Chapter 3.5.4: Crafting high-quality Component Tests
Unlock the potential of Component Tests in Test-Driven Development to create high-quality, maintainable software.
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Now let's explore the vital role of Component Tests within the TDD cycle. We will examine how to complement Application Tests with Component Tests best, emphasizing the importance of striking a balance between the two to achieve optimal results and deliver a high-quality user experience. As we proceed, we discuss how to create decoupled Component Tests by leveraging the best practices and setup shared in previous chapters. Furthermore, we'll look at how to build small, focused, and, therefore, easily testable components. Finally, I want to emphasize the crucial aspects of testing edge cases and error scenarios through Component Tests, providing practical examples and strategies for ensuring our Vue.js components are robust and ready for production use.
Integrating Component Tests in the TDD Cycle
In the TDD cycle, Component Tests play a vital role in ensuring that single components behave as expected. Nevertheless, beginning with an Application Test is crucial when working on a new feature. Doing so provides a clear direction and indicates when we've finished the whole feature. However, as we progress through the development process, working to fulfill a single Application Test, we may as well create multiple Component and Unit Tests, each with its own Red-Green-Refactor phases. These tests turn green one by one, eventually leading to the Application Test turning green too.
To illustrate this point, let's consider our shopping list application again. Imagine we want to add a removal feature. Again we first write an Application Test that verifies the expected behavior from a user's perspective. But then, we also create a Component Test for the ShoppingList
component.
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