java ee behave!!!!
DESCRIPTION
Behavior-driven development (BDD) is an evolution of test-driven development (TDD). It shifts the vocabulary from being test-based to behavior-based and positions itself as a design philosophy. JBehave is a Java framework for BDD, and this session explores how to write integration tests for your Java EE apps with JBehave. It also demonstrates how to leverage the Context and Dependency Injection (CDI) APIs to implement your tests. This session is a must-see for all Java EE developers who want a better way to write integration tests aligned with the intended behavior.TRANSCRIPT
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
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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.”
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
Yep....plain text
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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!”
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
Scenario
• Describes a specific interaction
• Generally fine-grained
• test valid and invalid outcomes
• Support for parametrisation
“Scenario: User signs up with invalid data”
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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.
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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.
base2Services Pty Ltd Commercial in Confidence 2010
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#jeebehave
One Step at a time
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And the config
• Fluent API for specifying configuration
base2Services Pty Ltd Commercial in Confidence 2010
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#jeebehave
{ Demo }Enough Slide-ware
Show me the Code!!!
base2Services Pty Ltd Commercial in Confidence 2010
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#jeebehave
Now lets sprinkle a little bit of JEE on top
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
CDI/Weld
• Contexts and Dependency Injection for Java
• (JSR-299 included in JEE6)
• Weld is the reference implementation
• http://seamframework.org/Weld
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
Inject the Configuration
• Use a CDI @Produces along with a @WeldConfiguration qualifier annotation
• Gets automatically injected into the running scenario
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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
base2Services Pty Ltd Commercial in Confidence 2010
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#jeebehave
{ Demo }Show me a better way!!!
base2Services Pty Ltd Commercial in Confidence 2010
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#jeebehave
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.
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
{ Demo }Now let’s put all this together
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
What’s Next
• Custom CDI Scopes
• @StoryScope, @ScenarioScope
• Arquillian Integration
• ???????
base2Services Pty Ltd Commercial in Confidence 2010
base2Services Pty Ltd 2011
#jeebehave
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