Asserting input was not called

Question

I've come across a niche situation while writing unit tests in python. I want to assert that the user was not prompted for input. There are plenty of examples showing how to simulate input using unittest.mock, or how to tell if methods of a user-defined object were called. However, input is a python builtin method.

What would be the best way of doing this?

Please leave a comment when downvoting so that I can improve my questions in the future — RedPanda, Nov 11 '19 at 21:05

score 0 · Answer 1 · answered Nov 11 '19 at 21:05

By brute force testing, it looks like the following works:

def foo():
    return 7

with patch('builtins.input', return_value='y') as mocked:
    foo()

mocked.assert_not_called()

whereas the following will fail the test:

def foo():
    input('bar')
    return 7

with patch('builtins.input', return_value='y') as mocked:
    foo()

mocked.assert_not_called()

Asserting input was not called

1 Answers1