def test_add(self): ^ IndentationError: expected an indented block after function definition on line 41

It seems like there is an indentation error in your code. The test_add function should have an indented block of code inside it. Here is an example of how the test_add function should be properly indented:

def test_add(self):
    result = add(3, 5)
    self.assertEqual(result, 8)

Make sure that the code inside the test_add function is indented properly so that it is considered part of the function.