unit testing - How to return multiple values when using mock patch.object with contextlib.nested -

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i new unit testing , trying write unit test using patch.object mock function calls. mocked function getobj() called twice in function testing. first time when called expecting none return_value , second time expecting some_string. not getting how it.

the code follows:

def test_create(self):     contextlib.nested(         patch.object(agent, 'try_connect',         patch.object(util, 'get_obj', return_value = none),         ) (mock_try_connect, mock_get_obj):         proxy_info = self.util.create(data)

i tried using side_effects, , give input return_value every time returning none.

mock_value=mock() mock_value.side_effect = [none, 'some_string'] patch.object(util, 'get_obj', return_value = mock_value())

use assert_has_calls verify mocked out object being called how expect called. debug issue. 

def test_create(self):     contextlib.nested(             patch.object(agent, 'try_connect',             patch.object(util, 'get_obj', side_effect = [none, 'some_string']),             ) (mock_try_connect, mock_get_obj):         proxy_info = self.util.create(data)         mock_try_connect.assert_has_calls([mock.call(#params), ...])         mock_get_obj.assert_has_calls([...])

now once you've debugged issue can delete last 2 statements since add nothing test coverage , make code harder maintain.


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