sudoku_checker.py

def is_complete(numbers):
    if len(numbers) != 9:
        return False

test_sudoku_checker.py

import sudoku_checker
import unittest

class TestSudokuChecker(unittest.TestCase):
    def test_is_complete_empty(self):
        test_input = []
        expected = False
        actual = sudoku_checker.is_complete(test_input)
        self.assertEqual(expected, actual, "The row is empty.")

    def test_is_complete_too_short(self):
        test_input = [1, 2, 3, 4, 5, 6, 7, 8]
        expected = False
        actual = sudoku_checker.is_complete(test_input)
        self.assertEqual(expected, actual, "The row is too short.")

unittest.main()