Test automation_strategy_for_legacysystems

-Jayaprakash Puttaswamy
Test Automation Strategies
for Legacy Systems

What thoughts come to your
mind?

Copyright © 2016 Aritha Consulting Services Pvt. Ltd. All rights reserved. www.arithaconsulting.com
 Legacy Systems : challenges (05 mins)
 Test Automation : the full puzzle (15 mins)
 Refactoring Legacy Code (10 mins)
1.Shortest/Deepest branch technique
2.Applying Strangulation (Strangler pattern)
 Q&A (10 mins)
Next 40 mins!

Legacy Systems - challenges
1. Lack of Agile Testing Mind-set
• Defect prevention Vs detection
• Developer Vs QA mind-set
2. Lack of Domain knowledge
• Unclear or vague requirements
• Lack of domain knowledge for multiple components
3. Lack of Technical Infrastructure
• Relevant testing tools and frameworks
• No infrastructure to mock/simulate dependencies (hardware/third party software)
4. Lack of Technical Skills
• Inability to distinguish and write Unit Tests, Integration Tests and End-to-End tests
• Quality of Testing (especially Unit Testing)
• Lack of refactoring skills/techniques

Test Automation - the full puzzle
•Unit testing tools for with
mocking support
•Ability to run test
independently at different
levels
•Testing from Bottom-up
approach (Agile Testing
Pyramid)
•Writing good quality tests
•Usage of mocks
•Vertical slicing while
breaking down tasks
•Distinguishing between
Functional, Integration &
Unit testing
•Clear and refined
Acceptance Criteria
•Alignment between User
Story conversations and
their refinement
1. Clarity on
User Story
and A.C.
2. Thinking
through
about
types/level of
Testing
3. Testing
infrastructure
and tools
4. Testing
skills

STP (See-through Pyramid)
Image Source:
http://www.molon.de/galleries/France/Paris/Louvre/images01/15%20Louvr
e%20glass%20pyramid%20at%20sunset.jpg
Image Source: http://martinfowler.com/bliki/TestPyramid.html
Agile Testing Pyramid
STP (See-through Pyramid)

Agile Testing Quadrants
Source: http://lisacrispin.com/2011/11/08/using-the-agile-testing-quadrants/

Ex: Component/Technology Stack
Portal UI [HRML/CSS]
Portal Widget Framework
[Bootstrap, jQuery]
Portlets [Liferay
Portlets, Java]
Group Security Engine
[Spring, Hibernate, Java]
Authorization Engine
[OAuth]

1. Check if you have clarity on Feature/User Stories/Scenarios
2. If needed, derive more BDD Scenarios
3. Identify the scenario flows through layers/components of your application architecture
4. Evaluate the Impact on the code block that may get modified
5. Evaluate the Stability of the Impacted coded block
6. Identify and implement minimal code/tests that need refactoring and automation (only if
Impact is HIGH and is currently UNSTABLE)
7. Identify units where business logic gets added or modified. There are natural candidates for
Unit testing
8. Identify integration and end-to-end scenarios between units that need testing
Testing Approach for Legacy System

Refactoring Legacy Code
Source: Video by Sandra Mancuso - https://www.youtube.com/watch?v=_NnElPO5BU0

Refactoring Legacy Code
Image source: http://www.ferdinandludwig.com/plant-addition.html
Strangulation
(based on EventInterception and AssetCapture strategies)

http://in.linkedin.com/in/jputtaswamy
jayaprakash@arithaconsulting.com
@agilejp
@arithatweet
About me
Let’s connect
Jayaprakash Puttaswamy (JP) works as a Director - Technology &
Consulting at Aritha Consulting Services and consults enterprises
in Agile and Agile-BI space.
 Agile Strategist, Coach and an Enabler
 Practicing agile since 12 years (RUP,
XP, Scrum, Lean & Kanban)
 Trained & coached over 1400
professionals spread across 150 plus
teams in 35 plus companies including
start-ups.
 Driven large-scale agile
transformation (both software & non-
software) for global enterprises with
scale of 50 to 4000 people.

Image courtesy of David Castillo Dominici / FreeDigitalPhotos.net
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Test automation_strategy_for_legacysystems

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