I've been working a lot recently wrapping some 3rd party code in classes and scripts that make them compatible with our existing systems. Part of the testing for this has involved a lot of mocking. We are currently testing with pytest and using mocker to mock the 3rd party libraries. I've been really impressed at how easy the mocking framework is to use.
This post has a fantastic summary of the different mock cases.
However, a couple of things have caught me out on patching imports. If the class under test uses:
import library
then you can use:
mocked_list_feature_classes = mocker.patch(
'library.ListFeatureClasses')
However, if the import is:
from library import ListFeatureClasses
then the patching needs to be on the class under test:
mocked_list_feature_classes = mocker.patch(
'the_package_under_test.class_under_test.ListFeatureClasses')
