This document provides an overview of software testing and different types of software tests. It discusses why software testing is important to objectively assess if a system meets requirements. Unit testing, integration testing, and functional testing are described as the main types of software development tests. Unit tests check individual code components, integration tests check how components work together, and functional tests verify that features function as specified. Automated testing frameworks like pytest and assertions are recommended for writing unit tests to test functions in a concise and repeatable way. Functions should be designed to be testable by taking inputs as parameters and returning results without external dependencies.