# Copyright 2021 The Layout Parser team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import pytest

from layoutparser import requires_backends

def test_when_backends_are_not_loaded():

    # When all the backeds are not installed, it should 
    # elicit only ImportErrors

    for backend_name in ["torch", "detectron2", "paddle", "effdet", "pytesseract", "google-cloud-vision"]:
        with pytest.raises(ImportError):
            requires_backends("a", backend_name)