behaviour driven development with cucumber for java … · behaviour driven development with...
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Behaviour Driven Development with Cucumber for Java
Thomas Sundberg
Developer 20+ yearsMaster Degree in Computer Science
I write computer programs.
http://thomassundberg.wordpress.com
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Goal
Introduce Cucumber for Java
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Tools are useless
If you don't know how to use them
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Outline
Why
What
How
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Why
Communication
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Bandwidth
Low High
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A specification
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A specification
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Examples
Create concrete examples
Mark Twain:
There is nothing so annoying as a good example
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Executable
How should the examples be expressed?
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Code
@Testpublic void orderLessThenAMonthBeforeChristmasShouldGiveZeroShipping() { Calendar purchaseDate = GregorianCalendar.getInstance(); purchaseDate.set(Calendar.YEAR, 2012); purchaseDate.set(Calendar.MONTH, Calendar.NOVEMBER); purchaseDate.set(Calendar.DAY_OF_MONTH, 24);
int christmasEve = 24; int expectedShipping = 0; String expectedCurrency = "euro";
Date purchase = purchaseDate.getTime(); Shipping shipping = new Shipping(purchase, christmasEve);
int actualCost = shipping.getCost();
assertThat(actualCost, is(expectedShipping));}
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Scenario
Scenario: Free shipping a month before Christmas Given a customer that Christmas is celebrated 24 of December When a customer buys a book on 2012-12-10 Then the shipping cost should be 0 euro
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@Testpublic void orderLessThenAMonthBeforeChristmasShouldGiveZeroShipping() { Calendar purchaseDate = GregorianCalendar.getInstance(); purchaseDate.set(Calendar.YEAR, 2012); purchaseDate.set(Calendar.MONTH, Calendar.NOVEMBER); purchaseDate.set(Calendar.DAY_OF_MONTH, 24);
int christmasEve = 24; int expectedShipping = 0; String expectedCurrency = "euro";
Date purchase = purchaseDate.getTime(); Shipping shipping = new Shipping(purchase, christmasEve);
int actualCost = shipping.getCost();
assertThat(actualCost, is(expectedShipping));}
Scenario: Free shipping a month before Christmas Given a customer that Christmas is celebrated 24 of December When a customer buys a book on 2012-12-10 Then the shipping cost should be 0 euro
Which is easier to understand?
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Regression testing
Can we deliver?
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Living documentation
These examples are actually working
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What
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Behaviour Driven Development
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Behaviour Driven Development
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Black box
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High level
Not always end to end
Not always through the GUI
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Common language
Used by all involved
Customer
Developers
Testers
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Three core principles
Business and Technology should refer to the same system in the same way
Any system should have an identified, verifiable value
Up-front analysis, design and planning all have a diminishing return
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How
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Tools
Technical Non technical
JBehaveTumbler
JUnit robotframework
FitNesse
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The right tool for the job
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Audience
Readers
Customers
Developers
Maintainers
Product owner
Developers
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Why Cucumber
It is one of the least technical tools
It descends from RSpec
It is a very active open source project
Official release Mars 2012
It supports a variety of languages
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Pattern
Specification
System under test, SUT
Steps – Glue (Native code)
Execute SUT Assert SUT
ExecuteSpecification
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Gherkin
Small API
Features
Scenarios
Background
Scenario outlines
Translated to 47 languages
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Keywords
Given – setup SUT
When – execute SUT
Then – verify SUT
And, But – flow to the language
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Gherkin example
Feature: Hello World
Scenario: Say hello
Given I have a hello app with "Howdy"
When I ask it to say hi
Then it should answer with "Howdy World"
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Advantages
Easy to read
Easy to understand
Easy to discuss
Easy to parse
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Features
Order not relevant
When
Given
Then
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Backgrounds
Executed before each scenario
Powerful
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Scenario outline
Substitute keywords with values from a table
Each row in the table makes up one scenario
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Steps – Glue
Java methods
Global
You can't describe two different things with the same words
Annotated with the keywords
Found by regular expressions
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An example
@When("^I add (\\d+) copies the (.*) book$")
public void methodName(int copies, String title) throws Throwable {
StepHelper stepHelper = new StepHelper();
stepHelper.addCopies(title, copies);
}
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Hooks
@Before
@After
Executed before or after each step
Very often
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Transformers
Transform a String to a class@When("^a customer buys a book on (.*)$")
public void methodName(@Format("yyyy-MM-dd") Date purchaseDate) throws Throwable {
this.purchaseDate = purchaseDate;
}
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Drivers
JUnit
Command line
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Continuous Integration
Maven
Ant
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Example
A Maven project
Simple model
Use a Continuous Integration server
Extend to a web application
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Live coding
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Small example
All large systems consists of small pieces
You can only view a small portion of a system at one time
~30 – 50 loc
http://www.casualmiracles.com/2010/02/21/large-systems/
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Workflow
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1. Describe the behaviour in plain text
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2. Write a step definition in Ruby
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2. Write a step definition in Ruby Java
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3. Run it and watch it fail
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4. Write code to make the step pass
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5. Run it again and see the step pass
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6. Repeat step 2 – 5 until green like a Cuke
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7. Repeat step 1 – 6 until the money runs out
1. Describe the behaviour in plain text
2. Write a step definition
3. Run it and watch it fail
4. Write code to make the step pass
5. Run it again and see the step pass
6. Repeat step 2 – 5 until green like a Cuke
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Why
Communication
Regression testing
Living documentation
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What
Behaviour
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How
Features
Scenarios
Glue code
System under test
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Continuous Integration
Preparation for fast deployment
It works as we have specified
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Declarative
Don't write scripts
Define what should work
No implementation details
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Cucumber is a good hammer
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All problems are not nails
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Right tool for the right problem
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Do not focus on the tools
Tools will never solve the problem
A fool with a tool is still a fool
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Resources
Cucumber – http://cukes.info/
Cucumber – https://github.com/cucumber/cucumber/wiki
Gherkin – https://github.com/cucumber/cucumber/wiki/Gherkin
Selenium – http://seleniumhq.org/
Maven – http://maven.apache.org/
Jenkins – http://jenkins-ci.org/
Blog – http://thomassundberg.wordpress.com/
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Behaviour Driven Development with Cucumber for Java
Thomas Sundberg
Developer 20+ yearsMaster Degree in Computer Science
I write computer programs.
http://thomassundberg.wordpress.com