"""
Test Slinky
"""
import random
from typing import Any
from unittest import TestCase, mock

from slinky import Slinky, random_string


class TestSlinky(TestCase):
    """
    Class to test Slinky code
    """

    test_db = 'sqlite:///tests/test.db'

    def test_random_string(self) -> None:
        """
        Ensure the random string generates correctly
        """

        rnd_len = random.randint(8, 128)

        self.assertEqual(4, len(random_string()))
        self.assertEqual(rnd_len, len(random_string(rnd_len)))

        self.assertTrue(random_string(128).isalnum(), True)

    @mock.patch('sqlalchemy.orm.session.Session.add', return_value=None)
    @mock.patch('slinky.random_string', return_value='abcd')
    def test_add(self, *_: Any) -> None:
        """
        Ensure we can add a shortcode to the DB
        """
        self.assertEqual(
            Slinky(self.test_db).add('https://www.example.com'),
            'abcd',
        )

    def test_get(self) -> None:
        """
        Ensure we can fetch a URL for a known shortcode
        """

        self.assertEqual('https://example.com', Slinky(self.test_db).get('egie').url)

    @mock.patch('sqlalchemy.orm.session.Session.add', return_value=None)
    @mock.patch('slinky.random_string', return_value='egie')
    def test_duplicate_shortcode(self, *_: Any) -> None:
        """
        Ensure duplicate shortcodes raise a ValueError exception
        """
        self.assertRaises(
            ValueError,
            Slinky(self.test_db).add,
            'https://www.example.com',
        )