from subprocess import CalledProcessError
import unittest
import subprocess
import os


class ArgumentTestClass(unittest.TestCase):

  def setUp(self):
    import tempfile
    self.existing_dir = tempfile.mkdtemp()

  def test_argument_required(self):
    with self.assertRaises(CalledProcessError):
      subprocess.check_output(['python', 'manga_up'])

  def test_destination_exists(self):
    result = subprocess.check_output(['python', 'manga_up', '--destination', 'nonexistent'])
    self.assertIn('does not exist', str(result))

  def test_destination_is_not_directory(self):
    result = subprocess.check_output(['python', 'manga_up', '--destination', self.existing_file])
    self.assertIn('not a directory', str(result))

  def tearDown(self) -> None:
      os.rmdir(self.existing_dir)

if __name__ == '__main__':
  unittest.main()