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from io import StringIO
from unittest import mock
class AssertFormatterFailureCaughtContext:
def __init__(self, test, shutil_which_result="nonexistent"):
self.stdout = StringIO()
self.stderr = StringIO()
self.test = test
self.shutil_which_result = shutil_which_result
def __enter__(self):
self.mocker = mock.patch(
"django.core.management.utils.shutil.which",
return_value=self.shutil_which_result,
)
self.mocker.start()
return self
def __exit__(self, exc_type, exc_value, traceback):
self.mocker.stop()
self.test.assertIn("Formatters failed to launch", self.stderr.getvalue())
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