When thinking from that perspective, in the real world scenario, above questions can be interpreted as following: Actions: How they complete each task through specific interaction.Īccording to this framework, while writing tests one should not be thinking about modelling the application or solution or implementation but should be thinking about what the user can do and achieve.Tasks: What will they need to do to achieve these goals?.Goals: Why are they here and what outcome do they hope for?.Marcano got this idea from a user centric design principle which focuses on the answering following questions when trying to model a problem: Screenplay pattern focuses on writing ATs, concentrating on what a user can perform rather than how. This leads to many smaller classes rather than few larger classes making them easier to read and maintain. This means for each method there will be a method class. Screenplay pattern adheres to these principles and states that for each action that an actor can perform, there should be a separate class. OCP states that a class should be open for extension but closed for modification. ![]() SRP states that a class should be responsible for only one responsibility. This often leads to an anti pattern called “Large Class” which is a violation of some SOLID Principles which are SRP (Single Responsibility Principle) and OCP (Open Closed Principle). Hence, with each new element and action, the size of the class increases. When writing acceptance tests using Page Object pattern, for each web page there is corresponding Page Object which contains web elements of the web page and actions, each elements performs. SOLID is a part of Object Oriented Design, specifically: However, I won’t be explaining how to actually write tests using screenplay pattern, as there is a very good blog post on how to do that here. In the sections below, I will explain concepts of SOLID principle, its usage in Screenplay pattern, details about the pattern and motive behind its adoption. He also presents some test codes written using Serenity which adopts the Screenplay pattern and JUnit. Marcano starts the talk by stating the pain points of Page Object pattern and proceeds with stating how Screenplay pattern can help to solve those problems. Marcano himself in between 2007 – 2008 and was refined later by Andy Palmer and Jan Molak. Screenplay pattern (formerly known as the Journey Pattern) is a design pattern to write acceptance tests which is based on SOLID design Principles. I have also looked into some tutorials online (listed at the end), which also contributes to some contents below and my better understanding of the pattern. This blog is based on the talk presented by Antony Marcano on Screenplay pattern, in Selenium conference 2016.
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