what I currently have is:
def some_method():
some_obj = some_other_method()
# This is what I want to mock return value of:
some_obj.some_obj_some_method()
@patch('some_package.some_other_method')
def test_some_stuff(some_other_method_patch):
some_other_method_patch.return_value = SomeObject()
How could I get about setting some_obj.some_obj_some_method() return value to False?
patch('some_package.some_other_method') will replace the function some_other_method with a Mock. Now you need to replace the return value of the method some_obj_some_method of this mock:
mock.return_value.some_obj_some_method.return_value = False
The complete example:
# some_package.py
class SomeObject:
def some_obj_some_method(self):
raise RuntimeError()
def some_other_method():
return SomeObject()
def some_method():
some_obj = some_other_method()
# This is what you want to mock return value of:
return some_obj.some_obj_some_method()
Test:
from unittest.mock import patch
from some_package import SomeObject, some_method
@patch('some_package.some_other_method')
def test_some_stuff(function_mock):
function_mock.return_value.some_obj_some_method.return_value = False
assert not some_method()
The test will pass as is, will raise a RuntimeError without patching and fail the assertion without the line function_mock.return_value.some_obj_some_method.return_value = False because some_method will only return a Mock that is never False.
You can use patch.object
import mock
import some_obj
@mock.patch.object(some_obj, "some_obj_some_method")
def test_some_stuff(mock_some_obj_some_method):
mock_some_obj_some_method.return_value = False
