Behavior Driven Development (BDD)

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Behavior DrivenDevelopment (BDD)By Nabeel Ibrahim

About Me Quality Engineer at Slalom Consulting 8 years testing experience Experience with Web and Mobile automation Test strategy creation Love soccer Love to travel Summer guy

What is BDD? TDD overview Three amigos Ubiquitous language Gherkin (Given When Then) How do I switch to BDD?Outline Automation Three Amigos meeting Advantages and Challenges Cucumber SpecFlow Feature Files Step Definitions Reports Living documentation - Pickles

What isBDD?” BDD is a second-generation,outside-in, pull-based, multiplestakeholder, multiple-scale, highautomation, agile methodology. Itdescribes a cycle of interactions withwell-defined outputs, resulting in thedelivery of working, tested softwarethat matters.” –Dan North

Test Driven Development What is TDD? Define a test set for the feature/unit first Make the tests fail; Then implement the feature/unit; Finally verify that the implementation of the unitmakes the tests succeed Non specific Tests written as high level requirements OR Low level technical details Cost of translationFigure 1: TDD /

Tests specified in terms of desired behaviorBehaviorDrivenDevelopment Desired behavior – High level businessrequirements Provide scenarios/real world examples Illustrate behavior in an ubiquitous language Gherkin syntax Describe the what and not the how Automate scenarios

Productowner/BusinessanalystThreeAmigos Determine valueof featuresDevelopers Feature detailand complexityQA Look for flaws inthe system

Feature: Add or remove items from cartAs a customer,I want to be able to view the items in my cartUser Story(Traditional)so that I know for sure what I’m purchasingAcceptance criteria Display the name of each item in the shopping cart. Display the quantity of each item in the shopping cart. Allow the user to remove any items in the shopping cart.

Feature: Add or remove items from cartAs a customer,I want to be able to view the items in my cartso that I know for sure what I’m purchasingScenario 1: User is able to add items to cartGiven there are no items in the cartAnd I am on the clothing pageWhen I add the following items to cart:User Story(BDD style)Product NameBDD XL ShirtQuantity1Then there should be 1 item in the cart named ‘BDD’Scenario 2: User is able to remove items from the cartGiven the following items are in the cartProduct NameQuantityBDD XL Shirt1TDD XL Shirt5Jeans6When I remove all the items named ‘Jeans’Then I should have 6 items in the cartAnd there should be no items named ‘Jeans’

How do I switch to uld-lead-bdd/

Traditional Sprint IssuesCost of translation Dev code business thinking Refinement stories Production delayStories sent to QAvery late in sprint Automation lagsbehind Stories notcompleted Affects velocity


Step 1: AutomateBDD frameworkof choiceAutomate corefeaturesSpecFlow(C#), JBehave(Java)Basic and mostuseful steps incode baseClassify newtest scenarioseasilyCouple ofsprints tostabilizeCreate livingdocumentationPickles (OpenSource)

Step 2: Three Amigos should-lead-bdd/

Step 2: Three Amigos MeetingScheduleThree AmigosmeetingDemoautomation,living docLets all writeScenarios!!!!!PO, Dev,QA

Step 3: User stories BDD ould-lead-bdd/

Advantages of BDD Highly collaborative process Entire team constantly talking toeach other Solve problems together All input valuable User stories written in astandardized format Good with any Agile Frameworki.e. Scrum, Kanban etc. Focuses on Behavior Minimizes cost of translation

Challengesof BDD Change is not easy! Business may not want to learn Gherkin Dev/Other QA learning curve Two extra layers (Feature files Step definitions)

Cucumber Translates Gherkin steps into executablecode Open source Used in several BDD frameworks SpecFlow JBehave RSpec Integrates with: Cloud services (Browserstack, SauceLabs) Test Management tools (TestRail) Bug tracking tools (Jira)

Cucumber Continued


3 Formats: HTML, Excel, Word Windows Package manager (chocolatey) , GUI Open Source CI Integration - TeamCity

1. Who Should Lead BDD? (2017, June 22). Retrieved June13, 2018, uldlead-bdd/References2. BDD: Learn about Behavior Driven Development. (2018,February 13). Retrieved June 13, 2018, from (filters (postType ( 'page 'post 'aa book 'aa event session 'aa experience report 'aa glossary 'aa research paper 'aa video) tags ( 'bdd)) searchTerm ' sort false sortDirection 'asc page 1)3. D. (2016, August 03). Behaviour Driven Development. Abetter Agile? – The Reading Room – Medium. RetrievedJune 13, 2018, from n-development-a-better-agile778d2d2a7ab54. Rombauts, D. (n.d.). Pickles - the open source LivingDocumentation Generator. Retrieved June 13, 2018,from

Feature: Add or remove items from cart As a customer, I want to be able to view the items in my cart so that I know for sure what I’m purchasing Acceptance criteria Display the name of each item in the shopping cart. Display the quantity of each item in the shopping cart. Allow the user t

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Focus is on the business value that a customer should get from the software It helps to make requirements clear to everyone (Product owners, Business analysts, Programmers and Testers) It avoids misunderstandings what the feature is and how it could be delivered It combines the specification and the test itself Behaviour-Driven Development (BDD)

Verbal Behavior Verbal Behavior (V) is a class of behavior that is reinforced through the mediation of other persons (Skinner, 1957, p.2). Verbal Behavior is the application of behavior principles to language. Verbal Behavior categorizes language responses into different categories based on the function of the response Verbal Behavior is a subset of the science of Behavior Analysis

an implementation of these things in a book or article on Domain-Driven Design. For me personally, Domain-Driven Design is one the most interesting subjects in software development today. There is so much to discover, and there are many subjects related to it: Agile software development, TDD, and . BDD, but also living documentation, visualization,