# -*- coding: utf-8 -*-
# Copyright 2023 Google LLC
#
# 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.
"""Unittest for ArgumentParser."""
from __future__ import annotations

import argparse
from absl.testing import absltest
from google.generativeai.notebook import argument_parser as parser_lib


class ArgumentParserTest(absltest.TestCase):

  def test_help(self):
    """Verify that help messages raise ParserNormalExit."""
    parser = parser_lib.ArgumentParser()
    with self.assertRaisesRegex(
        parser_lib.ParserNormalExit, "show this help message and exit"
    ):
      parser.parse_args(["-h"])

  def test_parse_arg_errors(self):
    def new_parser() -> argparse.ArgumentParser:
      parser = parser_lib.ArgumentParser()
      parser.add_argument("--value", type=int, required=True)
      return parser

    # Normal case: no error.
    results = new_parser().parse_args(["--value", "42"])
    self.assertEqual(42, results.value)

    with self.assertRaisesRegex(parser_lib.ParserError, "invalid int value"):
      new_parser().parse_args(["--value", "forty-two"])

    with self.assertRaisesRegex(
        parser_lib.ParserError, "the following arguments are required"
    ):
      new_parser().parse_args([])

    with self.assertRaisesRegex(
        parser_lib.ParserError, "expected one argument"
    ):
      new_parser().parse_args(["--value"])


if __name__ == "__main__":
  absltest.main()