Test Driven Development (TDD) refers a software development process involving the repetition of a very short development cycle. In the development cycle, the Cryptex ruby on Rails developers writes an automated test case (initially failing). In the automated test case, our developer defines a desired improvement. The developer defines a new function. In the agile test driven development process the developers’ produces the minimum amount of code in order to pass the test. Later, the written code is restructured to acceptable standards. The designer of such type of coding practice is of the opinion that it inspires confidence, encourages simple designs.

Until now, BDD has offered countless significant benefits to organizations, which are as follows:

• There are different aspects of using the test driven development style. For instance, it is better to keep units related to the TDD small, reduce debugging effort. Moreover, small test cases are simple to comprehend.
• The test driven development programming process when used with a version control system, is used to revert the code to the last version that successfully passed all the tests if the tests failed. This is a more productive programming approach than debugging.
• The TDD allows the programmer to focus on the task at hand, as the objective is to make the test a pass.

In the test driven development process related to software development process, the coding defects are limited by increasing the number of tests. Frequent testing helps to catch the defects in the development cycle preventing them to become expensive, endemic. Defect elimination in the TDD process helps to avoid tedious, lengthy debugging later. Therefore, TDD has wide applications in development process that make it popular among the users.