Download pdf - Java EE Behave!!!!

base2Services Pty Ltd Commercial in Confidence 2010#jeebehave

Java EE Behave!!!!Behaviour-Driven Development with Java EE

Aaron [email protected]

@aaronwalkerhttp://aaronwalker.me

http://www.base2services.com

base2Services Pty Ltd Commercial in Confidence 2010

base2Services Pty Ltd 2011

#jeebehave

Agenda

• What is this BDD thingy

• JBehave

• How to make your tests behave!

• { Demo }

• Java EE flavouring

• { Demo }

• Q & A



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BDD ~ Behaviour Driven Development ~

“BDD facilitates agile development, which is an approach to develop functional software, within

reasonable timeline, making everyone happy, without killing anyone, orburning down any bank.”



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BDD's Core Principles

• It's all behaviour“The business & technology people should be speaking the same words when referring to the same idea,there should not be any translator.”

Behaviour: the addition of N values should yield the summation of them

Example: the addition of 2 + 4 + 2 should yield 8



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BDD's Core Principles

• The evolution of test-driven development (TDD) and acceptance-test driven design

• Shifts the vocabulary from being test-based to behaviour-based

• Essentially a design philosophy

base2Services Pty Ltd Commercial in Confidence 2010#jeebehave

Unit testing frameworks mismatch

It’s all about the Behaviour



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Oh JBehave• a framework for Behaviour-Driven

Development.

• pure Java implementation

• Users can specify and run plain text-based user stories

• Annotation-based configuration and Steps class specifications

• Dependency Injection support (more on this one later)

• Tool/IDE integration

• Ant, Maven, Selenium, Eclipse, IntelliJ, Netbeans



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Yep....plain text



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Narrative

• Describes the overall intent of the story

• Generally describes a single feature or use case

• Should include any participating actors

“In order to learn about BDD and JBehave as a JavaOne attendee I will attend session 24421- JEE Behave!”



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Scenario

• Describes a specific interaction

• Generally fine-grained

• test valid and invalid outcomes

• Support for parametrisation

“Scenario: User signs up with invalid data”



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Given|When|Then|And

• Given ... setting up system to a known state

• When ... exercising an event

• Then ... verifying an outcome

• And ... used to chain multiple Given, When and Then statements



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So where’s the Java?• Mapping Textual Scenario Steps to Java Methods via

annotations

• Steps instances may inherit or implement other class/interface as required by the model of the application under test.

• allows many different ways to configure Embeddable Java classes

• ConfigurableEmbedder: allows the specification of the Configuration and CandidateSteps.

• InjectableEmbedder: allows the injection of a fully specified Embedder.



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JUnit

• JUnit is supported out-of-the-box via several Embeddables implementations:

• JUnitStory: provides a one-to-one mapping with the textual story via the StoryPathResolver.

• JUnitStories: provides a many-to-one mapping with the textual story paths explicitly specified by overriding the storyPaths() method.



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One Step at a time



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And the config

• Fluent API for specifying configuration



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{ Demo }Enough Slide-ware

Show me the Code!!!



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Now lets sprinkle a little bit of JEE on top



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CDI/Weld

• Contexts and Dependency Injection for Java

• (JSR-299 included in JEE6)

• Weld is the reference implementation

• http://seamframework.org/Weld



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JBehave CDI support

• jbehave-weld module

• Uses Weld Java-SE integration to bootstrap the CDI container

• can inject configuration and steps using CDI annotations

• greatly simplifies the configuration and management of step classes



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Inject the Configuration

• Use a CDI @Produces along with a @WeldConfiguration qualifier annotation

• Gets automatically injected into the running scenario



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What about the Steps

• Simply mark Step classes with a @WeldStep annotation

• They get automatically added as candidate steps

• Steps can use @Inject to inject dependencies



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{ Demo }Show me a better way!!!



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JBehave Web

• JBehave Web is an extension of the JBehave framework providing a web integration layer

• Features include:

• Web Queue to allow generic stories to be run asynchronously via a simple web interface.

• Web Runner to allow generic stories to be run synchronously via a simple web interface.

• Selenium integration module to allow automation of stories for web applications using Selenium.



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{ Demo }Now let’s put all this together



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System Integration Testing

• JBehave is a good language for describing system integration

• BA’s, QA’s, architects, and developers are all speaking the same language

• Self documented acceptance tests



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What’s Next

• Custom CDI Scopes

• @StoryScope, @ScenarioScope

• Arquillian Integration

• ???????



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Q & A

• http://behaviour-driven.org/

• http://jbehave.org - JBehave project site

• github.com/aaronwalker/JavaOne2011 - demo code

• http://aaronwalker.me - blog

• [email protected] - email

• @aaronwalker - twitter