Why is Test Driven Development the Need of the Hour?

TDD – test driven development: A method in which developers write automated tests before they finally put up the actual code. It is an increasingly common procedure used to boost quality of programmes and lower bugs. The importance of reliable code has become more crucial as software grows in complexity and criticality to our everyday lifestyles. This is where TDD comes in to ensure that designers think of how to make their program testable. This blog post will discuss why test driven development is a crucial approach in modern software engineering.

What is test-driven development?

Test-driven development (TDD) is a software development process that relies on the repetition of a very short development cycle: first the developer writes an (initially failing) automated test case that defines a desired improvement or new function, then produces the minimum amount of code to pass that test, and finally refactors the new code to acceptable standards.

The Value of Automated Testing

TDD is founded on the principle of automated testing. Automated testing helps assures developers that new code would neither introduce bugs nor break down the already-functioning application. Instead, it enables the refactoring of code so as to avoid regressions resulting from any modification. Automatic tests can also be applied to document how the code should be used. Test suite gives new developer, joining a project, insight into the purpose and limitations related to coding. In particular, the automatic tests uncover the errors swiftly. 

Design for Testability

As such, TDD requires software engineers to consider testability even as they write tests prior to actual code. For instance, testing of a tightly coupled code or one that depends on external data bases, web services cannot be done in isolation. The loose coupling and tight cohesion by virtue of interfaces, dependency injection and mocks/stubs for external resources is promoted in TDD. It ensures that code is modular and self-contained. 

Early Error Detection

The most important advantage of TDD is that it finds defects at the earliest stage of development. It is more useful for software developers to locate defects early enough through using automated tests that report on errors on-the-spot. Fixing bugs that arise during development is often simpler than locating and fixing similar bugs when a software program is already in production. Tests are written, with TDD, prior to the existence of any implementation code. 

Continuous Improvement

While meeting initial system requirements, the red-green-refactor stage of the TDD process ensures that a developer maintains a high level of coding standards and enhances already existing software quality. Automated tests are sort of check-points which ensure that simplification of designs, improved speed as well as adding of new features do not affect the way in which software operate under normal conditions. 

Collaboration and Knowledge Sharing

Such executable documentation is also known as an automated test that can be disseminated throughout the teams. Good tests describe using examples or edge cases how written code should operate. Additionally, codebases developed via this approach are easier for junior developers who join a project. Tests do not require extensive documentations since they represent good practice.


The increasing complexity of software systems make testing throughout the entire development life cycle inevitable. One way to overcome this hurdle is through test driven development, which involves embedding automated testing and quality in the centre of software engineering. Now you know what is test driven development, it develops robust, modular and scalable code that can be easily updated or refactored as requirements change over time.

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