The document presents a comprehensive overview of design patterns in test automation, highlighting key frameworks like the page object pattern, singleton pattern, and fluent interface. It discusses the importance of implementing design patterns for effective automation frameworks, focusing on reusability and maintenance while providing code snippets and real-world applications. The paper emphasizes the role of test automation in enhancing efficiency and return on investment.

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Design Patterns in Test Automation
Shrinathacharya L M, Principal Quality Engineer, Allscripts
27th September 2018

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Schematic Diagram

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Tester is Coder!!
How many of you think?

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Tester is also a Designer!!
How many of you think?

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For every successful test automation, how best framework is built, what are the
design patterns implemented in framework matters a lot.
This paper talks about design patterns implementation in test automation
framework starting from reusability, singleton, page object pattern, fluent
interface (Method chaining) and talk on different types of automation
framework. Also talk on how these patterns help in defining success of test
automation and return on investment for test automation.
This paper also gives the code snippet with example in explanation and
advantages of using it.
Abstract

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What is Test Automation?
 Developing the automation scripts for the test cases by writing
code/script in C# or many other coding languages.
 Involves design test automation framework
 Implement design pattern in automation framework
 Implement to generating execution reports
 Develop utilities around automation

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3 Mantra’s for Successful Test Automation
 Cost of Scripts Development
 Apply AI algorithms to auto generate scripts
 Cost of Maintenance
 Execution Efficiency

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Design Patterns used in Test Automation
 Page object pattern
 Fluent Interface (Method Chaining)
 Singleton pattern
 Facade design pattern
 Strategy design pattern
 Observer design pattern

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Test Automation Frameworks
• Data is pulled from flat file, excel, DB for
inputs
Data Driven
Framework
• Extension of data driven framework with
action to be performed on application under
test.
Keyword Driven
Framework
• Combination of more than one framework
Hybrid testing
framework
• Separating automation test scripts with
module level scripts by abstraction layer for
reusability and maintenance.
Model Based
Framework
• Functional validation with set of rules.
Behavior driven
framework

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Architecture of Model Based Framework

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Page Object Pattern

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Page Object Pattern – C# Code in Test Script

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Singleton Design Pattern– C# Code in Test Script
• A class with only one instance and provide a global point of access to it

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Model Based Framework Advantage
 Cost of Maintenance of automation scripts is easy
 Avoids duplication of code
 Modify code at single place
 Cost of Script development of automation script is cheaper
 Greater Coverage of automating test cases
 Page Object Pattern supports with reusability
 Singleton – Only one instance of object created with global point
of access.

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Fluent Interface (Method Chaining) Pattern
 Method Chaining within a Class
 Method Chaining with Multiple Class

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Typical Coding of Property Class and Usage

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Implementing Method Chaining in Single Class in C#

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Implementing Fluent Interface for Multiple Class in C#

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Continue…

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Advantages & Usage
 Used in Unit Testing and Automation Testing
 Readable and simple to understand by others
 Used in framework development and query based support
programming

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Test Automation Tools which supports C#

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Overcoming the challenges in Test Automation
 Implementing Design Patterns which are required for Test
Automation
 Direct access to third part WebAPI’s in case of complexities.
 Generating Web Based Reports
 Integrate with Test Management Tools (Ex: MTM- Microsoft
Test Management Tool)

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Author Biography
Shrinathacharya L M
Principal Quality Engineer
shrinathacharya.lm@allscripts.com
Allscripts
• Developer by profession | Automation tester by heart
| .NET programmer | Innovator
• TechGig Percentile in C# 98.65
• Patents filed as USPTO
• Specialist in automation framework development
• 15+ years of experience in development, automation (Web,
Windows, Mobile applications), Innovation
• Member of technology committee at Allscripts
• Speaker for Global Testing Retreat-2017 Conference,
DevOps++ Summit, Panel member -Selenium Summit-20178
• Speaker at ATA 13th Meetup, DotNetBLR meetup
• Published white paper in STC-2015, STC-2016
• Jury for STC-2018

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Question and Answers

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Thank You!!!