Cucumber on the JVM with Groovy

Cucumber on the JVM with
Groovy
cucumber, cuke4duke, groovy, geb

Richard Paul 2011-03-24

What is Groovy

• Dynamic language for the JVM
• Inspired by Python, Ruby, Smalltalk
• Integrates closely with Java
• Superset of Java syntax

http://groovy.codehaus.org/

Why Groovy

• Leverage existing Java API knowledge
• Integrate closely with production Java code
• Expressive language & libraries
• Just a 5MB jar on the classpath

Groovy Support in Cucumber

• Cuke4Duke
• Uses JRuby behind the scenes
o Pure Java coming later this year
• Groovy DSL to automate scenarios

https://github.com/aslakhellesoy/cuke4duke

Feature

Scenario: Regular numbers
Given I have entered 3
And I have entered 2
When I press divide
Then the result should be 1.5

https://github.com/aslakhellesoy/cuke4duke/tree/master/examples/groovy

Given

Given(~'I have entered (.*)') { number ->
calculator.push number
}

// Implicit coercion to integer
Given(~'I have entered (.*)') { int number ->
assert number.class == Integer.class
calculator.push number
}

When

When(~'I press (w+)') { operatorName ->
result = calculator."$operatorName"()
}

// Can use slashy strings to avoid escaping
When(/I press (w+)/) { operatorName ->
result = calculator."$operatorName"()
}

Then

Then(~'the result should be (.*)') {
double result ->
assert expected == result
}

// == compares equality
// not same instance as in Java

Power Assert

def now = new Date()
def old = Date.parse('yyyyMMdd', '20100101')
assert now.date == old.date

Assertion failed:

assert now.date == old.date
| | | | |
| 19 | | 1
| | Fri Jan 01 00:00:00 GMT 2010
| false
Sat Mar 19 13:18:42 GMT 2011

Multiline Strings

Given some text
"""
Line 1
Line 2
"""

Given(~'some text') { body ->
body.eachLine {
println it
}
}

=> Line 1
=> Line 2

Tables

Given(~'I have the following foods') { table ->
basket = new Basket()
table.hashes().each {
def item = new Food(
name: it.name, // it.get('name')
healthy: it.healthy == 'Yes')
basket.add(item)
}
}
When(~'I count the healthy items') {
numberOfHealthy = basket.numberOfHealthy
}
Then(~'I have (.+) healthy items') { int count ->
assert numberOfHealthy == count
}

Tables

class Basket {
private items = []
void add(item) {
items << item
}
int getNumberOfHealthy() {
items.findAll {
it.healthy
}.size()
}
}

class Food {
def name
def healthy
}

Organising Step Definitions

Cucumber will read in any .groovy files within step_definitions

All steps are then available to any scenarios

State can be shared between steps by setting to script binding

When(~'I set a variable to the binding') {
x = 1
}
Then(~'the other step can access variable') {
assert x == 1
}

Before/After

Before {
// Initialise something
}

Before('@tagname') {
// Initialise only for features/scenarios
// tagged with @tagname
}
Before('~@tagname') {} // not tagged

After {
// Clean up something
}

World

Allow simple access to methods from within step definitions

World {
def world = new Object()
world.metaClass.mixin Math
world
}

When(~'we take the square root') {
sqrt(4) // calls Math.sqrt(4)
}

Browser Automation with Geb

Given(~'I am on the Wikipedia homepage') {
go()
}

When(~'I search for "(.+)"') { query ->
$('#searchInput').value(query)
$('.searchButton').click()
}

Then(~'I am shown the "(.+)" article') { article ->
assert $('h1').text() == article
}

env.groovy for Geb

import geb.Browser
this.metaClass.mixin(cuke4duke.GroovyDsl)

World {
new Browser('http://wikipedia.org')
}

After {
clearCookies()
}

Build Tools

Integration with
• Maven
• Ant

Cucumber can write reports in JUnit format for CI reports

Discussion/Questions

Thanks!

http://rapaul.com @rapaul

Cucumber on the JVM with Groovy

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