Guest Konstantin Deltov discusses the importance of design patterns in test automation, highlighting how they can create maintainable, scalable, and extensible frameworks. The conversation focuses on proven solutions, support for object-oriented programming, and extensibility, with examples of patterns such as Page Object Model, Creational Patterns, and Dependency Injection.

Software Testing Unleashed

Software Testing Unleashed - hosted by Richard Seidl. Different guest per episode. The official Show notes contain a comprehensive overview of the episode. Released as audio and video.

• https://www.richard-seidl.com/en/testing-unleashed
• https://www.youtube.com/playlist?list=PL48Mbm-L0hjB1OdwYi9h7jrq9t352-Zk_

Episode Details

• Show Notes: https://www.richard-seidl.com/en/blog/design-pattern-test-automation
• Published: 2026-02-19T05:00:00Z
• Duration: 1173
• Author: Richard Seidl | Software Development & Testing Expert

Overview

The podcast episode focuses on how design patterns can be effectively applied in test automation to build more maintainable, scalable, and extensible testing frameworks. It highlights several important design patterns, including the Page Object Model, Builder, and Facade, and explains how these patterns help in organizing test code, reducing duplication, and improving overall readability. The discussion underscores the need to apply the same level of rigor to test automation code as to production code, advocating for principles such as DRY (Dont Repeat Yourself) and KISS (Keep It Simple, Stupid), while cautioning against overdesign. The episode also addresses the evolving landscape of test automation in the AI era, mentioning the potential use of AI tools like ChatGPT to generate test code, but emphasizes the importance of human review and validation. Finally, it touches on available resources and practical strategies for learning and applying design patterns in test automation effectively.

What If

• What if you implemented the Page Object Model (POM) for your test automation suite today?
  Concrete move: Refactor your existing test scripts to encapsulate UI elements and actions into Page Object classes.
  Why now: Your current test code may have duplicated locators and actions, leading to brittleness and fragility. Applying POM aligns with the texts emphasis on maintainability and DRY principles.
  Expected upside: Reduced code duplication, improved readability, and easier updates when UI elements change saving hours in long-term maintenance.

• What if you designed a Builder pattern to generate complex test data scenarios?
  Concrete move: Create a TestDataReader class using the Builder pattern to dynamically construct test data for edge cases (e.g., nested JSON payloads or multi-step form inputs).
  Why now: The text highlights that Builders separate object creation from representation, which is critical for test scripts dealing with varied data dependencies.
  Expected upside: Flexible, reusable test data generation that reduces boilerplate code and makes test scripts more readable, especially for edge-case testing.

• What if you applied the Facade pattern to simplify your API interaction layer?
  Concrete move: Wrap multiple REST API calls (e.g., user auth, data retrieval, error handling) into a single ApiFacade class that abstracts implementation details.
  Why now: The text stresses that Facades reduce boilerplate by aggregating operations, and your current API tests may be scattered with repetitive HTTP setup.
  Expected upside: Faster test development cycles, centralized error handling, and a cleaner separation of concerns between test logic and API interactions.

Takeaway

• Implement the Page Object Model (POM) to organize UI test automation code by encapsulating web pages into subclasses, reducing duplication, and improving maintainability.
• Apply Dependency Injection in test frameworks to enforce the Dependency Inversion Principle, ensuring modularity and flexibility when integrating third-party tools or services.
• Adhere to DRY and KISS principles by refactoring repetitive code into reusable helpers or Page Objects, and keeping test scripts simple and focused on one objective.
• Learn key design patterns (e.g., Builder, Facade) through resources like Genco 4 Design Patterns or online platforms (Udemy, YouTube), and practice applying them to real-world test automation scenarios.
• Avoid overdesigning by evaluating whether a design pattern adds tangible value to your test frameworkonly adopt patterns that address specific complexity or scalability challenges.