def test_get_authors_list(self):
        """
        Must return authors list depending on different letters/letter case/words/symbols.
        """
        self.assertEqual(Author.get_authors_list('bEst'), ['Best Author 1'])
        self.assertEqual(Author.get_authors_list('1'), ['Best Author 1'])
        self.assertEqual(Author.get_authors_list(' '), ['Best Author 1', 'zlast author'])
        self.assertEqual(Author.get_authors_list('new'), ['trueAuthorNew'])
        self.assertEqual(Author.get_authors_list('TRUE'), ['trueAuthorNew'])
        self.assertEqual(Author.get_authors_list('Best Author 1'), ['Best Author 1'])
        self.assertEqual(Author.get_authors_list('trueAuthorNew'), ['trueAuthorNew'])