In this Skill Sprint I introduce behavior driven development principles, tell a few words about Gherkin language and demonstrate how this can be applied to Delphi programming.

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Behavior Driven
Development
Roman Yankovsky
roman@yankovsky.me
http://roman.yankovsky.me/
http://plus.google.com/+RomanYankovsky/
12th August, 2014
Download a free trial – NOW!
http://embt.co/trialdownloads

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This Skill Sprint Works with . . .
• Windows
• OS X
• Android
• iOS
• RAD Studio
• Appmethod
• Object Pascal
• C++
• RAD Studio XE6 DocWiki
– http://embt.co/raddocwiki
– http://docwiki.embarcadero.com/RADStudio/XE6/en/
• Appmethod 1.14 DocWiki
– http://embt.co/appmethoddocwiki
– http://docwiki.appmethod.com/appmethod/1.14/topics/en/
• Appmethod supports the FireMonkey
framework on all 4 platforms while RAD
Studio, Delphi and C++Builder also support
VCL on Windows. Contact sales with any
questions!

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Communication is the Key
Customer :=
TCustomer.Create;
…
We would like to
encourage new users
to buy in your shop.
Therefore we offer
10% discount for their
first order.
1. Register a user
2. Order a book
3. Verify price
Product Owner Software Engineer QA

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Shared Understanding
Product Owner Software Engineer QA
Given the user has not ordered yet
When the user adds a book with the price of EUR 10 into his shopping cart
Then the shopping cart sub-total is EUR 9

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Behavior Driven Development
Gherkin
Business Readable, Domain Specific Language that lets you describe software’s behaviour
without detailing how that behaviour is implemented.
https://github.com/cucumber/cucumber/wiki/Gherkin
I do think that the greatest potential benefit of DSLs comes when business people participate
directly in the writing of the DSL code. The sweet spot, however is in making DSLs business-
readable rather than business-writeable. If business people are able to look at the DSL code and
understand it, then we can build a deep and rich communication channel between software
development and the underlying domain.
© Martin Fowler

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User Story in BDD
In order to …
As a …
I want …

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User Story in BDD
In order to avoid silly mistakes
As a math idiot
I want to be told the sum of two numbers

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User Story in BDD
Context
Event
Outcome
Scenario:

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User Story in BDD
Context
Event
Outcome
Scenario:
GIVEN

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User Story in BDD
Context
Event
Outcome
Scenario:
GIVEN
WHEN

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User Story in BDD
Context
Event
Outcome
Scenario:
GIVEN
WHEN
THEN

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User Story in BDD
Feature: Calculator
In order to avoid silly mistakes
As a math idiot
I want to be told the sum and the multiplication of two numbers
Scenario: Add two numbers
Given I have entered 50 in calculator
And I have entered 50 in calculator
When I press Add
Then the result should be 100 on the screen

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DEMONSTRATION
DelphiSpec

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Resources
• DelphiSpec
– https://github.com/RomanYankovsky/DelphiSpec
• Samples
– https://github.com/RomanYankovsky/DelphiSpec/tree/master/Demo
• Gherkin
– https://github.com/cucumber/cucumber/wiki/Gherkin
• Blog Posts
– http://roman.yankovsky.me/?p=1299
– http://roman.yankovsky.me/?p=1458
– http://roman.yankovsky.me/?p=1648
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Q & A
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@EmbarcaderoTech