Test-driven development (TDD) is the process of creating software with minimal bugs. At the end of each testing phase, the testing team hopes to have produced code that is completely bug-free. Code testing is something that could assist you in achieving your product quality goals. Providing a number of alternates, testing finds and fixes every bug and helps reduce the overall cost of the code. As a goal, testers should create code that requires less upkeep. However, the most difficult part of checking is finding good examples to verify the code. The testing industry has come a long way. However, before the code is handed over to the customer, it must undergo extensive testing. This document does a great job of describing the many types of testing, outlining its goals, and describing the various stages of the code checking life cycle, as well as the test cases and phases that comprise it.