What types of tests can you create to ensure the quality of your code?

To ensure code quality in Python, you can create several types of tests:

• Unit tests — check individual functions or methods for correctness in isolation. Usually written using unittest or pytest.

• Integration tests — verify the interaction of multiple components or modules together.

• Functional tests — test the application's functionality from the user's perspective, for example through HTTP requests to an API.

• Regression tests — ensure that new changes do not break existing functionality.

• Performance tests — measure speed and load.

A simple example of a unit test using pytest:

# my_module.py

def add(a, b):
    return a + b

# test_my_module.py
import pytest
from my_module import add

def test_add():
    assert add(2, 3) == 5
    assert add(-1, 1) == 0

This approach helps quickly identify errors and maintain code quality.