Test Driven Development; An Introduction

Test Driven Development, is also known as Test-first development is a type of software development where the test code will be written before the production code. There are two different goals for this type of development. At first, it will help the developers to think about the requirements and design even before the starting of the development and secondly, it will help the developers to write clean codes. Both these advantages play an important role in increasing the popularity and acceptance of the test driven development.

Test driven development cycle consists of five stages.

Add Test

Every new feature in a test driven development starts with a writing of a test. In this stage, the developer should be well aware of the exact requirement and accordingly the code will be written to define the function or to improve the function. Here the developer has all the rights to use a framework of his or her choice.

Run all the Tests and Check whether the New Test Run

In this stage, the developer will ensure that all tests other than the new test pass, as the code for the new test is not yet written.

Write code

The code will be written in this stage so that the new test can be passed.

Run Tests

At this stage, all the tests will be run and if everything passes, the software under development is proved to have met all requirements.

Refract Code

In this stage, all the duplicate codes will be removed and the code will be replaced from the position where it is suited for passing the test to the place where they logically belong.

At present, test driven development is gaining popularity and wide acceptance and is being preferred over the traditional method of development as it has many advantages.

  • The major advantage of test driven development is that the development cost can be reduced considerably as the test and development are done simultaneously. This will help reduce the price of the final product and help to get an edge over the competitors.
  • Similarly, the project can be completed earlier and the delivery can be made thus reducing the turnaround time. This is also a plus point in a competitive market.
  • Productivity can be enhanced.
  • Codes will work better as they will be more organized and neat.

Test driven development is gaining wider acceptance over the traditional method of software development with its many advantages.

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