#unit test
""" doc string"""
import unittest
from project2.addition import add

class AdditionTestCase(unittest.TestCase):
    """Tests for `addtion.py`"""

    def test_is_valid_input(self):
        """checking for input in codes"""
        self.assertTrue(add('4', '5'))
    def test_is_alphabet(self):
        """testing for alphabets"""
        self.assertFalse('A'.islower())
    def test_is_valid_input2(self):
        """testing for normal integers"""
        self.assertTrue(add(4, 5))
if __name__ == '__main__':
    unittest.main()

@@ -290,16 +290,17 @@
 alphabet
+l
 (self):%0A
@@ -488,16 +488,125 @@
 (4, 5))%0A
+    def test_is_alphabetu(self):%0A        %22%22%22testing for alphabets%22%22%22%0A        self.assertFalse('A'.isupper())%0A
 if __nam

Create test_addition.py