unit test for logging and traceback

tasks.py

import logging
import traceback

logger = logging.getLogger('django')

class PDFParserManager(object):

    def run(self):
        veiculo_list = list()
        for key, value in enumerate(self.pesquisas):
            try:
                veiculo_list.append(self.parse(value))
            except Exception, e:
                logger.error('module=plugins.prepara_leilao.tasks.'
                    'PDFParserManager exception="%s" key=%d value="%s"' % (e, key, value))
                logger.error(str(traceback.format_exc()))

        self.salva_veiculos(veiculo_list)

test_tasks.py

# test_tasks.py
from mock import patch, call
from unittest import TestCase

class PDFParserManagerTest(TestCase):

    def setUp(self):
        arquivo = codecs.open('plugins/prepara_leilao/tests/data/exemplo.pdf', 'r')
        self.manager = PDFParserManager(arquivo)

    @patch('plugins.prepara_leilao.tasks.traceback.format_exc')
    @patch('plugins.prepara_leilao.tasks.logger')
    @patch('plugins.prepara_leilao.tasks.PDFParserManager.parse')
    def test_run_log(self, _parse, _logger, _format_exc):
        _format_exc.return_value = 'foo'
        _parse.side_effect= Exception('BOOM!')

        self.manager.pesquisas = ['bar']
        self.manager.run()

        call_list = [
            call('module=plugins.prepara_leilao.tasks.PDFParserManager'
                ' exception="BOOM!" key=0 value="bar"'),
            call('foo'),
        ]

        _logger.error.assert_has_calls(call_list)