© Hive Studios 2011 Behaviour Driven Development Visual Studio 2010 & SpecFlow Ivan Pavlović, Hive...

© Hive Studios 2011

Behaviour Driven Development Visual Studio 2010 & SpecFlow

Ivan Pavlović, Hive Studios

Visual C# MVP, Certified ScrumMaster

[email protected]

http://msforge.net/blogs/paki

http://twitter.com/ipavlovi

mailto:[email protected]

http://msforge.net/blogs/paki

http://twitter.com/ipavlovi


Agenda• A little bit of slides and a lot of examples

• What is BDD• Language• Tools• Examples


Basic Test Types• Unit testing• Acceptance / Customer testing• Integration testing• Performance testing• Regression testing


Behaviour Driven Development• One of agile techniques• Improves communication between

developers and domain experst• Example driven specification

BDD is a second-generation, outside-in, pull-based, multiple-stakeholder, multiple-scale, high-automation, agile methodology. It describes a cycle of interactions with well-defined outputs, resulting in the delivery of working, tested software that matters. - Dan North (http://dannorth.net/)


Gherkin (kornišon)• Domain Specific Language• Natural human language• Simple syntax– Feature– Background– Scenario, Scenario Outline– Given, When, Then

• Localized to 35+ languages

http://en.wikipedia.org/wiki/File:Gherkins.jpg


Real exampleFeature: Serve coffee In order to earn money Customers should be able to buy coffee at all times

Scenario: Buy last coffee Given there are 1 coffees left in the machine And I have deposited 1$ When I press the coffee button Then I should be served a coffee


Tools• Tools are file generators that consumes

*.feature files and creates test fixtures

• Cucumber – Ruby, http://cukes.info/

• SpecFlow – .NET, http://specflow.org– Nunit, MSTest, MBUnit…

• …and many others

http://cukes.info/

http://cukes.info/

http://specflow.org/


How it works1. BA or user writes a feature and scenarios

and agree with dev that it is doable2. SpecFlow generates one test per scenario3. Developer implements step definitions4. Developer writes just enough code to

make tests green5. Move on to the next scenario


Step Definition Mapping … 7: Given some precondition 8: And some other precondition 9: When some action by the actor10: Then some testable outcome is achieved

[Given(@„some precondition")]public void SomePrecondition() { … do something… }

[Given(@„some other precondition")]public void SomePrecondition() { … do something… }

[When(@„some action by the actor")]public void SomePrecondition() { … do something… }

[Then(@”some verifiable result”)]Public void VerifyResult() { … do assert… }

TEST RUN


DEMO


Arguments - RegEx… 7: Given I have 5 apples 8: And I eat 2 of them 9: When someone asks how many apples I do have 10: Then I should answer “3 apples”

[Given(@„I have (.*) apples")]public void SomePrecondition(int numberOfApples) { … do something… }

[Given(@„ I eat (.*) of them")]public void SomePrecondition(int numberOfEatenApples) { … do something… }

[When(@„ someone asks how many apples I do have")]public void SomePrecondition() { … do something… }

[Then(@” I should answer \“(.*) apples\””)]Public void VerifyResult(int expected) { … do assert of expected … }


DEMO


Scenario outlineScenario: TC1 Add two numbers

Given I have entered 1 into the calculatorAnd I have entered 2 into the calculatorWhen I press addThen the result should be 3 on the screen

Scenario: TC2 Add two numbersGiven I have entered 2 into the calculatorAnd I have entered 2 into the calculatorWhen I press addThen the result should be 4 on the screen


Scenario outlineScenario Outline: TC5Given I have entered <x> into the calculatorAnd I have entered <y> into the calculatorWhen I press addThen the result should be <result> on the screen

Scenarios: addition| x | y | result|| 1 | 2 | 3 || 2 | 2 | 4 || 3 | -3 | 0 |


DEMO


What to Put into Step Definitions

• It is your call• Depend on what you want to test

1. Public Interfaces / Components2. WebUI using browser automation

• WatiN, Selenium

3. WebUI using Request/Respons• Http Get/Post

4. Win UI using automation• White / Windows UI Automation


Resources• Specflow

• http://specflow.org

• Gherkin• https://

github.com/aslakhellesoy/cucumber/wiki/gherkin

• White• http://white.codeplex.com/

• WatiN• http://watiN.sourceforge.net

http://specflow.org/

https://github.com/aslakhellesoy/cucumber/wiki/gherkin



http://white.codeplex.com/



http://watin.sourceforge.net/

http://watin.sourceforge.net/


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© Hive Studios 2011 Behaviour Driven Development Visual Studio 2010 & SpecFlow Ivan Pavlović, Hive...

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