Exploring Test-Driven Development

TDD is an approach where tests are intentionally written before the code itself, but it’s more than just writing tests first—TDD is a disciplined methodology that guides the entire development process. In TDD, development follows a structured cycle: the process begins with creating a test for the desired functionality. Then, code is written to ensure the test succeeds. Once the test passes, the code is refined to enhance its organization and clarity. Figure 12.8 illustrates this TDD workflow.

Figure 12.8: TDD process

The process when working with TDD is as follows:

1. Red: Start by writing a test defining a small functionality piece. Since the feature doesn’t exist yet, the test will initially fail, signaling that code is needed to make it pass.
2. Green: Write the minimal amount of code required to pass the test. The goal is to keep the code simple and focus on meeting the test requirements...