Here is a code snippet on how to test open built-in function: Code to test: def my_function(self, id: int) -> None: file_path = ‘path/to/files/{}.txt’.format(id) with open(file_path, ‘w’) as f: f.write(‘< My data…
So lets say we need to write unit test for piece of code that uses __import__ built-in function: def task_we_want_to_test(task_name: str, task_class: str, env: dict) -> Task: module = __import__(…
Before we start writing tests let’s make sure that we understand why do we want to write unit tests and the concept of unit testing. Here are a few reasons (from my…