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What is TDD – Process & Benefits

What’s TDD?

TDD, also known as Test-Driven Development (or TDD), focuses on the creation of test cases before actually writing the code. This allows code to be tested first and, if the test fails, a new version of the code will be written. This will ensure that the code is error-free from the beginning and therefore won’t break over time.

TDD is software development. The process begins with the design and development of tests to test every bit of functionality. It emphasizes production code over test case design.

TDD is a simple concept. This allows you to fix the existing code before writing the next code. The developer will then write the next set code once the code has been approved. Let’s now understand what TDD is.


TDD usually takes 3 steps

Creating test cases The developer creates unit tests cases to validate the code’s functionality. The majority of people will say that the test will fail. However, this is not true. Tests that may fail are often written by developers. This is because they need to be able to predict how their assumptions will play out before they go too far.

Rectifying Code: Developers need to make minimal changes to a failed test in order to have it pass again.

Refactoring – Once your code is running, you can check if there are any optimizations that could be made to improve the overall performance.


1. Quality of the Code

TDD allows for the development of clean, simple, and extensible code. TDD tests the functionality of an application in isolation, while BDD analyzes the behaviour. TDD is a part of every developer’s daily practice. It will help to establish good habits and lead to better code. Before implementing a feature, developers should first ask why it is necessary. This helps them become more aware of the system’s requirements. This method can prove to be very taxing for developers as it may lead to poorly defined requirements.

2. Qualitative Application

By creating breakpoint tests before the production code, developers can spend more time designing the boundary situations that will be covered by these tests than with the previous method. It results in better testing and fewer bugs/defects at the end of the development process.

3. Accuracy of tests increased:

TDD has higher coverage and test density by default. TDD requires that all functionality be associated with a set or automated unit tests. The code is therefore subject to more tests and has a wider coverage.

4. Increases productivity of developers

TDD speeds up development by decreasing the time spent debugging. TDD can increase time spent on developing production code and tests in the initial stages. As the project grows, it will be easier to implement and test new features, which will require less rework. It is much cheaper to fix the problem immediately than wait for months.

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Final Thoughts

A development technique called test-driven development requires that you create a test that fails before creating new functional code. Agile software developers adopt TDD to develop application source code, and Agile DBAs adopt TDD to develop database applications.

TDD can be seen as an extension to Agile Model-Driven Development, and both may or should be used together. TDD does not replace traditional testing. It is a way to ensure good unit testing. TDD also produces working examples that can be used to call the code. This results in a functional specification of the code.

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