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