Clean Code in Python

Evolving our code

In the previous example, we were able to separate out the side-effects from our code to make it testable by patching those parts of the code that depended on things we couldn't control on the unit test. This is a good approach since, after all, the mock.patch function comes in handy for these sorts of task and replaces the objects we tell it to, giving us back a Mock object.

The downside of that is that we have to provide the path of the object we are going to mock, including the module, as a string. This is a bit fragile, because if we refactor our code (let's say we rename the file or move it to some other location), all the places with the patch will have to be updated, or the test will break.

In the example, the fact ...