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harness.py

import ast
import textwrap
import unittest

from pyflakes import checker

__all__ = ['TestCase', 'skip', 'skipIf']

skip = unittest.skip
skipIf = unittest.skipIf

class TestCase(unittest.TestCase):

withDoctest = False

def flakes(self, input, *expectedOutputs, **kw):
        tree = ast.parse(textwrap.dedent(input))
        file_tokens = checker.make_tokens(textwrap.dedent(input))
        if kw.get('is_segment'):
            tree = tree.body[0]
            kw.pop('is_segment')
        w = checker.Checker(
            tree, file_tokens=file_tokens, withDoctest=self.withDoctest, **kw
        )
        outputs = [type(o) for o in w.messages]
        expectedOutputs = list(expectedOutputs)
        outputs.sort(key=lambda t: t.__name__)
        expectedOutputs.sort(key=lambda t: t.__name__)
        self.assertEqual(outputs, expectedOutputs, '''\
for input:
{}
expected outputs:
{!r}
but got:
{}'''.format(input, expectedOutputs, '\n'.join([str(o) for o in w.messages])))
        return w

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