The document discusses the history and principles of test-driven development (TDD). Some key points include:
- TDD has its roots in the 1960s when programmers began testing their code. It grew out of the ideas of separation of concerns and automated testing.
- In the late 1980s and 1990s, many works helped establish TDD as a formal practice, including Kent Beck's work and the use of TDD in the C3 project.
- Core principles of TDD include writing tests before code, focusing on intent, listening to what tests reveal, and maintaining a safety culture with tests and continuous integration.