Behavior Driven Development Pros and Cons

Nov 13, 2011Download as PPT, PDF5 likes25,355 views

The Cons of Behavior Driven Development (BDD) Ivan Bobrov, ClubQA Co-Founder, Kostroma The Pros of Behavior Driven Development (BDD): Business User Scenarios Natalia Zaitseva, Exchange Functional Test Automation Lead Innovative Trading Systems EXTENT Conference. October 29-30, 2011 Test Automation for Trading Systems Renaissance Hotel Moscow

The Pros of Behavior Driven Development (BDD): Business User Scenarios Natalya Zaytseva Exactpro Systems LLC

Test Driven Development (TDD) Test Failed Add a test Test Passed Update the code Refactor

Test Driven Development (TDD) Benefits Unit tests prove that code actually works Refactoring allows to improve the design of the code Low-level regression test suite Test-first reduces the cost of bugs Drawbacks Developers can consider it as a waste of time Anticipation by developers the concept of “Testing” The tests can be targeted on verification of classes and methods and not on what the code really should do

Behavior Driven Development (BDD) Shifting from thinking in “tests” to thinking in “behavior” Collaboration between Business stakeholders, Business Analysts, QA team and Developers Ubiquitous language .

Behavior Driven Development (BDD) Approach a feature4 QA Analyst Ubiquitous language Behavior feature1 feature3 QA Analyst Scenarios Class Developer

BDD: Business Scenarios Story: [Narrative] As a Role I request a Feature To gain a Benefit Scenario Given [context] AND [some more context] When [Event] Then [Outcome] And [Another Outcome]

BDD Cons Ivan Bobrov EXTENT October 2011

Is it easy to describe? Scenario: An Artist creates an art work Given I am a registered artist And I am on my dashboard And I follow "Add an artwork" within "#dashboard" When I fill in "Title" with "The Portrait" And I fill in "Description" with "A nice portrait." And I select "Painting" from "Category" And I attach “ portret .jpg" to "Select picture" And I press "Create" Then I should see "The Portrait " was successfully added to your art collection

A Client and BDD is Face to Face With every new project I hoped that Cucumber can become one of the communication tools between our team and the customer. Only once I managed to get the customer write the scenarios , however the quality wasn't good and they had to be rewritten by a developer It was difficult to convince the customer to review the scenarios on a daily basis . They preferred writing a document or using a ticketing system like Redmine. The result is that we have requirements in 2 places - tickets and scenarios Andrzej Krzywda

Are developers ready for BDD? A developer often writes specifications Specs are very detailed Scripts, scenarios or a manual? Easy to understand

BDD doesn’t show a real life In BBD Scenario NewOrderSingle where SecurityID=S1 and Price=P1 and Side=BUY and Quantity=Q1 … In Real Life Initialize TCP connection Send Logon to the GW Wait for Logon response Start sending HeartBeats Send NewOrderSingle with ….

Release A Product is ready to use BDD it’s a design tool

Behaviour-driven development (BDD) started as an improved variation on test-driven development, but has evolved to become a formidable tool that helps teams communicate more effectively about requirements, using conversation and concrete examples to discover what features really matter to the business. BDD helps teams focus not only on building features that work, but on ensuring that the features they deliver are the ones that the client actually needs. In this talk, we will discuss what BDD is about, its benefits, and how it affects teams and processes. We will discuss two case studies where BDD practices have been successfully introduced, including the benefits gained and challenges met. We will see how much benefit was gained when BDD was integrated into the broader development infrastructure, including issue tracking systems, requirements management, and project reporting. We will also see how BDD can be applied to all levels of the development process, from requirements down to low-level coding. We will also look at the principle BDD tools available that can help teams implement executable specifications, BDD-style test automation, and living documentation effectively. Some of the tools discussed will include JBehave, Cucumber, Specflow, Jasmine and Spock. We will also look at two case studies where BDD practices have been successfully integrated into several projects in large government and financial organizations. Teams that adopted BDD effectively benefited from significantly lower defect rates, much earlier discovery of errors and inconsistencies in the requirements, and better overall communication and collaboration within the team. However, practicing BDD does involve a significant change in mind-set compared to more traditional approaches, a different collaboration model between team members, and a high degree of stakeholder by-in and engagement, all of which should not be underestimated. We will discuss how the teams managed these various challenges during their BDD adoption story.

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1. The Pros of Behavior Driven Development (BDD): Business User Scenarios Natalya Zaytseva Exactpro Systems LLC

2. Test Driven Development (TDD) Test Failed Add a test Test Passed Update the code Refactor

3. Test Driven Development (TDD) Benefits Unit tests prove that code actually works Refactoring allows to improve the design of the code Low-level regression test suite Test-first reduces the cost of bugs Drawbacks Developers can consider it as a waste of time Anticipation by developers the concept of “Testing” The tests can be targeted on verification of classes and methods and not on what the code really should do

4. Behavior Driven Development (BDD) Shifting from thinking in “tests” to thinking in “behavior” Collaboration between Business stakeholders, Business Analysts, QA team and Developers Ubiquitous language .

5. Behavior Driven Development (BDD) Approach a feature4 QA Analyst Ubiquitous language Behavior feature1 feature3 QA Analyst Scenarios Class Developer

6. BDD: Business Scenarios Story: [Narrative] As a Role I request a Feature To gain a Benefit Scenario Given [context] AND [some more context] When [Event] Then [Outcome] And [Another Outcome]

7. BDD Cons Ivan Bobrov EXTENT October 2011

8. The Beginning

9. Is it easy to describe? Scenario: An Artist creates an art work Given I am a registered artist And I am on my dashboard And I follow "Add an artwork" within "#dashboard" When I fill in "Title" with "The Portrait" And I fill in "Description" with "A nice portrait." And I select "Painting" from "Category" And I attach “ portret .jpg" to "Select picture" And I press "Create" Then I should see "The Portrait " was successfully added to your art collection

10. A Client and BDD is Face to Face With every new project I hoped that Cucumber can become one of the communication tools between our team and the customer. Only once I managed to get the customer write the scenarios , however the quality wasn't good and they had to be rewritten by a developer It was difficult to convince the customer to review the scenarios on a daily basis . They preferred writing a document or using a ticketing system like Redmine. The result is that we have requirements in 2 places - tickets and scenarios Andrzej Krzywda

11. Are developers ready for BDD? A developer often writes specifications Specs are very detailed Scripts, scenarios or a manual? Easy to understand

12. BDD doesn’t show a real life In BBD Scenario NewOrderSingle where SecurityID=S1 and Price=P1 and Side=BUY and Quantity=Q1 … In Real Life Initialize TCP connection Send Logon to the GW Wait for Logon response Start sending HeartBeats Send NewOrderSingle with ….

13. Release A Product is ready to use BDD it’s a design tool

14. 1770 year

15. 2011 year

16. Thank you.

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