Master Test-Driven Development: Boost Quality, Speed, and Reliability

Sandeep Chaudhari

The Agile methodology has changed the software development landscape, allowing teams to speed up the delivery of high-quality solutions. A test-driven approach brings along with its better testing and robust quality assurance measures during each release.

Test-driven development is a process in which you write the test before you write the code. When all the tests are passed, you clean your kitchen and improve the code. Yet, Test-Driven Development is not about testing. The premise behind test-driven development is that all code should be tested and refactored continually. It depends on the repetition of a very short development cycle.

Test-driven development is a technique in which automated Unit tests are used to drive the design and free decoupling of dependencies.

The following sequence of steps is generally followed:

  1. Write a test case that completely describes the function. The developer must understand the features and requirements and create the test cases using user stories and use cases.
  2. Run all the test cases and ensure the new test case fails.
  3. Write the code that passes the test case.
  4. Run the test cases.
  5. Refactor code – This is done to remove duplication of code.
  6. Repeat the steps mentioned above again and again.

  • Red – Create a test case and make it fail.
  • Green – Make the test case pass by any means.
  • Refactor – Change the code to remove duplicate/redundancy.


There are two main approaches to TDD — Inside Out and Outside In.

Inside Out

With the Inside Out approach, the focus is on the results (or state). Testing begins at the smallest unit level, and the architecture emerges organically. This approach is generally easier for beginners, attempts to minimize mocking, and helps prevent over-engineering. Design happens at the refactor stage, which can, unfortunately, result in large refactoring.

Outside In

The Outside In approach focuses on user behavior. Testing begins at the outer-most level, and the details emerge as you progress. This approach relies heavily on mocking and stubbing external dependencies. It’s generally harder to learn, but it helps ensure the code aligns with the overall business needs. Design happens at the red stage.


TDD is a prudent way of providing high-quality releases and provides crucial benefits.

  • Continuous Feedback: The unit test provides constant feedback about the functions.
  • Enhanced Quality: Quality of design increases, which further helps in proper maintenance.
  • Better Security: Test-driven development acts as a safety net against the bugs.
  • Aligns with the Requirements: TDD ensures your application meets its requirements.
  • Short SDLC: TDD has a very short development lifecycle.


TDD comes along with a couple of drawbacks:

  • Long Development Process: The main drawback of TDD is the speed with which the development progresses in the initial stage of the project. But it takes speed and speed in the later phases.
  • Steep learning curve: It takes time and has a steep learning curve.

Test-driven development (TDD) is akin to a journey of evolution against adversity. The product’s quality reaches new heights by testing and developing code simultaneously. It represents the latest and most precise approach, where requirements seamlessly converge with implementation, delivering the end-user the experience they deserve.

Ready to embark on the journey of Test-Driven Development with V2Solutions? Implement TDD practices today to elevate your software development process and deliver high-quality solutions efficiently. Witness the transformative power it brings to your development lifecycle. Click here to learn more about our Quality Engineering services.

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