A TDD Metaprocess
Explore the TDD metaprocess for Rails models, focusing on writing initial state tests, addressing main logic cases one at a time, and refining code through refactoring. Understand how to build robust features incrementally and maintain test coverage while handling special cases.
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The following diagram illustrates a metaprocess that reflects how we can write a new business logic feature. This process is more of a guideline than a strict checklist. As the logic becomes more complex and the less we know about the implementation when we start, the closer we stick to this process and the smaller the steps we take.
Initialization as a starting point
Often, the best place to start is with a test that describes the system’s initial state without invoking logic. This is especially useful if we’re test-driving a new class, so the first test sets up the class and verifies the initial state of instance variables. If we’re ...