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from __future__ import unicode_literals
import logging
from django.template import Engine, Variable, VariableDoesNotExist
from django.test import SimpleTestCase
class TestHandler(logging.Handler):
def __init__(self):
super(TestHandler, self).__init__()
self.log_record = None
def emit(self, record):
self.log_record = record
class VariableResolveLoggingTests(SimpleTestCase):
def setUp(self):
self.test_handler = TestHandler()
self.logger = logging.getLogger('django.template')
self.original_level = self.logger.level
self.logger.addHandler(self.test_handler)
self.logger.setLevel(logging.DEBUG)
def tearDown(self):
self.logger.removeHandler(self.test_handler)
self.logger.level = self.original_level
def test_log_on_variable_does_not_exist_silent(self):
class TestObject(object):
class SilentDoesNotExist(Exception):
silent_variable_failure = True
@property
def template_name(self):
return "template"
@property
def template(self):
return Engine().from_string('')
@property
def article(self):
raise TestObject.SilentDoesNotExist("Attribute does not exist.")
def __iter__(self):
return iter(attr for attr in dir(TestObject) if attr[:2] != "__")
def __getitem__(self, item):
return self.__dict__[item]
Variable('article').resolve(TestObject())
self.assertEqual(
self.test_handler.log_record.msg,
'template - Attribute does not exist.'
)
def test_log_on_variable_does_not_exist_not_silent(self):
with self.assertRaises(VariableDoesNotExist):
Variable('article.author').resolve({'article': {'section': 'News'}})
self.assertEqual(
self.test_handler.log_record.msg,
'unknown - Failed lookup for key [author] in %r' %
("{%r: %r}" % ('section', 'News'), )
)
def test_no_log_when_variable_exists(self):
Variable('article.section').resolve({'article': {'section': 'News'}})
self.assertIsNone(self.test_handler.log_record)