Atlas › 12 Programming for QA › OOP for Testing☰ Read as one page
OOP for Testing
4.1OverviewObject-Oriented Programming is the dominant paradigm for structuring test automation frameworks. The Page Object Model, the most important…4.2Classes for Page ObjectsA class encapsulates data (locators) and behavior (actions) for a single page or component. This separation keeps test files clean and…4.3Inheritance: Base Page ClassesWhen pages share common behavior (navigation bar, footer, common waits), use a base class.4.4Composition: Reusable ComponentsComposition means building pages from independent, reusable components instead of inheriting behavior from parent classes.4.5Encapsulation: Hiding Implementation DetailsPage objects should hide implementation details from tests. Tests should never contain locators, waits, or driver commands.4.6TypeScript Page ObjectsThe same patterns apply in TypeScript with Playwright:4.7Practical ExerciseBuild a page object framework for a simple e-commerce site: 1. Create a BasePage with common utilities (wait, scroll, screenshot) 2. Create…4.8Key Takeaways- Page Object Model is the most important design pattern in UI test automation - One class per page; locators live in the page object…