56. Testing for Security and Resilience

Use tests to simulate bad input, missing files, and malformed data.

Example

import pytest, json
from pydo import safe_save

def test_invalid_task(monkeypatch):
    with pytest.raises(ValueError):
        from pydo import sanitize_task_input
        sanitize_task_input("X" * 500)

def test_file_storage(tmp_path):
    file_path = tmp_path / "tasks.json"
    safe_save([{"task": "Secure Task"}])
    assert file_path.exists()

✅ Lesson: Test for security failures, not just functional correctness.

Example​

Example