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"""Unit tests for the FileChecker class."""
from __future__ import annotations
import argparse
import importlib.metadata
from unittest import mock
import pytest
import flake8
from flake8 import checker
from flake8.plugins import finder
@mock.patch("flake8.checker.FileChecker._make_processor", return_value=None)
def test_repr(*args):
"""Verify we generate a correct repr."""
file_checker = checker.FileChecker(
filename="example.py",
plugins=finder.Checkers([], [], []),
options=argparse.Namespace(),
)
assert repr(file_checker) == "FileChecker for example.py"
def test_nonexistent_file():
"""Verify that checking non-existent file results in an error."""
c = checker.FileChecker(
filename="example.py",
plugins=finder.Checkers([], [], []),
options=argparse.Namespace(),
)
assert c.processor is None
assert not c.should_process
assert len(c.results) == 1
error = c.results[0]
assert error[0] == "E902"
def test_raises_exception_on_failed_plugin(tmp_path, default_options):
"""Checks that a failing plugin results in PluginExecutionFailed."""
fname = tmp_path.joinpath("t.py")
fname.touch()
plugin = finder.LoadedPlugin(
finder.Plugin(
"plugin-name",
"1.2.3",
importlib.metadata.EntryPoint("X", "dne:dne", "flake8.extension"),
),
mock.Mock(side_effect=ValueError),
{},
)
fchecker = checker.FileChecker(
filename=str(fname),
plugins=finder.Checkers([], [], []),
options=default_options,
)
with pytest.raises(flake8.exceptions.PluginExecutionFailed) as excinfo:
fchecker.run_check(plugin)
expected = (
f'{fname}: "plugin-name[X]" failed during execution '
f"due to ValueError()"
)
assert str(excinfo.value) == expected
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