Test-driven development ( TDD) 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. This is as opposed to software being developed first and test cases created later.

TDD meaning: It is a process of modifying the code in order to pass a test designed previously. It more emphasis on production code rather than test case design. Test-driven development is a process of modifying the code in order to pass a test designed previously. In Software Engineering, It is sometimes known as “Test First Development.”