What approaches and standards do you use when creating test scenarios for Python code?

When creating test scenarios for Python, I adhere to the following approaches and standards:

• Use frameworks like unittest or pytest for organizing tests.
• Write tests that cover both positive and negative scenarios.
• Follow the "Arrange-Act-Assert" principle for clarity.
• Use fixtures to prepare test data and environment.
• Write independent tests so they can be run in any order.
• Use mock objects to isolate tested components.
• Strive for good code coverage without compromising test quality.
• Follow PEP 8 for readability of test code.

Example of a simple test with pytest:

import pytest

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


def test_add_positive():
    assert add(2, 3) == 5


def test_add_negative():
    assert add(-1, -1) == -2

This approach helps create maintainable and reliable tests.