.run() and return the number of calls to `run_serial`."""
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style_guide = style_guide_mock()
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manager = checker.Manager(style_guide, finder.Checkers([], [], []))
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# multiple checkers is needed for parallel mode
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manager.checkers = [mock.Mock(), mock.Mock()]
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return manager
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def test_oserrors_cause_serial_fall_back():
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"""Verify that OSErrors will cause the Manager to fallback to serial."""
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err = OSError(errno.ENOSPC, "Ominous message about spaceeeeee")
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with mock.patch("_multiprocessing.SemLock", side_effect=err):
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manager = _parallel_checker_manager()
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with mock.patch.object(manager, "run_serial") as serial:
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manager.run()
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assert serial.call_count == 1
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@mock.patch.object(multiprocessing, "get_start_method", return_value="fork")
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def test_oserrors_are_reraised(_):
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"""Verify that unexpected OSErrors will cause the Manager to reraise."""
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err = OSError(errno.EAGAIN, "Ominous message")
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with mock.patch("_multiprocessing.SemLock", side_effect=err):
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manager = _parallel_checker_manager()
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with mock.patch.object(manager, "run_serial") as serial:
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with pytest.raises(OSError):
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manager.run()
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assert serial.call_count == 0
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@mock.patch.object(multiprocessing, "get_start_method", return_value="spawn")
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def test_multiprocessing_is_disabled(_):
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"""Verify not being able to import multiprocessing forces jobs to 0."""
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style_guide = style_guide_mock()
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manager = checker.Manager(style_guide, finder.Checkers([], [], []))
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assert manager.jobs == 0
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def test_multiprocessing_cpu_count_not_implemented():
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"""Verify that jobs is 0 if cpu_count is unavailable."""
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style_guide = style_guide_mock()
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style_guide.options.jobs = JobsArgument("auto")
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with mock.patch.object(
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multiprocessing,
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"cpu_count",
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side_effect=NotImplementedError,
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):
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manager = checker.Manager(style_guide, finder.Checkers([], [], []))
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assert manager.jobs == 0
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@mock.patch.object(multiprocessing, "get_start_method", return_value="spawn")
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def test_make_checkers(_):
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"""Verify that we create a list of FileChecker instances."""
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style_guide = style_guide_mock()
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style_guide.options.filenames = ["file1", "file2"]
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manager = checker.Manager(style_guide, finder.Checkers([], [], []))
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with mock.patch("flake8.utils.fnmatch", return_value=True):
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with mock.patch("flake8.processor.FileProcessor"):
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manager.make_checkers(["file1", "file2"])
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assert manager._all_checkers
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for file_checker in manager._all_checkers:
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assert file_checker.filename in style_guide.options.filenames
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assert not manager.checkers # the files don't exist
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