Test-driven development is a software development process relying on software requirements being converted to test cases before software is fully developed, and tracking all software development by repeatedly testing the software against all test cases. Wikipedia

A type of software development methodology Wikipedia Disambiguation

Repetition of a very short development cycle: requirements are turned into very specific test cases, then the software is improved to pass the new tests, only Wikidata

A software development technique consisting of short iterations where new test cases covering the desired improvement or new functionality are written first, then the production code necessary to pass the tests is implemented, and finally the software is refactored to accommodate changes. OmegaWiki