Development without Testers: Myth or Real Option?

DEVELOPMENT WITHOUT TESTERS: MYTH OR REAL OPTION? Mikalai Alimenkou http://xpinjection.com 29.10.2011

Background• Java Technical Lead/Scrum Master at Zoral Labs• 7+ years in software development• 5+ years of working by Agile methodologies• Expert in Agile engineering practices• Founder and coach at XP Injection (http://xpinjection.com)• Organizer of Selenium Camp, JEEConf and XP Days Ukraine conferences

Before start doing something you need to understand it properlyI. WRONG VISION OF TESTINGACTIVITY

Why so many testers?Too many bugs “Brave” automation team Endless regression testing Very quick development

What is the “ideal” dev/tester ratio? Dev Tester ? Devs Tester ? Devs Tester ?X Devs Y Testers ?

Where may problemshappen? Can’t implement what they want Can’t explain requirements Customer Existing functionality is Dev Team broken when new is ready

Developer is the root of evil!

Instead ofcontrollets fix it!

People can’t read minds and any communication channels lose dataII. BROKEN REQUIREMENTSCHANNEL

Divide work in small pieces

Discuss everything in detailsbefore start implementing

Use prototypes and mockups

Make customers acceptresults of development responsibly

Even very good developer can make stupid mistakeIII. DEVELOPERS MAKE MISTAKES

Team design sessionbefore implementation

100% Code Review

Pair programming for the most complex parts

Detailed static code analysis

Stable releasable trunk

Strong definition of DONE Can I start testing this new feature? Yes, it is done! But I can’t even build the product… Ops, I forgot to commit some files...

TDD at all levels ATDD TDDCustomer’s Tests Programmers’ Tests Acceptance Fixtures Production Unit Integration Tests Code Tests Tests

Existing functionality must never be brokenIV. IMPLEMENTED ONCE, WORKINGFOREVER

Build safety net fromcompletely automated tests

Global Continuous Integration

This role is always needed, but can be played by different peopleV. TESTER IS A ROLE, NOT A PERSON

Magic happens when everybody know that there are no testers

Team members canplay different roles

Sharedresponsibility for quality is built

Give development process what it really needsVI. HOW TO SURVIVE? PLAY RIGHTROLE!

Help developers to do slicing development

Perform muchexploratory testing

Help customer toexpress his minds

@xpinjection http://xpinjection.commikalai.alimenkou@xpinjection.com

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Development without Testers: Myth or Real Option?

by Mikalai Alimenkou on Oct 31, 2011

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Development without Testers: Myth or Real Option? — Webinar Transcript