Usually, the traditional method to developing code is to start with a design, implement that design, and then test the implementation to ensure that it runs as smoothly as intended. However, test-driven development (TDD) completely changes the software development process by emphasizing writing tests before code, turning tests into an iterative, ongoing practice.
Unlike the traditional waterfall model where testing is an end-of-cycle event, TDD integrates testing at every step. The TDD cycle consists of writing a failing test, implementing the feature to pass the test, and then refactoring the code. It’s deeply rooted in Agile principles, promoting iterative development, customer feedback, and adaptability.
Good adaptability comes from TDD’s ability to ensure that each development round begins with a clear, testable goal, which fosters collaboration and ensures that there is quality assurance in every phase. This is done by writing unit tests for core functionalities before implementing the feature. Once the feature is implemented, the code is refined to pass the test. Eventually, through iterative cycles, the entire application is built.
TDD offers numerous benefits for software delivery teams, including improved collaboration, robustness, and cost-effectiveness. Applications developed using TDD tend to be more robust due to the quick feedback loop, allowing bugs to be detected and resolved early on in the development cycle.
Moreover, by starting simple, organizing tests, regular refactoring, and building a comprehensive test suite, TDD leads to improved design and architecture, lowered long-term costs, increased confidence in code changes, and effective documentation.
Practicing the TDD method in class was an eye-opening experience. I was able to learn so much about testing and developing software at the same time. Because I am often guilty of neglecting to write my test cases, this type of development is good for getting me more comfortable and into the habit of writing stronger test cases.
Overall, TDD brings reliability, efficiency, and reduced maintenance costs to software development. Its structured testing approach, coupled with comprehensive test cases to optimize the development process, improving the code quality. TDD’s compatibility with CI/CD practices makes it essential for delivering reliable and high-quality software efficiently. I will definitely practice writing code using the TDD method more.
Source: Test-driven development explained by Jacob Schmitt
From the blog Stories by Namson Nguyen on Medium by Namson Nguyen and used with permission of the author. All other rights reserved by the author.