def _assert_valid_thumbnail_filename(
self,
expected_error_substring: str,
thumbnail_filename: str
) -> None:
"""Helper method for test_require_valid_thumbnail_filename."""
with self.assertRaisesRegex( # type: ignore[no-untyped-call]
utils.ValidationError, expected_error_substring):
utils.require_valid_thumbnail_filename(
thumbnail_filename)
def test_require_valid_thumbnail_filename(self) -> None:
"""Test thumbnail filename validation."""
self._assert_valid_thumbnail_filename(
'Expected thumbnail filename to be a string, received 10', 10) # type: ignore[arg-type]
self._assert_valid_thumbnail_filename(
'Thumbnail filename should not start with a dot.', '.name')
self._assert_valid_thumbnail_filename(
'Thumbnail filename should not include slashes or '
'consecutive dot characters.', 'file/name')
self._assert_valid_thumbnail_filename(
'Thumbnail filename should not include slashes or '
'consecutive dot characters.', 'file..name')
self._assert_valid_thumbnail_filename(
'Thumbnail filename should include an extension.', 'name')
self._assert_valid_thumbnail_filename(
'Expected a filename ending in svg, received name.jpg', 'name.jpg')
filename = 'filename.svg'
utils.require_valid_thumbnail_filename(filename)
