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import copy
import sys
from django.core.management.validation import get_validation_errors
from django.db.models.loading import cache, load_app
from django.test.utils import override_settings
from django.utils import unittest
from django.utils.six import StringIO
class InvalidModelTestCase(unittest.TestCase):
"""Import an appliation with invalid models and test the exceptions."""
def setUp(self):
# Make sure sys.stdout is not a tty so that we get errors without
# coloring attached (makes matching the results easier). We restore
# sys.stderr afterwards.
self.old_stdout = sys.stdout
self.stdout = StringIO()
sys.stdout = self.stdout
# This test adds dummy applications to the app cache. These
# need to be removed in order to prevent bad interactions
# with the flush operation in other tests.
self.old_app_models = copy.deepcopy(cache.app_models)
self.old_app_store = copy.deepcopy(cache.app_store)
def tearDown(self):
cache.app_models = self.old_app_models
cache.app_store = self.old_app_store
cache._get_models_cache = {}
sys.stdout = self.old_stdout
# Technically, this isn't an override -- TEST_SWAPPED_MODEL must be
# set to *something* in order for the test to work. However, it's
# easier to set this up as an override than to require every developer
# to specify a value in their test settings.
@override_settings(
TEST_SWAPPED_MODEL='invalid_models.ReplacementModel',
TEST_SWAPPED_MODEL_BAD_VALUE='not-a-model',
TEST_SWAPPED_MODEL_BAD_MODEL='not_an_app.Target',
)
def test_invalid_models(self):
try:
module = load_app("modeltests.invalid_models.invalid_models")
except Exception:
self.fail('Unable to load invalid model module')
get_validation_errors(self.stdout, module)
self.stdout.seek(0)
error_log = self.stdout.read()
actual = error_log.split('\n')
expected = module.model_errors.split('\n')
unexpected = [err for err in actual if err not in expected]
missing = [err for err in expected if err not in actual]
self.assertFalse(unexpected, "Unexpected Errors: " + '\n'.join(unexpected))
self.assertFalse(missing, "Missing Errors: " + '\n'.join(missing))
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