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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
import contextlib
from typing import Dict, Optional, Type
from pylint.testutils.global_test_linter import linter
from pylint.testutils.unittest_linter import UnittestLinter
from pylint.utils import ASTWalker
class CheckerTestCase:
"""A base testcase class for unit testing individual checker classes."""
CHECKER_CLASS: Optional[Type] = None
CONFIG: Dict = {}
def setup_method(self):
self.linter = UnittestLinter()
self.checker = self.CHECKER_CLASS(self.linter) # pylint: disable=not-callable
for key, value in self.CONFIG.items():
setattr(self.checker.config, key, value)
self.checker.open()
@contextlib.contextmanager
def assertNoMessages(self):
"""Assert that no messages are added by the given method."""
with self.assertAddsMessages():
yield
@contextlib.contextmanager
def assertAddsMessages(self, *messages):
"""Assert that exactly the given method adds the given messages.
The list of messages must exactly match *all* the messages added by the
method. Additionally, we check to see whether the args in each message can
actually be substituted into the message string.
"""
yield
got = self.linter.release_messages()
no_msg = "No message."
expected = "\n".join(repr(m) for m in messages) or no_msg
got_str = "\n".join(repr(m) for m in got) or no_msg
msg = (
"Expected messages did not match actual.\n"
f"\nExpected:\n{expected}\n\nGot:\n{got_str}\n"
)
assert got == list(messages), msg
def walk(self, node):
"""recursive walk on the given node"""
walker = ASTWalker(linter)
walker.add_checker(self.checker)
walker.walk(node)
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