What types of testing and scenarios do you implement in your practice?

In Python testing practice, I usually implement several types of tests:

• Unit testing — testing individual functions or classes. I use unittest or pytest.
• Integration testing — testing the interaction of multiple components.
• Functional testing — testing business logic and user scenarios.
• API testing — using libraries like requests and pytest.
• Performance testing — using profiling tools.

Scenarios depend on the project but typically include:

• Testing with correct and incorrect input data.
• Testing boundary conditions.
• Testing exception handling.

Here's an example of a simple unit test with pytest:

import pytest

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


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

This approach helps ensure code quality and facilitates maintenance.