What are decorators in Python and how do I test them?

What are decorators in Python and how do I test them?

Decorators are functions that modify the behavior of another function. To test them, you can use unittest or pytest.

Can you give me an example of a simple decorator?

Sure! Here's a simple decorator that logs the execution time of a function:

import time

def timer(func):
    def wrapper(*args, **kwargs):
        start_time = time.time()
        result = func(*args, **kwargs)
        end_time = time.time()
        print(f"{func.__name__} executed in {end_time - start_time} seconds")
        return result
    return wrapper

How would I test this timer decorator?

You can test it by creating a sample function and using a testing framework like pytest to assert the expected output.

What if I want to test multiple decorators on a single function?

You can stack decorators by applying them one after the other. Just ensure your tests account for the combined behavior.