testing `unittest`

test.py

def say_hi(name='World'):
    if name == None or name == '':
        name = "World"
    if type(name) != str:
        name = str(name)
    return f"Hello, {name}!"

unittest_test.py

import unittest
import test

class HelloTest(unittest.TestCase):

    def test_no_arg(self):
        self.assertEqual(test.say_hi(), "Hello, World!")

    def test_none(self):
        self.assertEqual(test.say_hi(None), "Hello, World!")

    def test_number(self):
        self.assertEqual(test.say_hi(413), "Hello, 413!")
    
    def test_bool(self):
        self.assertEqual(test.say_hi(True), "Hello, True!")

    def test_alice(self):
        self.assertEqual(test.say_hi("Alice"), "Hello, Alice!")

    def test_empty(self):
        self.assertEqual(test.say_hi(''), "Hello, World!")

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