Mock Python's built in print function

Question

I\'ve tried

from mock import Mock
import __builtin__

__builtin__.print = Mock()

But that raises a syntax error. I\'ve also tried patching

Answer 1

This is a much simpler Python 3 solution -- it's easier to use unittest.mock directly on the builtin print function, rather than fiddling around with sys.stdout:

from unittest.mock import patch, call

@patch('builtins.print')
def test_print(mocked_print):
    print('foo')
    print()

    assert mocked_print.mock_calls == [call('foo'), call()]