def test_exists_raises_error(self, mocker):
"""Check the error when `exists` raises an exception"""
mocked_exists = mocker.Mock()
error_message = "File not found"
mocked_exists.side_effect = FileNotFoundError(error_message)
data_set = LambdaDataSet(None, None, mocked_exists)
with pytest.raises(DataSetError, match=error_message):
data_set.exists()
mocked_exists.assert_called_once_with()
def test_exists_invocation(self, mocker):
"""Test the basic `exists` method invocation"""
mocked_exists = mocker.Mock(return_value=True)
data_set = LambdaDataSet(None, None, mocked_exists)
result = data_set.exists()
mocked_exists.assert_called_once_with()
assert result is True
def test_exists_not_implemented(self):
"""Check that `exists` method returns False by default"""
data_set = LambdaDataSet(None, None)
assert not data_set.exists()
