I brought you some theory here :)

This chapter is theoretical, but it's worth knowing about this type of development because it's sometimes used, and you might want to write your methods in this way.

Let's start with the definition:

This method of development has its principles, advantages, and disadvantages. As you may have understood, we first write unit tests for a method and then write the code that will pass these tests. This way, the code becomes more reliable, and it is less likely to have errors that are not covered by tests.

Let's look at the main principles:

Key Principles of TDD

1. Writing a Test: Start by writing a test for the new functionality. Initially, this test will fail because the functionality is not yet implemented;
2. Writing Code: Next, write the minimal code necessary for the test to pass successfully;
3. Refactoring: After the test passes, the code is optimized for quality and readability;
4. Repeat the Cycle: The process is repeated for each new feature or improvement in the program.

Let's now talk about the pros and cons of this approach. Let's start with the advantages:

Advantages of TDD

1. Improved Code Design: TDD helps developers focus on requirements before writing code, leading to cleaner and optimized code design;
2. Reduced Error Rate: Since tests are written beforehand, the likelihood of missing errors is reduced;
3. Ease of Refactoring: With tests in place, developers can confidently refactor without worrying about unforeseen consequences;
4. Code Documentation: TDD tests also serve as a form of documentation, illustrating how the code is intended to be used.

Test-Driven Development (TDD) in Java, like any other methodology, has its drawbacks and limitations.

Here are some of the main disadvantages of TDD:

Disadvantages of TDD

1. Steep Learning Curve
   • Complexity for Novices: Developers unfamiliar with TDD may find it challenging to start using this approach. It requires an understanding of how to write effective tests and develop with tests in mind;
   • Discipline Requirement: TDD demands strict discipline and sequence in writing tests before code, which can be challenging to maintain.
2. Increased Initial Time Investment
   • Initial Slowdown: TDD development can take more time at the project's initial stages due to the need to write tests before implementing functionality;
   • Rethinking Logic: Developers may spend time rethinking application logic to align with tests, leading to occasional delays.
3. Test Code Maintenance
   • Test Maintenance and Updates: Keeping tests up to date when changing the application code can be labor-intensive;
   • Codebase Growth: The codebase grows due to the addition of a large number of tests, which can complicate project maintenance and understanding.

Conclusion

Whether to use TDD or not is your choice. This approach has its pros and cons, as described above. You can assess your abilities and try using this approach, or you can choose to ignore it, but it's essential to be aware of its existence. I'll let you in on a secret: I sometimes use this approach myself, but it requires a significant amount of time and focus.