gistfile1.py

import unittest
import github

from mock import patch, Mock
from github import Github, GithubException

def is_valid_repo(user_name, repo_name):
    github_client = Github("TOKEN_HERE")
    try:
        api_user = github_client.get_user(user_name)
        api_repo = api_user.get_repo(repo_name)
        return True
    except GithubException:
        return False


@patch('github.Github')
class Test(unittest.TestCase):
    
    def test_is_valid_repo(self, Github):
        user_name = 'Ivaylo-Bachvarov'
        repo_name = 'Telerik-Courses'

        api_repo = Mock()
        api_repo.get_repo = Mock(side_effect=GithubException('status', 'data'))
        # I have no idea what is status and data. It just requres them.
        
        github_client = Mock()
        github_client.get_user = Mock(return_value=api_repo)

        Github.return_value = github_client
        self.assertEqual(is_valid_repo(user_name, repo_name), False)

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