1import unittest
 2from unittest.mock import mock_open, patch
 3from secret import validate_recipe, RuinedNikuldenDinnerError
 4
 5class TestNikuldenValidator(unittest.TestCase):
 6    """Test all requirements related to the function that identify specific keywords in recipe files."""
 7    def test_valid_recipe(self):
 8        """Test with valid recipes."""
 9        valid_recipe = "С шаран или рибена супа ще почерпи Ники? Той е ценител на лукса - Сьонга ще е."
10        with patch("builtins.open", mock_open(read_data=valid_recipe)):
11            self.assertTrue(validate_recipe("valid_file.txt"))
12
13    def test_invalid_recipe(self):
14        """Test with invalid recipes."""
15        invalid_recipe = "Мислех този Никулден да минем с цаца, но Ники иска сьомга."
16        with patch("builtins.open", mock_open(read_data=invalid_recipe)):
17            self.assertFalse(validate_recipe("invalid_file.txt"))
18
19    def test_bad_recipe_file(self):
20        """Test with problem with read from file (OSError or IOError)."""
21        with patch("builtins.open", side_effect=OSError):
22            with self.assertRaises(RuinedNikuldenDinnerError):
23                validate_recipe("dummy.txt")
24
25if __name__ == '__main__':
26    unittest.main()